High Security Labs Secure DP-DP KVM and Mini-Matrix Security Target
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High Security Labs Secure DP-DP KVM and Matrix
Security Target
Release Date: October 4, 2018
Document ID: HDC15773
Revision: G
Prepared By: Zohar Vered, High Security Labs ltd
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Contents
1 Introduction .........................................................................................................................................6
1.1 Document Organization................................................................................................................6
1.2 ST and TOE Identification..............................................................................................................7
1.3 PP Identification............................................................................................................................7
1.4 Document Terminology ................................................................................................................8
1.4.1 ST Specific Terminology ........................................................................................................8
1.4.2 Acronyms ..............................................................................................................................9
1.5 TOE Overview..............................................................................................................................11
1.5.1 TOE Description...................................................................................................................11
1.5.2 High Level TOE Architecture ...............................................................................................12
1.5.3 KVMs TOE Details................................................................................................................14
1.6 Physical Scope and Boundary .....................................................................................................23
1.6.1 Overview .............................................................................................................................23
1.6.2 Evaluated Environment.......................................................................................................23
1.7 Guidance Documents..................................................................................................................24
1.8 TOE Features Outside of Evaluation Scope.................................................................................25
1.9 Document Conventions ..............................................................................................................26
2 Conformance Claims ..........................................................................................................................27
2.1 Common Criteria Conformance Claims.......................................................................................27
2.2 Protection Profile (PP) Claims.....................................................................................................28
2.3 Package Claims............................................................................................................................28
3 Security Problem Definition ...............................................................................................................29
3.1 Secure Usage Assumptions.........................................................................................................29
3.2 Threats ........................................................................................................................................29
3.2.1 Threats Addressed by the TOE............................................................................................30
3.2.2 Threats addressed by the IT Operating Environment.........................................................31
3.3 Organizational Security Policies..................................................................................................31
4 Security Objectives.............................................................................................................................32
4.1 Security Objectives for the TOE ..................................................................................................32
4.2 Security Objectives for the Operational Environment................................................................36
4.3 Rationale.....................................................................................................................................38
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4.3.1 TOE Security Objectives Rationale......................................................................................41
4.3.2 Security Objectives Rationale for the Operational Environment .......................................56
4.4 Rationale for Organizational Policy Coverage.............................................................................57
5 Extended Components Definition......................................................................................................58
5.1 Family FTA_CIN_EXT: Continuous Indications ............................................................................58
5.2 Class FTA_ATH_EXT: User Authentication Device Reset and Termination.................................59
6 Security Requirements.......................................................................................................................61
6.1 Security Functional Requirements for the TOE...........................................................................61
6.1.1 Overview .............................................................................................................................61
6.1.2 Class: User Data Protection (FDP).......................................................................................62
6.1.3 Data Isolation Requirements ..............................................................................................64
6.1.4 Class: Protection of the TSF (FPT) .......................................................................................70
6.1.4.1 Passive Detection ................................................................................................................70
6.1.5 Resistance to Physical Attack..............................................................................................70
6.1.6 TOE Access (FTA_CIN_EXT) .................................................................................................71
6.1.7 F.1.2 Class: Security Audit (FAU).........................................................................................72
6.1.8 F.1.3 Class: Identification and authentication (FIA)............................................................72
6.1.9 Residual Information Protection (FDP_RIP)........................................................................73
6.1.10 F.2.1 Class: Security Management (FMT) ...........................................................................73
6.1.11 G.1 - Class FTA_ATH_EXT: User Authentication Device Reset and Termination ................75
6.2 Rationale For TOE Security Requirements..................................................................................76
6.2.1 TOE Security Functional Requirements Tracing & Rationale..............................................76
6.3 Rationale for IT Security Requirement Dependencies................................................................85
6.4 Dependencies Not Met...............................................................................................................87
6.4.1 FMT_MSA.3 - Static attribute initialization.........................................................................87
6.4.2 FMT_MSA.3(1) and FMT_MSA.3(3) - Static attribute initialization ....................................87
6.5 Security Assurance Requirements ..............................................................................................88
7 TOE Summary Specification ...............................................................................................................89
7.1 TOE keyboard and mouse security functions .............................................................................89
7.2 TOE external interface security functions...................................................................................91
7.3 TOE Audio Subsystem security functions....................................................................................93
7.4 TOE video subsystem security functions ....................................................................................94
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7.5 TOE User authentication device subsystem security functions..................................................98
7.6 TOE User control and monitoring security functions ...............................................................100
7.7 TOE Tampering protection........................................................................................................101
7.8 TOE Self-testing and Log ...........................................................................................................102
7.9 The TOE Administrator Access mechanism ..............................................................................104
Annex A – HSL Model Numbering.............................................................................................................105
Annex B – Tests to Specific TOE models mapping ....................................................................................106
Annex C – Letter of Volatility................................................................................................................108
Annex D – Letter of Declaration – Spectre / Meltdown Vulnerability..................................................110
Annex E – Tamper Evident Label ..........................................................................................................111
Table of Figures
Figure 1 – Simplified block-diagram of 2-Port KVM TOE ............................................................................12
Figure 2 – Typical example of KVM TOE installation ..................................................................................13
Figure 3 - Secure KVM Switch TOE external interfaces diagram ................................................................18
Figure 4 – Dual-Head or Mini-Matrix Secure KVM Switch TOE external interfaces diagram.....................20
Figure 5 - FTA_CIN_EXT.1: Continuous Indications.....................................................................................59
Figure 6 - FTA_ATH_EXT: User authentication device reset and termination............................................60
Figure 7 – Simplified block diagram of 2-Port KVM TOE.............................................................................89
Figure 8 – Block diagram of KVM TOE video sub-system during display EDID read...................................95
Figure 9 – Block diagram of KVM TOE video sub-system during display EDID write..................................96
Figure 10 – Block diagram of KVM TOE video sub-system during normal mode .......................................97
Figure 11 – HSL Secure products model numbering.................................................................................105
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List of Tables
Table 1 – ST identification.............................................................................................................................7
Table 2 - ST Specific Terminology .................................................................................................................9
Table 3 - Acronyms......................................................................................................................................11
Table 4 – Secure KVM and Matrix TOE identification.................................................................................14
Table 5 – Peripheral Devices supported by the KVM TOE..........................................................................15
Table 6 – Protocols supported by the KVM TOE Console Ports..................................................................16
Table 7 – Protocols supported by the KVM TOE Computer Ports ..............................................................17
Table 8 – KVM TOE features and services...................................................................................................21
Table 9 - Evaluated TOE and Environment Components............................................................................24
Table 10 – Secure usage assumptions ........................................................................................................29
Table 11 – Threats addressed by the TOEs.................................................................................................31
Table 12 - TOE Security Objectives definitions (derived from the PP) .......................................................36
Table 13 - Operational Environment Security Objectives (from the PP) ....................................................37
Table 14 - Sufficiency of Security Objectives ..............................................................................................39
Table 15 – TOE Security Objectives rationale.............................................................................................55
Table 16 – Operational Environment Security Objectives rationale ..........................................................57
Table 17 - Extended SFR Components........................................................................................................58
Table 18 - TOE Security Functional Requirements summary......................................................................62
Table 19- SFR and Security Objectives Mapping with TOE compliance requirements...............................77
Table 20 - Objective to SFRs Rationale .......................................................................................................85
Table 21 - SFR Dependencies satisfied........................................................................................................87
Table 22 - SAR list........................................................................................................................................88
Table 23 - Authorized peripheral devices (derived from referenced PP table 12).....................................93
Table 24 - PP Tests to Test Setups ............................................................................................................107
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1 Introduction
This section identifies the Security Target (ST), Target of Evaluation (TOE), conformance claims, ST
organization, document conventions, and terminology. It also includes an overview of the evaluated
product.
An ST principally defines:
• A security problem expressed as a set of assumptions about the security aspects of the
environment; a list of threats which the product is intended to counter; and any known rules
with which the product must comply (in Chapter 3, Security Problem Definition).
• A set of security objectives and a set of security requirements to address that problem (in
Chapters 4 and 5, Security Objectives and IT Security Requirements, respectively).
• The IT security functions provided by the Target of Evaluation (TOE) that meet the set of
requirements (in Chapter 6, TOE Summary Specification).
The structure and content of this ST complies with the requirements specified in the Common Criteria
(CC), Part 1, Annex A, and Part 3, Chapter 6.
1.1 Document Organization
Security Target Introduction (Section 1)
Section 1 provides identification of the TOE and ST, an overview of the TOE, an overview of the content
of the ST, document conventions, and relevant terminology. The introduction also provides a description
of the TOE security functions as well as the physical and logical boundaries for the TOE, the hardware
and software that make up the TOE, and the physical and logical boundaries of the TOE.
Conformance Claims (Section 2)
Section 2 provides applicable Common Criteria (CC) conformance claims, Protection Profile (PP)
conformance claims and Assurance Package conformance claims.
Security Problem Definition (Section 3)
Section 3 describes the threats, organizational security policies, and assumptions pertaining to the TOE
and the TOE environment.
Security Objectives (Section 4)
Section 4 identifies the security objectives for the TOE and its supporting environment as well as a
rationale describing how objectives are sufficient to counter the threats identified for the TOE.
Extended Components Definition (Section 5)
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Section 5 presents the components needed for the ST but not present in Part II or Part III of the
Common Criteria Standard.
Security Requirements (Section 6)
Section 6 presents the Security Functional Requirements (SFRs) met by the TOE, and the security
functional requirements rationale. In addition, this section presents Security Assurance Requirements
(SARs) met by the TOE, as well as the assurance requirements rationale.
Summary Specification (Section 7)
This section describes the security functions provided by the TOE and how they satisfy the security
functional requirements. It also describes the security assurance measures for the TOE and the rationale
for the assurance measures.
1.2 ST and TOE Identification
This section provides information needed to identify and control this ST and its Target of Evaluation
(TOE), the TOE Name.
ST Title High Security Labs Secure DP-DP KVM and Mini-Matrix Security Target
ST Evaluation by EWA Canada
Revision Number G
ST Publish Date October 04, 2018
ST Authors Zohar Vered, High Security Labs ltd
TOE Identification See tables 2 below
Keywords KVM, Secure, Isolator, HSL, High Sec Labs, Protection Profile 3.0, Mini-
Matrix, DisplayPort
Table 1 – ST identification
1.3 PP Identification
Validated Protection Profile – NIAP Peripheral Sharing Switch for Human Interface Devices Protection
Profile, Version 3.0, February 13, 2015.
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1.4 Document Terminology
Please refer to CC Part 1 Section 4 for definitions of commonly used CC terms.
1.4.1 ST Specific Terminology
Administrator A person who administers (e.g. installs, configures, updates, maintains) a
system of device(s) and connections.
Configurable Device
Filtration (CDF)
PSS function that qualifies (accepts or rejects) peripheral devices based on
field configurable parameters.
Connected Computer A computing device (platform) connected to the PSS. May be a personal
computer, server, tablet or any other computing device with user
interaction interfaces.
Connection Enables devices to interact through respective interfaces. It may consist of
one or more physical (e.g. a cable) and/or logical (e.g. a protocol)
components.
Device An information technology product with which actors (persons or devices)
interact.
Display A Human Interface Device (HID), such as a monitor or touchscreen, which
displays user data.
External Entity An entity outside the TOE evaluated system, its connected computers and
its connected peripheral devices.
Fixed Device
Filtration (FDF)
PSS function that qualifies (accepts or rejects) peripheral devices based on
fixed parameters.
Human Interface
Device (HID)
A device that allows for user input. For example, keyboard and mouse.
Interface Enables interactions between actors.
Isolator A PSS with a single connected computer.
Keyboard A Human Interface Device (HID) such as a keyboard, keypad or other text
entry device.
KM A PSS that switches only the keyboard and pointing device.
Non-Selected
Computer
A connected computer not currently selected by the PSS user.
Peripheral A device that exposes an actor’s interface to another actor.
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Peripheral Group An ordered set of peripherals.
Pointing Device A Human Interface Device (HID), such as a mouse, track ball or touch
screen (including multi-touch).
Remote Desktop
Controller (RDC)
Device connected to the TOE with a cable that enables remote user to
control and monitor the TOE.
Selected Computer A connected computer currently selected by the PSS user.
User A person or device that interacts with devices and connections.
User Authentication
Device
A peripheral device used to authenticate the identity of the user, such as a
smart-card reader, biometric authentication device or proximity card
reader.
Video Wall Consists of multiple computer monitors, video projectors, or television sets
tiled together contiguously or overlapped in order to form one large
display.
Table 2 - ST Specific Terminology
1.4.2 Acronyms
Acronym Meaning
AUX DisplayPort Auxiliary Channel
CAC Common Access Card
CCID Chip Card Interface Device (USB Organization standard)
CCTL Common Criteria Test Lab
CDC Communication Device Class
CODEC Coder-Decoder
dBv A measurement of voltages ratio – decibel volt
DC Direct Current
DP DisplayPort
DVI Digital Visual Interface
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EDID Extended Display Identification Data
FDF Fixed Device Filtration
HDMI High Definition Multimedia Interface
HEAC HDMI Ethernet Audio Control
HID Human Interface Device
HSL High Sec Labs (the manufacturer of the TOE)
IP Internet Protocol
USB Keep-Alive NAK
transaction
USB 2.0 standard handshake PID (1010B) – Receiving device cannot
accept data or transmitting device cannot send data.
KM Keyboard, Mouse
KVM Keyboard, Video and Mouse
LED Light-Emitting Diode
LoS Line-of-Sight
MCCS Monitor Control Command Set
MHL Mobile High-Definition Link
MSC Mass Storage Class
mV millivolt
OSD On-Screen Display
PC Personal Computer
PIN Personal Identification Number
PSS Peripheral Sharing Switch
S/PDIF Sony/Philips Digital Interface Format
SP Special Publication
SPF Shared Peripheral Functions
TMDS Transition-Minimized Differential Signaling
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UART Universal Asynchronous Receiver / Transmitter
USB Universal Serial Bus
V Volt
VESA Video Electronics Standards Association
VGA Video Graphics Array
Table 3 - Acronyms
1.5 TOE Overview
1.5.1 TOE Description
This section provides context for the TOE evaluation by identifying the logical and physical scope of the
TOE.
The TOE is a KVM switch device classified as a “Peripheral Sharing Switch” for Common Criteria. The TOE
includes both hardware and firmware components.
It should be noted that modern Secure KVM devices do not allow any electrical interface peripheral
sharing in order to prevent certain attacks, and therefore they are no longer simple switching devices.
The TOE is a peripheral sharing switch.
The physical boundary of the TOE consists of:
• One HSL Secure KVM Switch or KVM Matrix Switch;
• The firmware embedded inside the TOE that is permanently programmed into the TOE multiple
microcontrollers;
• The TOE power supply that is shipped with the product;
• The TOE COMPUTER interface cables that are shipped with the product;
• The accompanying User Guidance. Updated User Guidance can be downloaded from the
http://www.highseclabs.com website at any time.
The evaluated TOE configuration does not include any peripherals or computer components, but do
include supplied computer interface cables and a Remote Desktop Controller attached to the TOE.
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1.5.2 High Level TOE Architecture
The High Sec Labs Secure Peripheral Sharing Switches (PSS) allows the secure sharing of a single set of
peripheral components such as keyboard, Video Display and Mouse/Pointing devices among multiple
computers through standard USB, HDMI, and DisplayPort interfaces.
The High Sec Labs third-generation Secure PSS product uses multiple isolated microcontrollers (one
microcontroller per connected computer) to emulate the connected peripherals in order to prevent
various methods of attacks such as: display signaling, keyboard signaling, power signaling etc. Figure 1
below show a simplified block diagram of the TOE keyboard and mouse data path. Full-time Host
Emulator (HE) communicates with the user keyboard through bi-directional protocols such as USB. Host
Emulator converts the user key-strokes into unidirectional serial data. That unidirectional serial data is
passed through the data switch that selects between computer A and computer B based on the user
channel selection. Isolated Device Emulators (DE) are connected to the data switch on one side and to
their respective computers on the other side. Each key-stroke is converted by the selected DE into a bi-
directional stream such as USB to communicate with the computer.
The products are also equipped with multiple unidirectional flow forcing devices to assure adherence to
the organizational confidentiality policy through strict isolation of connected computers.
Figure 1 – Simplified block-diagram of 2-Port KVM TOE
The High Sec Labs Secure PSS product lines are available in 2, 4 or 8 ports models with single or dual-
head (displays). Products include traditional KVM switching devices, as well as KVM matrix products.
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The High Sec Labs Secure PSS works with standard Personal Computers, portable computers, servers or
thin-clients. Connected computers usually running operating systems such as Windows or Linux and
have ports for USB keyboard, USB mouse, DVI video, HDMI video, DisplayPort video, audio (input and
output), and USB Common Access Card (CAC) or Smart-Card reader.
The TOE is intended to be used in a range of security settings (i.e. computers coupled to a single TOE can
vary from non-classified Internet connected to those protected in accordance with national security
policy). Any data leakage across the TOE may cause severe damage to the organization and therefore
must be prevented.
Unlike older Secure PSS security schemes that mostly protected user information transitioning through
the TOE, the modern approach primarily addresses the risk of TOE compromise through remote attacks
to coupled networks which could leak any user information across different networks.
A summary of the High Sec Labs Secure PSS security features can be found below. A detailed description
of the TOE security features and how it is mapped to the claimed PP SFRs, can be found in Section 7, TOE
Summary Specification.
Figure 2 – Typical example of KVM TOE installation
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1.5.3 KVMs TOE Details
1.5.3.1 Evaluated KVM Products
Model P/N Description Eval. Version
4-Port
SK41PPU-3 CGA15441 Secure SH KVM Switch 4-Port DisplayPort to DisplayPort 4K video, with
fUSB, PP 3.0
33303-C6C6
DK42PHU-3 CGA15781 Secure DH KVM Switch 4-Port DP/HDMI to DP/HDMI 4K video, with fUSB,
PP 3.0
33303-C6C6
DK42PPU-3 CGA15487 Secure DH KVM Switch 4-Port DisplayPort to DisplayPort 4K video, with
fUSB, PP 3.0
33303-C6C6
SX42PU-3 CGA10144 Secure SH Mini-Matrix KVM 4-Port DisplayPort video, w/fUSB, PP 3.0 33303-C6C6
8-Port
SK81PPU-3 CGA15783 Secure SH KVM Switch 8-Port DisplayPort to DisplayPort 4K video, PP 3.0 33303-C6C6
DK82PPU-3 CGA15784 Secure DH KVM Switch 8-Port DisplayPort to DisplayPort 4K video, PP 3.0 33303-C6C6
SX82PU-3 CGA15413 Secure SH Mini-Matrix KVM 8-Port DP to DP video, w/fUSB, PP 3.0 33303-C6C6
Table 4 – Secure KVM and Matrix TOE identification
Notes:
(1) fUSB = Filtered USB port (having Configurable Device Filtration - CDF).
(2) SH = Single Head, DH = Dual Head.
(3) Mini-matrix and Dual-head TOE are considered KVM.
(4) All products listed above are having USB 1.0 / 2.0 interfaces for peripheral devices. The USB
interfaces support Low speed, Fast and high-speed USB protocols.
(5) See Appendix A for details about HSL model numbering.
1.5.3.2 Common Criteria Product type
The KVM TOE is a device classified as a “Peripheral Sharing Switch” for Common Criteria. The TOE
includes both hardware and firmware components.
HSL KVM TOE is satisfying the referenced PP Annex B Use Case 1.
1.5.3.3 Peripheral Device Supported by the KVM TOE
The peripheral devices that supported by the KVM TOE are listed in the following table.
Console Port Authorized Devices
Keyboard 1. Any wired keyboard and keypad without internal USB hub or composite device functions;
2. USB to PS/2 adapter; and
3. Barcode reader.
Mouse /
Pointing device
1. Any wired mouse, or trackball without internal USB hub or composite device functions.
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2. Touch-screen;
3. Multi-touch or digitizer;
Audio out 1. Analog amplified speakers;
2. Analog headphones;
3. Digital audio appliance.
Display 1. Display;
2. Projector;
User
authentication
device
1. Smartcard, CAC reader;
2. Token;
3. Biometric reader;
4. Any other qualified device if PSS supports configurable user authentication device filtering.
5. PSS internal function listed above.
Table 5 – Peripheral Devices supported by the KVM TOE
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1.5.3.4 Protocols supported by the KVM TOE
The following table maps the TOE covered by this ST to the protocols supported.
First table (table 4) identifies the TOE console interface protocols supported. The second table below
(table 5) identifies the TOE computer (host) interface protocols supported.
Model Console
Keyboard
Console
Mouse
Console
Audio
Console Display Console DPP
USB
1.1/2.0
USB
1.1/2.0
Analog
stereo
output
DVI-I DP HDMI USB 1.1/2.0
4-Port
SK41PPU-3 ● ● ● ● ●
DK42PHU-3 ● ● ● ● ● ●
DK42PPU-3 ● ● ● ● ●
SX42PU-3 ● ● ● ● ●
8-Port
SK81PPU-3 ● ● ● ● ●
DK82PPU-3 ● ● ● ● ●
SX82PU-3 ● ● ● ● ●
Table 6 – Protocols supported by the KVM TOE Console Ports
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Model Host Keyboard
and Host Mouse
Host Audio Host Display Output Host DPP
USB 1.1/2.0 Analog
stereo input
DVI-I DP HDMI USB 1.1/2.0
4-Port
SK41PPU-3 ● ● ● ●
DK42PHU-3 ● ● ● ● ●
DK42PPU-3 ● ● ● ●
SX42PU-3 ● ● ● ●
8-Port
SK81PPU-3 ● ● ● ●
DK82PPU-3 ● ● ● ●
SX82PU-3 ● ● ● ●
Table 7 – Protocols supported by the KVM TOE Computer Ports
1.5.3.5 KVM TOE and Environment Components
The following paragraphs describe the various KVM TOE type typical operational environment and
external interfaces.
It should be noted that although in most figures below four host computer channels are shown, TOE
may have two, four or eight channels depending on product derivative. KVM TOE also may support a
single display, multiple displays or multiple displays through video matrix.
Figure 3 illustrates a high-level block diagram of the TOE system 1a showing 4-channels Secure HDMI or
DP KVM TOE 5a, coupled to four host computers 6a to 6d typically coupled to four isolated networks
(not shown here) and coupled to the user console devices 3, 4, 66 and 40.
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Figure 3 - Secure KVM Switch TOE external interfaces diagram
User console devices illustrated here and in the next figures are:
• User display 2 coupled to TOE peripheral interface video output 17;
• User headphones or amplified speakers 66 coupled to TOE peripheral interface audio out 67;
• User USB keyboard 3 coupled to TOE keyboard peripheral interfaces 314;
• User USB mouse 4 coupled to TOE pointing-device peripheral interfaces 314;
• User USB authentication device or other defined USB device 40 coupled to TOE dedicated
peripheral port device interface 44;
This KVM TOE 5a functions as a conventional switch that allows a single user to interact with one of the
four coupled computers 6a to 6d through selection made with TOE front panel pushbuttons 19a to 19d
respectively. This KVM TOE supports a single user display 2 through switching function to display only
one user selected channel at a time.
KVM TOE Computer interface cables (some sown in figure 3 above) are special cables supplied with the
TOE. Video cables 7x and 8x are coupled to the TOE computer video interface port 12x respectively.
Keyboard and mouse USB cables 13x are coupled to the TOE KM computer interface ports 15x
respectively. Additional USB DPP cables (not shown in the figure above) are coupled to the TOE DPP
computer interface ports 60x.
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Any one of the connected computers 6x may be used to access user configuration and administrator
configuration mode through simple text editor. User or administrator can interact with the TOE through
keyboard 3, mouse 4 and display 2. In addition, keyboard 3 may be used to enter various TOE
operational settings using keyboard shortcuts. These shortcuts are defined in the appropriate user
guidance documentation.
External AC/DC wall mounted power supply 16 is coupled to the TOE DC power jack 9 to provide power.
It should be noted that some TOE (4-Port and higher) are having internal AC/DC power supply and
therefore in these TOE AC cable is connected to AC power jack at the TOE rear panel.
The 8 port KVM TOE models are all sharing the same internal modules – these TOEs are having
respectively:
• A single instance of 8-Port DisplayPort video board;
• Two instances of 8-port DisplayPort video boards connected in parallel
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Dual-head or Mini-Matrix KVM TOE
Figure 4 illustrates a high-level block diagram of the KVM TOE system 1d showing four-channels Dual-
Head or Mini-Matrix Secure KVM Switch TOE 5d, coupled to four host computers 6a to 6d that are
typically coupled to four isolated networks (not shown here) and coupled to the user console devices 2p,
2s, 3, 4, 66 and 40.
Figure 4 – Dual-Head or Mini-Matrix Secure KVM Switch TOE external interfaces diagram
This TOE functions as a keyboard and mouse switch that allows a single user to interact with one of the
four coupled computers 6a to 6d through selection made with push buttons 19a to 19d respectively. In
this TOE each coupled host computer 6a to 6d is capable of driving two user displays 2p (primary
display) and 2s (secondary display). TOE 5d switches the two video outputs of each host computer into
the two user displays 2p and 2s synchronously with the keyboard 3, mouse 4, User authentication device
reader 40 and headset 66.
1.5.3.6 Logical Scope of the KVM TOE
As the TOE is a peripheral sharing switch and is subject to the evaluation under “NIAP Peripheral Sharing
Switch for Human Interface Devices Protection Profile, Version 3.0, February 13, 2015” the logical scope
of the evaluation will include:
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• Security Audits – The TOE will maintain a log of the administrator actions with date and time
performed.
• User Data Protection – The TOE will isolate and separate the user data between the different
connected computers and the attached peripherals.
• Administrator Access – The TOE will allow administrator’s access to perform certain
administrator’s tasks. The administrator must logon based on the criteria defined in the PP.
• Security Management – The TOE supports certain advanced settings for example white list and
black list to be connected via the fUSB, reset to factory defaults and more. Those setting will be
limited to logged on administrator as defined in the PP.
• Protection of TSF - TOE runs self-tests on startup, provides resistance to physical attacks and
provides an indication of physical tampering.
1.5.3.6.1 Basic KVM TOE Functions Overview
Secure KVMs are used to enable a single user having a single set of peripherals to operate in an
environment having multiple isolated computers. KVM switches keyboard, mouse, display, audio, and
other peripheral devices to one user selected computer.
The following table provides the various KVM TOE features and services that were verified in the current
evaluation.
No. Function / Service provided by the KVM TOE
1. Mapping user display to selected computer
2. Mapping user keyboard and mouse to selected computer
3. Mapping user audio device to selected computer
4. Isolating source computer from user peripherals
5. Mapping user USB peripheral device to selected computer
6. Freeze user USB device to one channel
7. Freeze user audio device to selected computer
8. Administrator access to management, configuration and log functions
9. Cursor tracking switching functions
10. Restore factory defaults function
Table 8 – KVM TOE features and services
1.5.3.6.2 Administrative and User configuration of the KVM TOE
The KVM TOE enable user configuration of various operational parameters. This access may be
performed using one of the following methods (as further explained in the relevant TOE user guidance):
1. Using predefined keyboard shortcuts;
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2. Using connected computer and text editor application; and
3. Using special USB configuration loading cable and special configuration utility
software.
The KVM TOE enable identified and authenticated administrator’s configuration of various operational
and security parameters. Multiple administrators are supported by this TOE. Access requires user name
and password authentication. This access may be performed using one of the following methods (as
further explained in the relevant TOE administrator guidance):
1. Using connected computer and text editor application; and
2. Using special USB configuration loading cable and special configuration utility
software.
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1.6 Physical Scope and Boundary
1.6.1 Overview
The TOE is a peripheral sharing switch that is configured as KVM or Mini-Matrix.
The physical boundary of the TOE consists of:
• One HSL Secure KVM Switch or Matrix; Typically (but not necessarily) made internally of system
controller board and video board (refer to table 2 above for model and hardware version);
• The firmware embedded inside the TOE that is permanently programmed into the TOE multiple
microcontrollers (refer to table 2 above for firmware version);
• The log, state and settings data stored in the TOE;
• The TOE power supply that is shipped with the product (or integrated inside some of the
products having 4 ports or more);
• The TOE computer interface cables that are shipped with the product (refer to table 8 below);
• The accompanying User Guidance and Administrator Guidance can be downloaded from High
Sec Labs website: http://highseclabs.com/page/?pid=23 at any time.
The evaluated TOE configuration does not include any peripherals or computer components but do
include supplied computer interface cables attached to the TOE. Figures 1 and 2 above and table 8
below depicts the TOE and its typical installation environment.
It should be noted that some TOE models support multiple instances of the same peripheral for example
Dual Head KVM and Matrix TOE models that support two or more instances of user displays.
It also should be noted that some TOE models support only a partial set of peripheral devices. For
example, some KVM TOE models do not support user authentication devices (parts are not populated
on the board).
1.6.2 Evaluated Environment
This table identifies hardware components and indicates whether or not each component is in the TOE
or Environment.
TOE / Environment Component Description
TOE Selectable product from table 2 above. TOE Hardware
and firmware
Environment Standard USB Console USB
user mouse port
Environment Standard USB Console USB
user keyboard
port
Environment Standard USB User Authentication Device.
Any other predefined USB device based on the Configurable Device
Filtration (CDF) settings.
Console user
authentication
device interface
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Environment Standard computer display (VGA, DVI, HDMI, DisplayPort depending on
TOE product)
Console user
display interface
TOE HSL KVM Cables (as needed):
P/N Description
CWR05117 KVM Cable short (1.8 m), USB Type-A to
USB Type-B, Black
CWR05116 KVM Cable short (1.8 m), Audio out, DPP,
Black
CWR05205 KVM Cable short (1.8 m), DVI-A to VGA,
USB, Black
CWR05114 KVM Cable short (1.8 m), DVI-D to DVI-D
Single-Link, USB, Black
CWR05115 KVM Cable short (1.8 m), USB Type-C to
USB Type-C, Black
HWR08154 KVM Cable short (1.8m), HDMI to HDMI,
USB, Black
CWR06246 KVM Cable short (1.8 m), DP to DP, USB A
to USB B, Black
Cables for
connection of
computers to
TOE computers
TOE
Special Administrator Configuration Loading Cable (as needed):
P/N Description
HWR06579 HSL USB Type-A to USB Type-A
Configuration Loading Cable, 1.8m, Black
USB-A to USB-A
Configuration
Loading Cable
Environment
Standard amplified stereo speakers or analog headphones Audio output
console port
Environment Standard PC, Server, portable computer, tablet, thin-client or zero-
client running any operating system;
Connected
computers
Table 9 - Evaluated TOE and Environment Components
1.7 Guidance Documents
The following guidance documents are provided with the TOE upon delivery in accordance with PP:
• HighSecLabs Quick Installation Guide 2/4/8 Ports High Security Single-Head DP-DP KVM
Switches, HD15898, Rev 1.2, May 2018
• HighSecLabs Quick Installation Guide 2/4/8 Ports High Security Dual-Head DP-DP KVM
Switches, HD15899, Rev 1.2, May 2018
• HighSecLabs Quick Installation Guide 2/4/8 Ports High Security DP-DP Mini-Matrix KVM
Switches, HD15915, Rev 1.3, May 2018
HSL Administrator Guide, Doc No.: HDC10956, Rev D, May 2018 All documentation delivered with the
product or available for download from HSL web-site is relevant to and within the scope of the TOE – for
additional information see paragraph 1.4.1 above.
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1.8 TOE Features Outside of Evaluation Scope
This section identifies any items that are specifically excluded from the TOE.

 TOE cable connected remote control unit or control computer that provides user monitoring
and control of the TOE from remote locations – device called Remote Desktop Controllers (RDC)
is not covered by this evaluation.

 USB Configuration Utility (UCU) software used with some models to configure the fUSB,
Dedicated Peripheral Port (DPP) filtration parameters.
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1.9 Document Conventions
The CC defines four operations on security functional requirements. The descriptions below
define the conventions used in this ST to identify these operations. When NIAP interpretations
are included in requirements, the additions from the interpretations are displayed as
refinements.
Assignment: indicated with bold text
Selection: indicated with underlined text
Note that this ST follows the conventions used in the referenced PP regarding selection based SFRs and
therefore only requirements appearing in Annex G of the PP are underlined.
Blue fonts are used in this document to indicate text, paragraph or SFR that may be applicable or not
applicable for specific TOE product.
Refinement: additions indicated with bold text and italics deletions indicated with strike-through
bold text and italics
Iteration: indicated with typical CC requirement naming followed by a lower case letter for each
iteration (e.g., FMT_MSA.1a)
Extended: indicated as per the applicable PP (e.g. FTA_CIN_EXT.1)
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2 Conformance Claims
This section describes the conformance claims of this Security Target.
2.1 Common Criteria Conformance Claims
The Security Target is based upon:
1. Common Criteria for Information Technology Security Evaluation, CCMB-2017-04-001, Version
3.1, revision 4, September 2012. Part 1: Introduction and general model.
2. Common Criteria for Information Technology Security Evaluation, CCMB-2017-04-002, Version
3.1, revision 4, September 2012. Part 2: Functional security components.
3. Common Criteria for Information Technology Security Evaluation, CCMB-2017-04-003, Version
3.1, revision 4, September 2012. Part 3: Assurance security components.
4. Common Methodology for Information Technology Security Evaluation, Evaluation
Methodology, CCMB-2017-04-004, Version 3.1, revision 4, September 2012.
This Security Target claims the following CC conformance:
• Part 2 extended
• Part 3 conformant
This ST strictly conforms to the requirements of PP – all PP requirements are met. This ST is an
instantiation of the PP. The TOE covered in this ST demonstrates Exact Compliance with the PP. This ST
contains all of the requirements in section 4 of the PP as well as some requirements from Annex F and
Annex G of the PP. No additional requirements (from the CC parts 2 or 3) were added in this ST. Further,
no requirements in section 4 of the PP are omitted from this ST.
With respect to assurance, this ST contains the exact assurance requirements defined in the PP.
Furthermore, all applicable assurance activities stated in the PP were performed.
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2.2 Protection Profile (PP) Claims
This ST claims exact conformance to the following PP:
Protection Profile: Peripheral Sharing Switch Protection Profile
Version: 3.0 dated Feb 13, 2015.
Technical decisions:
TD0298 Update to FDP_IFF.1 Assurance Activities
TD0251 FMT_MOF.1.1 - Added Assignment
TD0144 FDP_RIP.1.1 - Purge Memory and Restore Factory Defaults Optional
TD0136 FDP_RIP.1.1 - Refinement
TD0086 DisplayPort to HDMI Conversion Functionality
TD0083 Vulnerability Survey Assurance Component (AVA_VAN.1) in PSS PP v3.0
2.3 Package Claims
Package Claims are not part of the referenced PP.
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3 Security Problem Definition
This section describes assumptions about the operational environment in which the TOE is intended to
be used and represents the conditions for the secure operation of the TOE.
Note: The content in this section is appears in the Security Problem Definition of the claimed PSS PP and
is copied here for completeness.
3.1 Secure Usage Assumptions
The Security Objectives and Security Functional Requirements defined in subsequent sections
of this Security Target are based on the condition that all of the assumptions described in this
section are satisfied.
Assumption Definition
A.NO_TEMPEST It is assumed that the computers and peripheral devices
connected to the TOE are not TEMPEST approved.
A.NO_SPECIAL_ANALOG_CAPABILITIES It is assumed that the computers connected to the TOE are
not equipped with special analog data collection cards or
peripherals such as: Analog to digital interface, high
performance audio interface, Digital Signal Processing
function, and analog video capture function.
A.PHYSICAL Physical security, commensurate with the value of the TOE
and the data it contains, is assumed to be provided by the
environment.
A.TRUSTED_ADMIN TOE Administrators and users are trusted to follow and apply
all guidance in a trusted manner.
A.TRUSTED_CONFIG Personnel configuring the TOE and its operational
environment will follow the applicable security configuration
guidance.
Table 10 – Secure usage assumptions
3.2 Threats
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3.2.1 Threats Addressed by the TOE
“Threats to Security” Section 2 of the claimed Protection Profile identifies the following threats to the
assets against which specific protection within the TOE is required:
Threat Definition
T.DATA_LEAK A connection via the PSS between computers may allow
unauthorized data flow through the PSS or its connected
peripherals.
T.SIGNAL_LEAK A connection via the PSS between computers may allow
unauthorized data flow through bit-by-bit signaling.
T.RESIDUAL_LEAK A PSS may leak (partial, residual, or echo) user data
between the intended connected computer and another
unintended connected computer. More specifically, a PSS
may leak user keyboard entries to a PSS-connected
computer other than the selected computer in real-time
or at a later time.
T.UNINTENDED_SWITCHING A threat in which the user is connected to a computer
other than the one to which they intended to be
connected.
T.UNAUTHORIZED_DEVICES The use of an unauthorized peripheral device with a
specific PSS peripheral port may allow unauthorized data
flows between connected devices or enable an attack on
the PSS or its connected computers.
T.AUTHORIZED_BUT_UNTRUSTED_DEVICES The use of an authorized peripheral device with the PSS
may still cause unauthorized data flows between
connected devices or enable an attack on the PSS or its
connected computers. Such threats are possible due to
known or unknown device vulnerabilities or due to
additional functions within the authorized peripheral
device.
T.MICROPHONE_USE
Microphone connected to the TOE used for audio
eavesdropping or to transfer data across an air-gap
through audio signaling.
T.AUDIO_REVERSED
Audio output device used by an attacker as a low-gain
microphone for audio eavesdropping. This threat is an
abuse of the computer and TOE audio output path to
reverse the analog data flow from the headphones to the
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computer. The computer then amplifies and filters the
weak signal, and then digitizes and streams it to another
location.
T.LOGICAL_TAMPER An attached device (computer or peripheral) with
malware, or otherwise under the control of a malicious
user, could modify or overwrite code embedded in the
TOE’s volatile or non-volatile memory to allow
unauthorized information flows between connected
devices.
T.PHYSICAL_TAMPER A malicious human agent could physically tamper with or
modify the TOE to allow unauthorized information flows
between connected devices.
T.REPLACEMENT A malicious human agent could replace the TOE during
shipping, storage, or use with an alternate device that
does not enforce the TOE security policies.
T. FAILED Detectable failure of a PSS may cause an unauthorized
information flow, weakening of PSS security functions, or
unintended switching.
Table 11 – Threats addressed by the TOEs
3.2.2 Threats addressed by the IT Operating Environment
The Protection Profile claimed identifies no threats to the assets against which specific protection within
the TOE environment is required.
3.3 Organizational Security Policies
The Protection Profile claimed identifies no Organizational Security Policies (OSPs) to which the TOE
must comply.
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4 Security Objectives
This chapter describes the security objectives for the TOE and the Operational Environment. The
security objectives are divided between TOE Security Objectives (for example, security objectives
addressed directly by the TOE) and Security Objectives for the Operating Environment (for example,
security objectives addressed by the IT domain or by non-technical or procedural means).
4.1 Security Objectives for the TOE
This section defines the IT security objectives that are to be addressed by the TOE.
Security Objective Definition as applied to KVM type TOE
O.COMPUTER_INTERFACE_ISOLATION The TOE must prevent unauthorized data flow to assure
that the TOE and/or its connected peripheral devices
would not be exploited in an attempt to leak data. The
TOE computer interface shall be isolated from all other
TOE computer interfaces while TOE is powered.
O.COMPUTER_INTERFACE_ISOLATION_TOE
_UNPOWERED
The same level of isolation defined in the dataflow
objectives must be maintained at all times, including
periods while TOE is unpowered.
O.USER_DATA_ISOLATION User data such as keyboard entries should be switched
(i.e., routed) by the TOE only to the computer selected
by the user.
The TOE must provide isolation between the data
flowing from the peripheral device to the selected
computer and any non-selected computer.
O.NO_USER_DATA_RETENTION The TOE shall not retain user data after it is powered
down.
O.
PURGE_TOE_KB_DATA_WHILE_SWITCHING
The TOE shall purge all user keyboard data from
computer interfaces following channel switching and
before interacting with the new connected computer.
O.NO_DOCKING_PROTOCOLS The use of docking protocols such as DockPort, USB
docking, Thunderbolt etc. is not allowed in the TOE.
O.NO_OTHER_EXTERNAL_INTERFACES The TOE may not have any wired or wireless external
interface with external entities (external entity is an
entity outside the TOE evaluated system, its connected
computers and peripheral devices).
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O.NO_ANALOG_AUDIO_INPUT Shared audio input peripheral functions (i.e., analog
audio microphone input or line input) are not allowed in
the TOE.
O.UNIDIRECTIONAL_AUDIO_OUT The TOE shall be designed to assure that reverse audio
signal attenuation will be at least 30 dBv measured with
200 mV and 2V input pure sinus wave at the extended
audio frequency range including negative swing signal.
The level of the reverse audio signal received by the
selected computer shall be minimal to assure that the
signal level generated by headphones will be well under
the noise floor level.
O.COMPUTER_TO_AUDIO_ISOLATION The TOE audio dataflow shall be isolated from all other
TOE functions. Signal attenuation between any TOE
computer interface and any TOE audio interface shall be
at least 45 dBv measured with 2V input pure sinus wave
at the extended audio frequency range including
negative swing signal.
O.USER_AUTHENTICATION_ISOLATION The user authentication function shall be isolated from
all other TOE functions.
O.USER_AUTHENTICATION_RESET Unless the TOE emulates the user authentication
function, upon switching computers, the TOE shall reset
(turn off and then turn on) the power supplied to the
user authentication device for at least 1 second.
O.USER_AUTHENTICATION_TERMINATION If the TOE emulates the user authentication function (i.e.
multiple instances of the user authentication device are
coupled to multiple computers at the same time), then
once the authentication session is terminated (e.g. the
smart card is removed), the session must terminate
immediately in all connected computers.
O.USER_AUTHENTICATION_ADMIN If the TOE is capable of being configured with user
authentication device qualification parameters after
deployment, then such configuration may only
performed by an authenticated administrator.
O. AUTHORIZED_SWITCHING The TOE shall allow only authorized switching
mechanisms to switch between connected computers
and shall explicitly prohibit or ignore unauthorized
switching mechanisms.
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O.NO_AMBIGUOUS_CONTROL If the TOE allows more than one authorized switching
mechanism, only one method shall be operative at any
given time to prevent ambiguous commands.
O.CONTINUOUS_INDICATION The TOE shall provide continuous visual indication of the
computer to which the user is currently connected.
O.KEYBOARD_AND_MOUSE_TIED The TOE shall ensure that the keyboard and mouse
devices are always switched together
O.NO_CONNECTED_COMPUTER_CONTROL The TOE shall not allow TOE control through a
connected computer.
O.PERIPHERAL_PORTS_ISOLATION The TOE shall prevent data flow between peripheral
devices of different SPFs and the TOE peripheral device
ports of different SPFs shall be isolated.
O.DISABLE_UNAUTHORIZED_PERIPHERAL The TOE shall only allow authorized peripheral device
types (See Annex C) per peripheral device port; all other
devices shall be identified and then rejected or ignored
by the TOE.
O.DISABLE_UNAUTHORIZED_ENDPOINTS The TOE shall reject unauthorized peripheral devices
connected via a USB hub. Alternatively, the TOE may
reject all USB hubs.
O.KEYBOARD_MOUSE_EMULATED The TOE keyboard and pointing device functions shall be
emulated (i.e., no electrical connection other than the
common ground is allowed between peripheral devices
and connected computers).
O.KEYBOARD_MOUSE_UNIDIRECTIONAL The TOE keyboard and pointing device data shall be
forced to unidirectional flow from the peripheral device
to the switched computer only.
O.UNIDIRECTIONAL_VIDEO The TOE shall force native video peripheral data (i.e.,
red, green, blue, and TMDS lines) to unidirectional flow
from the switched computer to the connected display
device.
O.UNIDIRERCTIONAL_EDID A TOE that supports VGA, DVI, DisplayPort or HDMI
video shall force the display EDID peripheral data
channel to follow a unidirectional flow and only copy
once from the display to each one of the appropriate
computer interfaces during the TOE power up or reboot
sequence. The TOE must prevent any EDID channel write
transactions initiated by connected computers.
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O.DISPLAYPORT_AUX_FILTERING TOE that supports DisplayPort video shall prevent (i.e.,
filter or otherwise disable) the following auxiliary
channel (AUX) transaction types: EDID write, USB,
Ethernet, Audio return channel, universal asynchronous
receiver/transmitter (UART) and MCCS. Alternatively,
the TOE may prevent the AUX channel from operating at
Fast AUX speed (675/720 Mbps) while preventing MCCS
transactions.
O.TAMPER_EVIDENT_LABEL The TOE shall be identifiable as authentic by the user
and the user must be made aware of any procedures or
other such information to accomplish authentication.
This feature must be available upon receipt of the TOE
and continue to be available during the TOE
deployment.
The TOE shall be labeled with at least one visible and
one invisible unique identifying tamper-evident marking
that can be used to authenticate the device. The TOE
manufacturer must maintain complete list of
manufactured TOE articles and their respective
identification markings’ unique identifiers.
O.ANTI_TAMPERING The TOE shall be physically enclosed so that any
attempts to open or otherwise access the internals or
modify the connections of the TOE would be evident.
This shall be accomplished through the use of an always-
on active anti-tampering system that serves to
permanently disable the TOE should its enclosure be
opened. The TOE shall use an always-on active anti-
tampering system to permanently disable the TOE in
case physical tampering is detected.
O.ANTI_TAMPERING_BACKUP_POWER The anti-tampering system must have a backup power
source to enable tamper detection while the TOE is
unpowered.
O.ANTI_TAMPERING_BACKUP_FAIL_TRIGG
ER
A failure or depletion of the anti-tampering system
backup power source shall trigger TOE to enter
tampered state.
O.ANTI_TAMPERING_INDICATION The TOE shall have clear user indications when
tampering is detected.
O.ANTI_TAMPERING_PERMANENTLY_DISA
BLE_TOE
Once the TOE anti-tampering is triggered, the TOE shall
become permanently disabled. No peripheral-to-
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computer data flows shall be allowed.
O.NO_TOE_ACCESS The TOE shall be designed so that access to the TOE
firmware, software, or its memory via its accessible
ports is prevented.
O.SELF_TEST The TOE shall perform self-tests following power up or
powered reset.
O.SELF_TEST_FAIL_TOE_DISABLE Upon critical failure detection the TOE shall disable
normal operation of the whole TOE or the respective
failed component.
O.SELF_TEST_FAIL_INDICATION The TOE shall provide clear and visible user indications in
the case of a self-test failure.
Table 12 - TOE Security Objectives definitions (derived from the PP)
Notes:
1. Objective O.USER_AUTHENTICATION_TERMINATION is not applicable to the Secure KVM and
Matrix TOE per referenced PP as it does not support emulated user authentication device
function.
2. O.DISPLAYPORT_AUX_FILTERING is not applicable for HSL KVM TOEs as none of the TOE support
DisplayPort display (Native DisplayPort format video).
4.2 Security Objectives for the Operational Environment
The following IT security objectives for the environment are to be addressed by the Operational
Environment by technical means.
Environment Security Objective Definition
OE. NO_TEMPEST The operational environment will not require the use of
TEMPEST approved equipment.
OE.
NO_SPECIAL_ANALOG_CAPABILITIES
The operational environment will not require special analog
data collection cards or peripherals such as: Analog to digital
interface, high performance audio interface, Digital Signal
Processing function, and analog video capture function.
OE.PHYSICAL The operational environment will provide physical security,
commensurate with the value of the TOE and the data it
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contains.
OE.TRUSTED_ADMIN The operational environment will ensure that appropriately
trained and trusted TOE Administrators and users are
available to administer, configure and use the TOE.
Table 13 - Operational Environment Security Objectives (from the PP)
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4.3 Rationale
This section demonstrates that each threat, organizational security policy, and assumption are mitigated
by at least one security objective for the TOE, and that those security objectives counter the threats,
enforce the policies, and uphold the assumptions.
Threats,
Policies,
Assumptions:
Objectives:
T.DATA_LEAK
T.SIGNAL_LEAK
T.RESIDUAL_LEAK
T.UNINTENDED_SWITCHING
T.UNAUTHORIZED_DEVICES
T.AUTHORIZED_BUT_UNTRUSTED_DEVICES
T.LOGICAL_TAMPER
T.PHYSICAL_TAMPER
T.REPLACEMENT
T.FAILED
A.NO_TEMPEST
A.NO_SPECIAL_ANALOG_CAPABILITIES
A.PHYSICAL
A.TRUSTED_ADMIN
A.TRUSTED_CONFIG
O.COMPUTER_INTERFACE_ISOLATION ● ●
O.COMPUTER_INTERFACE_ISOLATION_TO
E_UNPOWERED
●
O.USER_DATA_ISOLATION
●
O.NO_USER_DATA_RETENTION
●
O.PURGE_TOE_KB_DATA_WHILE_SWITCHI
NG
●
O.NO_DOCKING_PROTOCOLS
●
O.NO_OTHER_EXTERNAL_INTERFACES
● ●
O.NO_ANALOG_AUDIO_INPUT
●
O.UNIDIRECTIONAL_AUDIO_OUT
●
O.COMPUTER_TO_AUDIO_ISOLATION
●
O.USER_AUTHENTICATION_ISOLATION
●
O.USER_AUTHENTICATION_RESET
● ● ●
O.USER_AUTHENTICATION_TERMINATION
● ● ●
O.USER_AUTHENTICATION_ADMIN
●
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O.AUTHORIZED_SWITCHING
●
O.NO_AMBIGUOUS_CONTROL
●
O.CONTINUOUS_INDICATION
●
O.KEYBOARD_AND_MOUSE_TIED
●
O.NO_CONNECTED_COMPUTER_CONTRO
L
●
O.PERIPHERAL_PORTS_ISOLATION
● ●
O.DISABLE_UNAUTHORIZED_PERIPHERAL
●
O.DISABLE_UNAUTHORIZED_ENDPOINTS ●
O.KEYBOARD_MOUSE_EMULATED ●
O.KEYBOARD_MOUSE_UNIDIRECTIONAL ●
O.UNIDIRECTIONAL_VIDEO ●
O.UNIDIRERCTIONAL_EDID ●
O.TAMPER_EVIDENT_LABEL
● ●
O.ANTI_TAMPERING
●
O.ANTI_TAMPERING_BACKUP_POWER
●
O.ANTI_TAMPERING_BACKUP_FAIL_TRIGG
ER
●
O.ANTI_TAMPERING_INDICATION
●
O.ANTI_TAMPERING_PERMANENTLY_DISA
BLE_TOE
●
O.DISPLAYPORT_AUX_FILTERING ●
O.NO_TOE_ACCESS ●
O.SELF_TEST
●
O.SELF_TEST_FAIL_TOE_DISABLE
●
O.SELF_TEST_FAIL_INDICATION ●
OE. NO_TEMPEST ●
OE. NO_SPECIAL_ANALOG_CAPABILITIES ●
OE.PHYSICAL ●
OE.TRUSTED_ADMIN ● ●
Table 14 - Sufficiency of Security Objectives
Notes:
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1. Cells marked in ● are indicating an objective that appears in the PP and shall be met by the KVM
and Matrix TOEs.
2. Rational for objectives not met is given in table 16 at the next paragraph.
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4.3.1 TOE Security Objectives Rationale
Threats, Policies, and
Assumptions
Summary Objectives and rationale
Cross Computer Flow Data Flow Isolation
T.DATA_LEAK
A CONNECTION, via the
TOE, between connected
computers may allow
unauthorized data
transfer through the TOE
or its connected
peripherals.
O.COMPUTER_INTERFACE_ISOLATION
The TOE must prevent unauthorized
data flow to assure that the TOE and/or
its connected peripheral devices would
not be exploited in an attempt to leak
data. The TOE computer interface shall
be isolated from all other TOE
computer interfaces while TOE is
powered.
O.COMPUTER_INTERFACE_ISOLATION
partially mitigates that threat through
the prevention of potential data flows
between the different computer
interfaces in the TOE. The assurance of
isolation between the TOE computer
ports prevents data leakages between
TOE connected computers directly
between the computer interfaces.
O.COMPUTER_INTERFACE_ISOLATION_
UNPOWERED
The same level of isolation defined in
the dataflow objectives must be
maintained at all times, including
periods while TOE is unpowered.
O.COMPUTER_INTERFACE_ISOLATION
_UNPOWERED counters this threat
through the prevention of data flow
between TOE computer interfaces
during periods that TOE is unpowered.
The TOE and its connected computers
may have independent power sources
or different power management
policies. Computer interface isolation in
TOE unpowered state must be equal or
better than computer interface
isolation in TOE powered state.
O.USER_DATA_ISOLATION
User data such as keyboard entries
should be switched (i.e., routed) by the
TOE only to the computer selected by
the user.
The TOE must provide isolation
between the data flowing from the
peripheral device to the selected
computer and any non-selected
computer.
O.USER_DATA_ISOLATION mitigates
that threat by ensuring that user data
in the TOE will only flow to the user
selected computer.
To prevent user data leakage, it is
critical that user data from the
peripheral input device will flow only to
the user selected computer. A leakage
of user data to another computer
interface may disclose classified user
information.
For example, user credentials typed by
the user while the TOE is connected to
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the secret computer may not leak to
any other computer interface to
prevent disclosure of classified
credentials through another non-
classified (and potentially
compromised) computer.
O.NO_DOCKING_PROTOCOLS
The use of docking protocols such as
DockPort, USB docking, Thunderbolt
etc. is not allowed in the TOE.
O.NO_DOCKING_PROTOCOLS
mitigates that threat by preventing the
use of complex protocols capable of
supporting unsecure traffic.
As peripheral protocols become more
capable, multiple functions may be
combined into a single physical
interface. The use of such protocols in
the TOE shall be limited as the
protection and isolation cannot be
assured with such protocols when
peripheral devices are frequently
switched. Such switching may cause
data leakages between connected
computers through docking protocols.
Composite protocols such as
DisplayPort may be used if the TOE is
capable of mitigating and effectively
removing content other than video and
audio.
O.NO_OTHER_EXTERNAL_INTERFACES
The TOE may not have any wired or
wireless external interfaces with
external entities (external entity is an
entity outside the TOE evaluated
system, its connected computers and
peripheral devices).
O.NO_OTHER_EXTERNAL_INTERFACES
counters this threat by ensuring that
the TOE would not support external
interfaces that may inject code or data
into the authorized traffic flowing
through it.
The presence of a data reception
function (wired or wireless) inside the
TOE may cause unauthorized data flow
or signal leak between external entities
and sensitive connected computers and
networks.
O.USER_AUTHENTICATION_ISOLATION
The user authentication function shall
be isolated from all other TOE
functions.
O.USER_AUTHENTICATION_ISOLATION
mitigates that threat by ensuring that
the bidirectional user authentication
traffic would not be abused to leak
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data across the TOE between
connected computers.
User authentication device requires a
bidirectional channel between the
device and the connected computer
through the TOE. That channel may
contain classified user information. The
TOE must prevent leakage of this data
to other TOE interfaces.
O.USER_AUTHENTICATION_RESET
Unless the TOE emulating the user
authentication function, upon
switching computers, the TOE shall
reset (turn off and then turn on) the
power supplied to the user
authentication device for at least 1
second.
O.USER_AUTHENTICATION_RESET
mitigates that threat by ensuring that
all state and volatile memory in the
connected user authentication device
will be deleted (through power
recycling reset) prior to connecting to a
new computer.
O.PERIPHERAL_PORTS_ISOLATION
The TOE shall prevent data flow
between peripheral devices of different
SPFs. The TOE peripheral device ports
of different SPFs shall be isolated (See
Annex D, Table 1, Flows F and G).
O.PERIPHERAL_PORTS_ISOLATION
counters this threat by ensuring that
peripheral ports are isolated to prevent
unauthorized data flow between
peripheral ports.
It is assumed in this PP that all standard
peripheral devices may be untrusted;
therefore, the TOE shall protect the
system from attacks that may exploit
such devices to enable unauthorized
data flows. Since the TOE may switch
peripheral devices of different Shared
Peripheral Functions (SPFs) to different
computers, data flow between these
devices must be protected to prevent
unauthorized data flow between
connected computers.
T.SIGNAL_LEAK
A CONNECTION, via the
TOE, between
COMPUTERS may allow
unauthorized data
transfer through BIT-BY-
BIT signaling.
O.COMPUTER_INTERFACE_ISOLATION
The TOE must prevent unauthorized
data flow to assure that the TOE and/or
its connected peripheral devices would
not be exploited in an attempt to leak
data. The TOE computer interface shall
be isolated from all other TOE
computer interfaces.
O.COMPUTER_INTERFACE_ISOLATION
mitigates that threat by ensuring that
the computer interfaces would not be
abused for signaling attack.
The existence of an unauthorized data
flow in the TOE between two computer
interfaces may cause signaling leakages
across the TOE or its connected
High Security Labs Secure DP-DP KVM and Mini-Matrix Security Target
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peripherals. As computers connected
to the TOE may have wide security gap,
this may cause classified data (not
necessarily user data) to leak to non-
classified (potentially compromised)
computers.
O.NO_OTHER_EXTERNAL_INTERFACES
The TOE may not have any wired or
wireless external interfaces with
external entities (external entity is an
entity outside the TOE evaluated
system, its connected computers and
peripheral devices).
O.NO_OTHER_EXTERNAL_INTERFACES
mitigates that threat by ensuring that
the TOE does not contain external
interfaces that may inject data into the
user data. Such functions may be
abused to signal injected data into a
connected computer.
O.NO_OTHER_EXTERNAL_INTERFACES
further mitigates that threat by
ensuring that the TOE does not contain
any wired or wireless external interface
that may export data to outside entity.
Such functions may be abused to signal
sensitive data from a connected
computer.
O.NO_ANALOG_AUDIO_INPUT
Shared audio input peripheral functions
(i.e., analog audio microphone input or
line input) are not allowed in the TOE.
O.NO_ANALOG_AUDIO_INPUT
counters this threat by preventing the
passage of the highly-sensitive analog
audio input or microphone signals
through the TOE.
This limitation is important in order to
prevent exploitation of the connected
computer audio codec function to
detect, filter, amplify and detect weak
signals inside or around the TOE to
perform a signaling attack.
O.UNIDIRECTIONAL_AUDIO_OUT
A TOE with an audio switching function
shall enforce unidirectional flow of
analog signals between the connected
computer and the TOE audio peripheral
device output.
A TOE with an audio switching function
shall be designed to assure that reverse
signal attenuation will be at least 30
O.UNIDIRECTIONAL_AUDIO_OUT
counters this threat by preventing the
exploitation of the analog audio output
to receive signaled data from a
connected computer.
Analog audio output in standard
computers may be exploited to become
audio input in some audio codecs.
Audio devices such as headphones may
also be used as low-gain dynamic
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dBv measured with 200 mV and 2V
input pure sinus wave at the extended
audio frequency range including
negative swing signal. The level of the
reverse audio signal received by the
selected computer shall be minimal to
assure that the signal level generated
by headphones will be well under the
noise floor level.
microphone.
If the TOE design assures that analog
audio reverse signal attenuation is
below the noise floor level then the
audio signal may not be recovered
from the resulted audio stream. This
will prevent potential abuse of
headphones connected to the TOE for
audio eavesdropping.
The values selected in the objective
was set by analysis and validated by
empirical results.
O.COMPUTER_TO_AUDIO_ISOLATION
The audio data flow shall be isolated
from all other TOE functions. Signal
attenuation in the extended audio
frequency range between any TOE
computer interface and any TOE audio
interface shall be at least 45 dBv
measured with 2V input pure sinus
wave at the extended audio frequency
range including negative swing signal.
O.COMPUTER_TO_AUDIO_ISOLATION
counters this threat by assuring that
analog audio output converted to input
by a malicious driver would not pick up
signals from other computer interfaces.
A TOE design that assures that audio
signal would not be leaking to any
other TOE interface can effectively
prevent a potential signaling leakage
across the TOE through the analog
audio.
The values selected in the objective
was set by analysis and validated by
empirical results.
O.NO_CONNECTED_COMPUTER_CONT
ROL
The TOE shall not allow TOE control
through a connected computer.
O.NO_CONNECTED_COMPUTER_CONT
ROL reduces the threat by preventing
high speed signaling attacks that abuse
TOE channel switching.
A malicious signaling attack on the TOE
may be accelerated if a compromised
connected computer is capable of
controlling the TOE selected channel.
Bit-by-bit leakages may occur at the
rate of one or multiple bits per TOE
switch. This rate may increase to
several kilobytes per second if the TOE
is allowed to be controlled by a
connected computer.
O.USER_AUTHENTICATION_RESET
Unless the TOE emulating the user
O.USER_AUTHENTICATION_RESET
mitigates this threat by eliminating
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authentication function, upon
switching computers, the TOE shall
reset (turn off and then turn on) the
power supplied to the user
authentication device for at least 1
second.
potential state memory in the
connected user authentication device
after switching to a new computer.
Power recycling of the connected user
authentication device assures that
states and volatile registers will be
erased while the TOE switches between
computers.
Testing showed that all USB powered
authentication devices would reset if
powered down for 1 second. In case
that specific USB device would not
properly reset, vendor may implement
longer power down intervals.
T.RESIDUAL_LEAK
A PSS may leak (partial,
residual, or echo) user
data between the
intended connected
computer and another
unintended connected
computer. More
specifically, a PSS may
leak user keyboard
entries to a PSS-
connected computer
other than the selected
computer in real-time or
at a later time.
O.NO_USER_DATA_RETENTION
The TOE shall not retain user data after
it is powered down.
It should be noted that user data does
not include the TOE or peripherals
configuration and therefore such data
may remain in the TOE after it is
powered off.
O.NO_USER_DATA_RETENTION
counters this threat by preventing user
data retention at the TOE when it is
being powered off.
As TOE may be reused inside the
organization to serve different users /
roles at different time, it is critical that
no user information will be stored in
the TOE after it is being powered off.
O.PURGE_TOE_KB_DATA_WHILE_SWIT
CHING
The TOE shall purge all user keyboard
data from computer interfaces
following channel switching and before
interacting with the new connected
computer.
O.PURGE_TOE_KB_DATA_WHILE_SWI
TCHING assures that when TOE is
switched, user keyboard data will not
flow to the previously selected
computer. It mitigates this threat by
deleting user keyboard data while
switching between channels.
Unintended Switching Control and Monitoring
T.UNINTENDED_SWITCHI
NG
A threat in which the user
is connected to a
computer other than the
one to which they
intended to be
connected.
O.AUTHORIZED_SWITCHING
The TOE shall allow only authorized
switching mechanisms to switch
between connected computers and
shall explicitly prohibit or ignore
unauthorized switching mechanisms.
Authorized switching mechanisms shall
require physical, zero-distance touch
and include push-buttons, touch
screen and mouse or cursor control.
O.AUTHORIZED_SWITCHING mitigates
this threat by preventing unauthorized
switching methods that may cause user
confusion and loss of situational
awareness.
A TOE with unauthorized switching
mechanisms may cause misalignment
between the actual TOE state and the
user understanding of the TOE state.
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Unauthorized switching mechanisms
include keyboard shortcuts, also
known as “hotkeys,” automatic
scanning and voice activation.
O.NO_AMBIGUOUS_CONTROL
If the TOE allows more than one
authorized switching mechanism, only
one method shall be operative at any
given time to prevent ambiguous
commands.
O.NO_AMBIGUOUS_CONTROL
mitigates this threat by preventing TOE
control mechanisms that are not well-
defined.
Ambiguous TOE control may cause
cases of unintended switching of the
TOE. The TOE controls must be
unambiguous to prevent user confusion
or misinterpretation of the TOE state.
O.CONTINUOUS_INDICATION
The TOE shall provide continuous visual
indication of the computer to which
the user is currently connected.
O.CONTINUOUS_INDICATION counters
this threat by preventing the loss of
TOE indications that may lead to user
confusion.
TOE monitoring must be shown at all
times to reduce the risk of user
confusion or misinterpretation of the
TOE state. It should be noted that the
user may take a break or get
interrupted by multiple activities and
therefore reliance on user memory to
define the TOE state should be avoided.
O.KEYBOARD_AND_MOUSE_TIED
The TOE shall ensure that the keyboard
and mouse devices are always
switched together (i.e., they cannot be
assigned to different peripheral
groups) in order to prevent operational
difficulties.
O.KEYBOARD_AND_MOUSE_TIED
Counters this threat by preventing a
split between keyboard and mouse in
the TOE, thus eliminating the potential
user confusion caused by such a split.
The TOE may enable grouping of
peripheral devices (e.g., audio output
may be switched separately from
keyboard). However, separation of
keyboard and mouse may cause user
confusion and could result in cases of
unintended TOE switching.
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O.USER_AUTHENTICATION_TERMINATI
ON
If the TOE emulates the user
authentication function (i.e. multiple
instances of the user authentication
device are coupled to multiple
computers at the same time), then
once the authentication session is
terminated (e.g. the smart card is
removed), the session must terminate
immediately in all connected
computers.
O.USER_AUTHENTICATION_TERMINAT
ION counters this threat by preventing
an emulated user authentication device
from having an active authentication
session in computers that are currently
not selected by the TOE user. The TOE
prevents this threat by terminating all
actively connected authentication
sessions simultaneously.
Peripheral Device
Threats
Connected Peripheral Devices
T.UNAUTHORIZED_DEVIC
ES
The use of unauthorized
peripheral devices with a
specific TOE peripheral
port may allow
unauthorized information
flows between connected
devices or enable an
attack on the TOE or its
connected computers.
O.PERIPHERAL_PORTS_ISOLATION
The TOE shall prevent data flow
between peripheral devices of
different SPFs. TOE peripheral device
ports of different SPFs shall be isolated
(See Annex D, Table 1, Flows F and G).
O.PERIPHERAL_PORTS_ISOLATION
mitigates this threat by eliminating
potential electronic or logic linkage
between the various TOE peripheral
device ports.
A TOE with peripheral port isolation will
provide a higher level of protection
from malicious or unauthorized
peripheral devices.
O.DISABLE_UNAUTHORIZED_PERIPHER
AL
The TOE shall only allow authorized
peripheral device types (See Annex C)
per peripheral device port; all other
devices shall be identified and then
rejected or ignored by the TOE.
O.DISABLE_UNAUTHORIZED_PERIPHER
AL mitigates this threat by disabling
unauthorized peripheral devices based
on device profiling. Such peripheral
device disabling is an effective means
against the use of unauthorized
peripheral devices.
O.DISABLE_UNAUTHORIZED_ENDPOIN
TS
The keyboard and pointing device
peripheral ports of the TOE shall reject
any composite USB devices with
endpoints other than those authorized
for that specific port (See Annex C).
Device rejection shall be accomplished
either by completely disabling the
connected device or disabling just the
unauthorized endpoint(s). Similarly,
O.DISABLE_UNAUTHORIZED_ENDPOIN
TS Assures that TOE connected
peripheral devices with unauthorized
functions (i.e., endpoints) are disabled
and therefore would not be used.
TOE rejection of unauthorized
peripheral devices or functions within
the devices is an effective means
against the intended or unintended use
of such devices or functions.
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the TOE shall reject unauthorized
peripheral devices connected via a USB
hub (alternatively, the TOE may reject
all USB hubs).
O.USER_AUTHENTICATION_ADMIN
If the TOE is capable of being
configured after deployment with user
authentication device qualification
parameters then such configuration
may only performed by an
administrator.
O.USER_AUTHENTICATION_ADMIN
mitigates this threat by assuring that
only the administrator will be able to
modify the accepted user
authentication device profile (for TOE
that supports configurable user
authentication device profiling). This
prevent unauthorized users from
modifying the profile and potentially
allowing the usage of a malicious or
unsecure USB device.
T.AUTHORIZED_BUT_UNT
RUSTED_DEVICES
The use of authorized
peripheral devices with
the TOE may still cause
unauthorized information
flows between connected
devices or enable an
attack on the TOE or its
connected computers.
Such threats are possible
due to known or
unknown vulnerabilities
or due to additional
functions within the
authorized peripheral
device.
All authorized peripheral
devices are treated as
untrusted under this PP.
O.KEYBOARD_MOUSE_EMULATED
The TOE keyboard and pointing device
functions shall be emulated (i.e., no
electrical connection other than the
common ground is allowed between
peripheral devices and connected
computers).
O.KEYBOARD_MOUSE_EMULATED
Assures that authorized devices such as
keyboard and mice would not be
abused to store data while switched
between computers.
Malicious computers connected to the
TOE may exploit certain volatile or non-
volatile memory effects in the
connected keyboard and pointing
device peripherals to temporarily store
data. Such temporary data storage may
be used to transfer data across
connected computers. The use of
emulated functions in the TOE is an
effective method to assure that only
the essential functions of the peripheral
device will be supported.
O.KEYBOARD_MOUSE_UNIDIRECTIONA
L
The TOE keyboard and pointing device
data shall be forced to unidirectional
flow from the peripheral device to the
switched computer only. Such
unidirectional flow enforcement shall
be implemented in the TOE through
physical (i.e., hardware) methods and
not through logical (i.e., firmware
O.KEYBOARD_MOUSE_UNIDIRECTION
AL counters this threat by assuring that
any attempt to store data in the
keyboard and mouse by a compromised
computer or TOE function will be
blocked effectively through a physical
barrier (as opposed to software).
The TOE shall force keyboard and
mouse traffic to unidirectional flow
from the peripheral device to the
High Security Labs Secure DP-DP KVM and Mini-Matrix Security Target
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dependent) methods (See Annex D,
Table 1, Flow B).
connected computer only. If reverse
flow is authorized, then the keyboard
and mouse may be abused by a
compromised connected computer to
store data and as a result, leak data
between connected computers.
O.UNIDIRECTIONAL_VIDEO
TOEs that support VGA, DVI or HDMI
video shall force native video
peripheral data (i.e., red, green, blue,
and TMDS lines) to unidirectional flow
from the switched computer to the
connected display device (See Annex D,
Table 1, Flow I2).
O.UNIDIRECTIONAL_VIDEO mitigates
the threat by preventing any potential
reversal of the video path in the TOE
that may be abused to transfer video or
other data from computer-to-computer
through the TOE.
The TOE shall force native video traffic
to unidirectional flow from the
computer to the peripheral only. If
reverse flow is authorized through the
TOE, then logical tampering of the
connected display may cause
unauthorized data flow.
O.UNIDIRERCTIONAL_EDID
TOEs that support VGA, DVI,
DisplayPort or HDMI video shall force
the display EDID peripheral data
channel to unidirectional flow and only
copy once from the display to each one
of the appropriate computer interfaces
during the TOE power up or reboot
sequence. The TOE must prevent any
EDID channel write transactions
initiated by connected computers.
O.UNIDIRERCTIONAL_EDID mitigates
this threat by preventing abuse of
shared displays to transfer data
between connected computers.
All display peripheral devices in use
today have a bidirectional interface
protocols (e.g., EDID channel in DVI,
VGA, HDMI interfaces or AUX channel
in DisplayPort). If the TOE forces a
unidirectional data flow from display to
computers only, then the display may
not be abused to transfer data across
connected computers.
O.DISPLAYPORT_AUX_FILTERING
TOEs that support DisplayPort video
shall prevent (i.e., filter or otherwise
disable) the following auxiliary channel
traffic: EDID write, USB, Ethernet,
Audio return channel, UART and MCCS.
Alternatively, the TOE may prevent the
AUX channel from operating at Fast
AUX speed (675/720 Mbps).
O.DISPLAYPORT_AUX_FILTERING
counters this threat by avoiding the
handling of AUX data other than the
minimum required to support the video
link. This AUX channel filtration assures
that DisplayPort interfaces will not be
misused by a compromised connected
computer in an attempt to transfer
data across connected computers.
O.USER_AUTHENTICATION_RESET O.USER_AUTHENTICATION_RESET
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Unless the TOE emulating the user
authentication function, upon
switching computers, the TOE shall
reset (turn off and then turn on) the
power supplied to the user
authentication device for at least 1
second.
mitigating that threat by preventing
potential data transfer between
computers through known or unknown
volatile memory in an authorized user
authentication device.
Device Tampering Tamper Mitigation
T.LOGICAL_TAMPER
An attached device
(computer or peripheral)
with malware or
otherwise under the
control of a malicious
user could modify or
overwrite code
embedded in TOE volatile
or non-volatile memory
to allow unauthorized
information flows
between connected
devices.
O.NO_TOE_ACCESS
The TOE shall be designed so that
access to the TOE firmware, software,
or its memory via its accessible ports is
prevented. This should be
accomplished by offering no access to
modify the TOE or its memory. To
mitigate the risk that a potential
attacker will tamper a TOE and then
reprogram it with same or tampered
functionality, the TOE external and
internal interfaces shall be locked for
code read and write. The
programmable TOE components
programming ports must be
permanently disabled for both read
and write operations. TOE operation
code may not be upgradeable through
any of the TOE external or internal
ports.
O.NO_TOE_ACCESS counters the threat
of logical tamper by assuring that the
TOE would not have external or internal
ports that provide programming access
or firmware reading of internal
components.
Logical TOE tampering may be
leveraged by the following TOE
functions:
1. Internal or external access to the
TOE firmware, software or memory.
Such access may be used by
potential attacker to modify the
TOE security functions.
2. Programmer port reading or writing
access to the TOE circuitry. Such
open access may be abused by an
attacker to read modify and write
TOE firmware in an attempt to
clone, switch or tamper a TOE.
3. Firmware upgrade function. Such
function may be abused by an
attacker to read, modify and write
TOE firmware in an attempt to
clone, switch or tamper a TOE.
T.PHYSICAL_TAMPER
A malicious human agent
could physically tamper
with or modify the TOE to
allow unauthorized
information flows
between connected
O.ANTI_TAMPERING
The TOE shall be physically enclosed so
that any attempts to open or otherwise
access the internals or modify the
connections of the TOE would be
evident. This shall be accomplished
through the use of an always-on active
O.ANTI_TAMPERING mitigates this
threat by assuring that any attempt to
physically tamper the TOE will cause it
to become permanently disabled and
will provide indications that user
cannot ignore.
High Security Labs Secure DP-DP KVM and Mini-Matrix Security Target
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devices. anti-tampering system that serves to
permanently disable the TOE should its
enclosure be opened.
The TOE shall use an always-on active
anti-tampering system to permanently
disable the TOE in case physical
tampering is detected.
O.ANTI_TAMPERING_BACKUP_POWER
The TOE anti-tampering system must
have a backup power source to enable
tamper detection while the TOE is
unpowered.
O.ANTI_TAMPERING_BACKUP_POWER
assures that the active anti-tampering
function would continue to operate at
all time – even when the TOE is
unpowered.
TOE physical tampering protection
must be continuously operating to
effectively prevent physical tampering
while the TOE is unpowered. Without
such function, TOE power may be
interrupted by the attacker in order to
gain access to the TOE internal circuitry
without triggering the anti-tampering
system.
O.ANTI_TAMPERING_BACKUP_FAIL_TR
IGGER
A failure or depletion of the anti-
tampering system backup power
source shall trigger TOE to enter
tampered state.
O.ANTI_TAMPERING_BACKUP_FAIL_T
RIGGER counters this threat by
ensuring that any case of backup power
source failure causes permanent
tampering to prevent an attacker from
abusing effects such as temperature
exposure or time that may affect
battery or super-capacitors used by the
TOE anti-tampering system in order to
gain access to the TOE internal circuitry.
.
O.ANTI_TAMPERING_INDICATION
The TOE shall have clear user
indications when tampering is
detected.
O.ANTI_TAMPERING_INDICATION
mitigates this threat by assuring that an
event of physical TOE tampering while
in service will be discovered by the user
and reported to the proper security
functions in the organization.
Clear TOE tampering indication,
together with proper user training and
internal procedures, will increase the
probability that a tampered TOE will be
High Security Labs Secure DP-DP KVM and Mini-Matrix Security Target
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properly detected.
O.ANTI_TAMPERING_PERMANENTLY_
DISABLE_TOE
Once the TOE anti-tampering is
triggered, the TOE shall become
permanently disabled. No peripheral-
to-computers data flows shall be
allowed.
O.ANTI_TAMPERING_PERMANENTLY_
DISABLE_TOE counters this threat by
assuring that a tampered TOE will not
continue to be used and possibly leak
data.
Permanent TOE disabling is critical in
order to assure that the TOE would not
be returned to normal service after it
has been tampered.
O.TAMPER_EVIDENT_LABEL
The TOE shall be identifiable as
authentic by the user and the user
must be made aware of any
procedures or other such information
to accomplish authentication. This
feature must be available upon receipt
of the TOE and continue to be available
during the TOE deployment.
The TOE shall be labeled with at least
one visible and one invisible unique
identifying tamper-evident marking
that can be used to authenticate the
device. The TOE manufacturer must
maintain complete list of
manufactured TOE articles and their
respective identification markings’
unique identifiers.
O.TAMPER_EVIDENT_LABEL provides a
higher level of assurance that the TOE
was not physically tampered during
transit or while in service.
A tamper evident label is an effective
means to provide clear visual indication
of physical TOE tampering and also to
assure the authenticity of the TOE.
T.REPLACEMENT
A malicious human agent
could replace the TOE
during shipping, storage,
or use with an alternate
device that does not
enforce the TOE security
policies.
O.TAMPER_EVIDENT_LABEL
The TOE shall be identifiable as
authentic by the user and the user
must be made aware of any
procedures or other such information
to accomplish authentication. This
feature must be available upon receipt
of the TOE and continue to be available
during the TOE deployment.
The TOE shall be labeled with at least
one visible and one invisible unique
identifying tamper-evident marking
that can be used to authenticate the
O.TAMPER_EVIDENT_LABEL provides a
higher level of assurance that the TOE
was not physically tampered during
transit or while in service.
A tamper evident label is an effective
means to provide clear visual indication
of physical TOE tampering and also to
assure the authenticity of the TOE.
High Security Labs Secure DP-DP KVM and Mini-Matrix Security Target
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device. Compliant TOE manufacturer
must maintain complete list of
manufactured TOE articles and their
respective identification markings’
unique identifiers.
Unsafe Failure Fail-Secure and Self-Testing
T.FAILED
Detectable failure of a
TOE causing an
unauthorized information
flow or weakening of TOE
security functions.
O.SELF_TEST
The TOE shall perform self-tests
following power up or powered reset.
The self-testing should at least cover:
1. The basic integrity of the TOE
hardware and firmware;
2. The basic computer-to-computer
isolation (See Annex D, Table 1, Flows J
and K); and
3. The other critical security functions
(i.e., user control and anti-tampering).
For example, the following steps may
be used to test basic isolation during
power up:
1. The TOE is switched to channel 1;
2. A test packet is sent to the
computer connected to channel 1;
and
The self-test function checks that all
other ports are not receiving any data.
O.SELF_TEST mitigates the threat by
increasing the probability that a critical
TOE failure affecting security would be
discovered. It is also reduces the time
that the TOE would continue to operate
with such failure.
The TOE shall be equipped with a self-
test function in order to detect failures
of underlying security mechanisms used
by the TOE and in order to provide clear
user indications in case such a failure is
detected.
O.SELF_TEST_FAIL_TOE_DISABLE
Upon critical failure detection the TOE
shall disable normal operation of the
whole TOE or the respective failed
component.
O.SELF_TEST_FAIL_TOE_DISABLE
counters this threat by assuring that
upon TOE failure detection, the user
would not be able to continue using the
TOE, thus reducing the potential
security damage of a failure.
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If the TOE resumed normal operation
after critical failure detection, the user
may not be aware of the failure and as
a result, data may leak through the
TOE.
O.SELF_TEST_FAIL_INDICATION
The TOE shall provide clear and visible
user indications in the case of a self-
test failure. Such indication will
preferably include details about the
detected failure and its severity.
O.SELF_TEST_FAIL_INDICATION
counters this threat by providing proper
user guidance in case the TOE detects a
failure. The indication should be used
to guide immediate TOE disconnection
from its working environment to
prevent further potential security
damages.
If the TOE does not provide clear failure
indication after critical failure
detection, the user may not be aware
of the failure and as a result, data may
leak through the TOE.
Table 15 – TOE Security Objectives rationale
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4.3.2 Security Objectives Rationale for the Operational Environment
Threats, Policies, and Assumptions Summary Objectives and rationale
A.NO_TEMPEST
It is assumed that the computers and
peripheral devices connected to the
TOE are not TEMPEST approved.
OE. NO_TEMPEST
The operational
environment will not
require the use of
TEMPEST approved
equipment.
OE. NO_TEMPEST upholds this
assumption by ensuring that the
operational environment does not
impose requirements for TEMPEST
approved equipment.
A.NO_SPECIAL_ANALOG_CAPABILITIE
S
It is assumed that the computers
connected to the TOE are not
equipped with special analog data
collection cards or peripherals such as:
Analog to digital interface, high
performance audio interface, Digital
Signal Processing function, and analog
video capture function.
OE.
NO_SPECIAL_ANALOG
_
CAPABILITIES
The operational
environment will not
require special analog
data collection cards or
peripherals such as:
Analog to digital
interface, high
performance audio
interface, Digital Signal
Processing function,
and analog video
capture function.
OE.
NO_SPECIAL_ANALOG_CAPABILITIE
S upholds this assumption by
ensuring that the operational
environment does not impose
requirements for special analog data
collection cards or peripherals.
A.PHYSICAL
Physical security, commensurate with
the value of the TOE and the data it
contains, is assumed to be provided
by the environment.
OE.PHYSICAL
The operational
environment will
provide physical
security,
commensurate with
the value of the TOE
and the data it
contains.
OE.PHYSICAL upholds this
assumption by ensuring that the
operational environment provides
physical security, commensurate
with the value of the TOE and the
data it contains.
A.TRUSTED_ADMIN
TOE Administrators and users are
trusted to follow and apply all
guidance in a trusted manner.
OE.TRUSTED_ADMIN
The operational
environment will
ensure that
appropriately trained
and trusted TOE
Administrators and
OE.TRUSTED_ADMIN upholds this
assumption by ensuring that only
appropriately trained and trusted
administrators and users will be
exercising TOE functions.
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users are available to
administer, configure
and use the TOE.
A.TRUSTED_CONFIG
Personnel configuring the TOE and its
operational environment will follow
the applicable security configuration
guidance.
OE.TRUSTED_ADMIN
The operational
environment will
ensure that
appropriately trained
and trusted TOE
Administrators and
users are available to
administer, configure
and use the TOE.
OE.TRUSTED_ADMIN upholds this
assumption by ensuring that only
appropriately trained and trusted
administrators and users will be
configuring the TOE.
Table 16 – Operational Environment Security Objectives rationale
4.4 Rationale for Organizational Policy Coverage
There are no Organizational Policies for this TOE.
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5 Extended Components Definition
The Extended Components Definition describes components for security objectives which cannot be
translated or could only be translated with great difficulty to existing requirements.
The following extended requirements were depicted from Annex H of the PP.
Extended Security Functional Requirements
FTA_CIN_EXT Continuous Indications
FTA_ATH_EXT User Authentication Device Reset and
Termination
Table 17 - Extended SFR Components
5.1 Family FTA_CIN_EXT: Continuous Indications
The extended family belongs to the FTA: TOE Access class and has been created to provide for a
continuous indication of the connected computer port group. FTA_CIN_EXT.1 is modeled after
FTA_TAB.1.
Family Behavior
This family defines the requirements for continuous indications. This family may be used to specify that
the TOE must provide an indication of its operational state.
Component Leveling
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Figure 5 - FTA_CIN_EXT.1: Continuous Indications
Management
There are no management activities foreseen.
Audit
There are no auditable events foreseen.
Hierarchical to: No other components.
Dependencies: No dependencies.
FTA_CIN_EXT.1.1 The TSF shall display a continuous visual indication of the computer to which
the user is currently connected, including on power up, [on reset].
5.2 Class FTA_ATH_EXT: User Authentication Device Reset and Termination
The extended family belongs to the FTA: TOE access class and has been created to describe reset and
termination activities associated with the use of a user authentication device peripheral. Both
FTA_ATH_EXT.1 is modeled after FTA_SSL.4, User-initiated termination.
Family Behavior
This family defines the requirements for the use of an authentication device, including the reset and
termination of authentication devices.
Component Leveling
FTA_CIN_EXT.1: Continuous Indications 1
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Figure 6 - FTA_ATH_EXT: User authentication device reset and termination
Management
There are no management activities foreseen for either FTA_ATH_EXT.1.
Audit
There are no auditable events foreseen for either FTA_ATH_EXT.1.
FTA_ATH_EXT.1 User authentication device reset
Hierarchical to: No other components.
Dependencies: No dependencies.
FTA_ATH_EXT.1.1 The TSF shall reset the power supplied to the user authentication device for
at least one second when the user switches the device from one computer to
another.
Application Notes:
It is assumed that the user authentication device is not powered by an external power source.
FTA_ATH_EXT: User authentication device
reset and termination
1
2
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6 Security Requirements
This section defines the IT security requirements that shall be satisfied by the TOE or its environment.
The CC divides TOE security requirements into two categories:
• Security functional requirements (SFRs) (such as, identification and authentication, security
management, and user data protection) that the TOE and the supporting evidence need to
satisfy to meet the security objectives of the TOE.
• Security assurance requirements (SARs) that provide grounds for confidence that the TOE and
its supporting IT environment meet its security objectives (e.g., configuration management,
testing, and vulnerability assessment).
These requirements are discussed separately within the following subsections.
6.1 Security Functional Requirements for the TOE
The security requirements that are levied on the TOE are specified in this section of the ST.
6.1.1 Overview
The TOE satisfies the SFRs delineated in “Target of Evaluation Security Requirements,” Section 4.2 of the
claimed Protection Profile. The SFRs have been reproduced here for convenience.
Functional
Component ID
Functional Component Name
FDP_IFC.1 (1) Subset information flow control
FDP_IFF.1 (1) Simple security attributes
FDP_IFC.1 (2) Subset information flow control
FDP_IFF.1 (2) Simple security attributes
FDP_ACC.1 Subset access control
FDP_ACF.1 Security attribute based access control
FDP_RIP.1 Subset Residual information protection
FPT_PHP.1 Passive detection of a physical attack
FPT_PHP.3 Resistance to physical attack
FPT_FLS.1 Failure with preservation of secure state
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FPT_TST.1 TSF testing
FTA_CIN_EXT.1 Extended: Continuous Indications
Optional Requirements (Annex F)
FAU_GEN.1 Audit data generation
FIA_UAU.2 User identification before any action
FIA_UID.2 User identification before any action
FMT_MOF.1 Management of security functions behavior
FMT_SMF.1 Specification of Management Functions
FMT_SMR.1 Security roles
Selection based Requirements (Annex G)
FTA_ATH_EXT.1 User authentication device reset
Table 18 - TOE Security Functional Requirements summary
6.1.2 Class: User Data Protection (FDP)
6.1.2.1 User Data Information Flow Requirements
FDP_IFC.1(1) Subset information flow control
Hierarchical to: No other components.
Dependencies: FDP_IFF.1 (1) Simple security attributes
FDP_IFC.1.1(1) The TSF shall enforce the [User Data Protection SFP] on
[Subjects: TOE computer interfaces, TOE peripheral device interfaces
Information: User data transiting the TOE
Operations: Data flow between subjects].
6.1.2.2 Information flow control functions (FDP_IFF)
FDP_IFF.1(1) Simple security attributes
Hierarchical to: No other components.
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Dependencies: FDP_IFC.1 (1) Subset Information Flow Control
FMT_MSA.3 Static attribute initialization
FDP_IFF.1.1(1) The TSF shall enforce the [User Data Protection SFP] based on the following
types of subject and information security attributes:
[Subject: TOE computer interfaces
Subject security attributes: user selected computer interface
Subject: TOE peripheral device interfaces
Subject security attributes: none
Information: User data transiting the TOE
Information security attributes: none].
FDP_IFF.1.2(1) The TSF will permit an information flow between a controlled subject and
controlled information via a controlled operation if the following rules hold:
[The user makes a selection to establish a data flow connection between the
peripheral device interfaces and one computer interface based on the
following rules:
1. The attribute User Selected Computer determines the operation Allowed Data Flow such that
the only permitted data flows are as listed in the table below:
Value of
User
Selected
Computer
Allowed Data Flow
n The ST shall include at least one of the following data-flow claims:
User keyboard peripheral device interface data flowing from peripheral
device interface to computer interface #n;
User mouse peripheral device interface data flowing from peripheral device
interface to computer interface #n;
User display peripheral device interface data flowing from computer
interface #1 to one or more user display peripheral device interfaces;
User authentication peripheral device data flowing bidirectional between
computer interface #n and user authentication device peripheral interface;
and
Analog audio output data flowing from computer interface #n to the audio
peripheral device interface;
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2. When the user changes the attribute by selecting a different computer, this will causes the
TOE to change the data flow accordingly.
3. The specific TOE implementation will allow splitting of the user control to different shared
peripheral groups. For example, the user authentication device selected computer may be
#2, while the keyboard and mouse selected computer device may be #1. In this case, each
selection will be clearly indicated.
4. The TOE supports multiple instances of the peripheral devices shown in the table above, or a
subset of these peripheral devices.]
FDP_IFF.1.3(1) The TSF shall enforce the [the following additional information flow control
SFP rules if the TOE supports user authentication devices:
following an event of the user changing the attribute by selecting a different
computer, the TOE must reset the power to the connected user authentication
device].
FDP_IFF.1.4(1) The TSF shall explicitly authorize an information flow based on the following
rules: [no additional rules].
FDP_IFF.1.5(1) The TSF shall explicitly deny an information flow based on the following rules:
[1. The TSF will deny any information flow between TOE peripheral device
interfaces and TOE non-selected computer interfaces.
2. The TSF shall deny any data flow between an external entity and the TOE
computer interfaces.
3. The TSF shall deny any user data flow between the TOE and an external
entity].
Application Notes:
Note that an external entity is any device that is not part of the evaluated TOE system, its connected
computers or connected peripheral devices.
Therefore, with regard to data flow between the TOE and an external entity:
a. TOE status information such as currently selected computer number or firmware version is not user
data and therefore may be transmitted to other (external) entities;
b. KVM cables, extenders or adapters connected to a TOE computer interface or to a peripheral
interface are not considered external entities and are therefore excluded from this requirement.
6.1.3 Data Isolation Requirements
6.1.3.1 FDP_IFC.1(2) Subset information flow control
Hierarchical to: No other components.
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Dependencies: FDP_IFF.1 (2) Simple security attributes
FDP_IFC.1.1(2) The TSF shall enforce the [Data Isolation SFP] on
[Subjects: TOE computer interfaces, TOE peripheral interfaces
Information: data transiting the TOE
Operations: data flows between computer interfaces].
Application Notes:
The Data Isolation SFP will be enforced on data transiting the TOE wherein this data may be:
a. User data – this is typically text typed by the user on the connected keyboard, but may be other
types of user information, such as display video; and
b. Other data transiting the TOE – a generalized view of data that may be the result of a hostile action
attributable to a threat agent acting from within one or more of the TOE connected computers.
It should be noted that data transiting the TOE does not refer to data generated by the TOE such as TOE
monitoring or control information (for example: user selected computer number or name).
6.1.3.2 Information flow control functions (FDP_IFF)
FDP_IFF.1(2) Simple security attributes
Hierarchical to: No other components.
Dependencies: FDP_IFC.1 (2) Subset Information Flow Control
FMT_MSA.3 Static attribute initialization
FDP_IFF.1.1(2) The TSF shall enforce the [Data Isolation SFP] based on the following types
of subject and information security attributes:
[Subject: TOE interfaces
Subject security attributes: Interface types (Allowed TOE interface types are
listed in Annex C of this PP. Power source and connected computer interfaces
are also applicable interface types.)
Subject: TOE peripheral device interfaces
Subject security attributes: none
Information: data transiting the TOE
Information security attributes: data types. (The TSF shall enforce the data
isolation SFP on the following data types:
a. User keyboard key codes;
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b. User pointing device commands;
c. Video information (User display video data and display management data);
d. Audio output data; and
e. User authentication device data.)].
Application Note:
Note that the following TOE interface protocols are not supported by the TOE:
a. Microphone audio input;
b. DockPort;
c. USB Docking;
d. Thunderbolt; and
e. Other docking protocols.
FDP_IFF.1.2(2) The TSF shall permit an information flow between a controlled subject and
controlled information via a controlled operation if the following rules hold:
[1. During normal TOE operation, the TSF shall permit only user entered
keyboard key codes, and user input mouse commands to flow between the TOE
keyboard and mouse peripheral device interfaces and the TOE selected
computer interface. No flow is permitted between the selected computer
interface and the TOE keyboard and mouse peripheral device interfaces.
2. The TSF shall permit information flow and TSF resources sharing between
two TOE user peripheral interfaces of the same Shared Peripheral group. Both
functions may share the same interface].
Application Notes:
A Shared Peripheral group refers to user peripherals that are switched together as a group. For
example, the user keyboard and user mouse are switched together and are therefore in the same
Shared Peripheral group.
Data flow between the keyboard and the mouse peripheral interfaces is allowed (ports can be
shared or interchangeable).
Normal TOE operation occurs at any time when the TOE is powered on and it is not:
a. Initializing; or
b. In self-test; or
c. Being configured; or
d. In tampered state; or
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e. In self-test failed state.
FDP_IFF.1.3(2) The TSF shall enforce the [No additional rules].
FDP_IFF.1.4(2) The TSF shall explicitly authorize an information flow based on the following
rules: [No additional rules].
FDP_IFF.1.5(2) The TSF shall explicitly deny an information flow based on the following rules:
[1. The TSF shall deny any information flow between TOE Computer Interfaces,
except those allowed by the User Data Flow rules;
2. The TSF shall deny data flow other than keyboard entries and mouse reports
between the TOE keyboard and mouse peripheral device interfaces and the TOE
selected computer interface;
3. The TSF shall deny power flow between the selected computer interface and TOE
keyboard and mouse peripheral device interfaces;
4. The TSF shall deny information flow from the TOE selected computer interface to
the TOE keyboard and mouse peripheral device interface;
5. The TSF shall deny data flow of user authentication device data transiting the TOE
to non-selected TOE computer interfaces;
6. The TSF shall assure that the user authentication device computer interfaces are
not shared with any other TOE peripheral function interface (keyboard, mouse
etc.);
7. The TSF shall deny information flow between two TOE user peripheral interfaces in
different Shared Peripheral groups;
8. The TSF shall deny analog audio information flow between the TOE selected
computer audio interface and the user audio device peripheral interface when a
microphone peripheral device is intentionally or unintentionally connected to
the TOE audio peripheral device interface;
9. The TSF shall enforce unidirectional information flow between the TOE selected
computer audio interface and the user audio device peripheral interface.
Bidirectional information flow shall be denied;
10. The TSF shall deny all AUX Channel information flows other than link negotiation,
link training and EDID reading;
11. The TSF shall deny any information flow from the TOE display peripheral device
interface and the selected computer interface with the exception of EDID
information that may be passed once at TOE power up or after recovery from
TOE reset;
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12. The TSF shall deny an information flow between the selected computer display
interface and the TOE display peripheral device interface on the EDID channel;
13. The TSF shall recognize and enable only those peripherals with an authorized
interface type as defined in Annex C of this PP. Information flow to all other
peripherals shall be denied; and
14. All denied information flows shall also be denied when the TOE’s power source is
removed].
6.1.3.3 Access Control policy (FDP_ACC)
FDP_ACC.1 Subset access control
Hierarchical to: No other components.
Dependencies: FDP_ACF.1 Security attribute based access control
FDP_ACC.1.1 The TSF shall enforce the [peripheral device SFP] on
[Subjects: Peripheral devices
Objects: Console ports
Operations: allow connection, disallow connection].
6.1.3.4 Access control functions (FDP_ACF)
FDP_ACF.1 Security attribute-based access control
Hierarchical to: No other components.
Dependencies: FDP_ACC.1 Subset access control,
FMT_MSA.3 (3) Static attribute initialization.
FDP_ACF.1.1 The TSF will enforce the [peripheral device SFP] to objects based on the
following:
[Subjects: Peripheral devices
Subject security attributes: peripheral device type
Objects: Console ports
Object security attributes: none].
FDP_ACF.1.2 The TSF shall enforce the following rules to determine if an operation
among controlled subjects and controlled objects is allowed: [The TOE shall
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query the connected peripheral device upon initial connection or upon TOE
power up and allow connection for authorized peripheral devices in accordance
with the table in Annex C of the referenced PP].
FDP_ACF.1.3 The TSF shall explicitly authorize access of subjects to objects based on the
following additional rules: [none.].
FDP_ACF.1.4 The TSF shall explicitly deny access of subjects to objects based on the
following additional rules:
[The TOE peripheral device interface (console) port shall reject any peripheral
device with unauthorized values].
6.1.3.5 Residual Information Protection (FDP_RIP)
FDP_RIP.1 Subset Residual information protection
Hierarchical to: No other components.
Dependencies: No dependencies.
FDP_RIP.1.1
FDP_RIP.1.1 [Refinement] The TSF shall ensure that any previous information content of a resource is
made unavailable upon the [
• immediately after TOE switches to another selected computer;
• and on start-up of the TOE for
] the following objects: [a TOE computer interface].
Application Notes:
For additional information refer to the Letter Of Volatility issued by High Sec Labs in Annex C of this
document.
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6.1.4 Class: Protection of the TSF (FPT)
6.1.4.1 Passive Detection of a Physical Attack (FPT_PHP)
FPT_PHP.1 Passive detection of a physical attack
Hierarchical to: No other components.
Dependencies: No dependencies.
FPT_PHP.1.1 The TSF shall provide unambiguous detection of physical tampering that
might compromise the TSF.
FPT_PHP.1.2 The TSF shall provide the capability to determine whether physical tampering
with the TSF's devices or TSF's elements has occurred.
6.1.5 Resistance to Physical Attack
FPT_PHP.3 Resistance to physical attack
Hierarchical to: No other components.
Dependencies: No dependencies.
FPT_PHP.3.1 [Refinement] The TSF will resist [a physical attack on the TOE for the purpose
of gaining access to the internal components, or to damage the anti-tampering
battery] to the [TOE Enclosure] by responding automatically such that the SFRs
are always enforced becoming permanently disabled.
Application Notes:
Since once TOE was tampered, there is no practical way to test or to assure that the various complex
isolation requirements listed above are met, the preferred option is to isolate all peripherals from all
computers completely. For this reason the SFR above was modified to use the stronger requirement of
permanent disabling. Performing this isolation permanently assures that the TOE would not remain in
service after tampering attempt.
6.1.5.1 Failure with Preservation of Secure State (FPT_FLS)
FPT_FLS.1 Failure with preservation of secure state
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Hierarchical to: No other components.
Dependencies: No dependencies.
FPT_FLS.1.1 The TSF will preserve a secure state by disabling the TOE when the following
types of failures occur: [failure of the power on self-test, failure of the anti-
tampering function].
6.1.5.2 TSF Testing (FPT_TST)
FPT_TST.1 TSF testing
Hierarchical to: No other components.
Dependencies: No dependencies.
FPT_TST.1.1 [Refinement] The TSF will run a suite of self-tests that includes as a
minimum:
a. Test of the basic TOE hardware and firmware integrity; and
b. Test of the basic computer-to-computer isolation; and
c. Test of critical security functions (i.e., user control and anti-tampering).
[during initial startup, [upon reset button activation]] to demonstrate the correct
operation of [the TSF].
FPT_TST.1.2 The TSF will provide users with the capability to verify the integrity of [the
TSF functionality].
FPT_TST.1.3 The TSF will provide users with the capability to verify the integrity of [the
TSF].
Application Notes:
The TOE will provide visible user indications in case of Self-test failure through front panel LEDs.
6.1.6 TOE Access (FTA_CIN_EXT)
FTA_CIN_EXT.1 Extended: Continuous Indications
Hierarchical to: No other components.
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Dependencies: No dependencies.
FTA_CIN_EXT.1.1 The TSF will display a continuous visual indication of the computer to which
the user is currently connected, including on power up, [on reset].
6.1.7 F.1.2 Class: Security Audit (FAU)
FAU_GEN.1 Audit data generation
Hierarchical to: No other components.
Dependencies: No dependencies.
FAU_GEN.1.1 The TSF will be able to generate an audit record of the following auditable events:
a) Start-up and shutdown of the audit functions;
b) All auditable events for the [not specified] level of audit; and
c) [administrator login, administrator logout, and [modify TOE user
authentication device filtering (CDF) whitelist and blacklist, perform reset to
factory defaults on TOE, add and remove administrators ]]
FAU_GEN.1.2 The TSF will record within each audit record at least the following information:
a) Date and time of the event, type of event, subject identity (if applicable),
and the outcome (success or failure) of the event; and
b) For each audit event type, based on the auditable event definitions of the
functional components included in the PP/ST, [no other information].
6.1.8 F.1.3 Class: Identification and authentication (FIA)
FIA_UAU.2 User identification before any action
Hierarchical to: FIA_UAU.1 Timing of authentication
Dependencies: FIA_UID.2 User identification before any action
FIA_UAU.2.1 The TSF will require each administrator to be successfully authenticated before
allowing any other TSF-mediated actions on behalf of that user.
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Application Notes:
The Administrator will be authenticated through logon or a specially assigned key before access to
administrative functions is provided by the TOE.
FIA_UID.2 User identification before any action
Hierarchical to: FIA_UID.1 Timing of identification
Dependencies: No dependencies.
FIA_UID.2.1 The TSF will require each administrator to be successfully identified before
allowing any other TSF-mediated actions on behalf of that user.
Application Notes:
The Administrator is identified through logon before access to administrative functions is provided
by the TOE.
6.1.9 Residual Information Protection (FDP_RIP)
FDP_RIP.1 Subset Residual information protection
Hierarchical to: No other components.
Dependencies: No dependencies.
FDP_RIP.1.1(2) The TOE shall have a purge memory or Restore Factory Defaults function
accessible to the user to delete all TOE stored configuration and settings.
6.1.10 F.2.1 Class: Security Management (FMT)
The TOE provides the following management roles:
a. Administrative configuration - Functionality to configure certain aspects of TOE operation that
are not be available to the general user population. Requires administrator identification and
authentication (logon).
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b. User configuration - Functionality to enable user configuration of certain aspects of TOE
operation. Available to all users. No user identification or authentication is required.
6.1.10.1 Management of Functions in TSF (FMT_MOF)
FMT_MOF.1 Management of security functions behavior
Hierarchical to: No other components.
Dependencies: FMT_SMR.1 Security roles; and
FMT_SMF.1 Specification of Management Functions.
FMT_MOF.1.1 The TSF will restrict the ability to [perform] the functions [modify TOE user
authentication device filtering (CDF) whitelist and blacklist, perform reset to
factory defaults on TOE, add and remove administrators] to [the authorized
administrators].
FMT_SMF.1 Specification of Management Functions
Hierarchical to: No other components.
Dependencies: No dependencies.
FMT_SMF.1.1 The TOE shall be capable of performing the following management functions:
a. If the TOE supports configurable user authentication device filtering (CDF), The TOE
shall provide authorized administrators the option to assign whitelist and blacklist
definitions for the TOE user authentication device qualification function
b. [The ability to perform reset to factory defaults on TOE, The ability to add and remove
administrators].
FMT_SMR.1 Security roles
Hierarchical to: No other components.
Dependencies: FIA_UID.1 Timing of identification
FMT_SMR.1.1 The TSF will maintain the roles [users, administrators].
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6.1.11 G.1 - Class FTA_ATH_EXT: User Authentication Device Reset and
Termination
6.1.11.1 G.1.1 User authentication device reset
FTA_ATH_EXT.1 User authentication device reset
Hierarchical to: No other components.
Dependencies: No dependencies.
FTA_ATH_EXT.1.1 The TSF will reset the power supplied to the user authentication device for
at least one second when the user switches the device from one computer to
another.
Application Notes:
It is assumed that the user authentication device is not powered by an external power source.
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6.2 Rationale For TOE Security Requirements
The section below demonstrates the tracing of Security Functional Requirements to Security Objectives
and describes the applicable rationale based on direct reference from the claimed Protection Profile.
6.2.1 TOE Security Functional Requirements Tracing & Rationale
Objective SFRs TOE shall comply with
SFRs / Not applicable
[O.COMPUTER_INTERFACE_ISOLATION] FDP_IFC.1(1)
FDP_IFF.1(1)
TOE shall comply with
SFRs.
[O.COMPUTER_INTERFACE_ISOLATION_TOE_UNPOWERED] FDP_IFC.1(1)
FDP_IFF.1(1)
TOE shall comply with
SFRs.
[O.USER_DATA_ISOLATION] FDP_IFC.1(1)
FDP_IFF.1(1)
TOE shall comply with
SFRs.
[O.NO_USER_DATA_RETENTION] FDP_RIP.1 TOE shall comply with
SFRs.
[O.PURGE_TOE KB_DATA_WHILE_SWITCHING] FDP_RIP.1 TOE shall comply with
SFRs.
[O.NO_DOCKING_PROTOCOLS] FDP_IFC.1(1)
FDP_IFF.1(1)
TOE shall comply with
SFRs.
[O.NO_OTHER_EXTERNAL_INTERFACES] FDP_IFC.1(2)
FDP_IFF.1. (2)
TOE shall comply with
SFRs.
[O.NO_ANALOG_AUDIO_INPUT] FDP_IFC.1(1)
FDP_IFF.1(1)
TOE shall comply with
SFRs.
[O.UNIDIRECTIONAL_AUDIO_OUT] FDP_IFC.1(1)
FDP_IFF.1(1)
TOE shall comply with
SFRs.
[O.COMPUTER_TO_AUDIO_ISOLATION] FDP_IFC.1(1)
FDP_IFF.1(1)
TOE shall comply with
SFRs.
[O.USER_AUTHENTICATION_ISOLATION] FDP_IFC.1(1)
FDP_IFF.1(1)
TOE shall comply with
SFRs.
[O.USER_AUTHENTICATION_RESET] FDP_IFF.1. (1)
FTA_ATH_EXT.1
TOE shall comply with
SFRs.
[O.USER_AUTHENTICATION_ADMIN] FMT_SMF.1 b
FMT_MOF.1
FMT_SMR.1
TOE shall comply with
SFRs.
[O.AUTHORIZED_SWITCHING] FDP_IFC.1(2)
FDP_IFF.1(2)
TOE shall comply with
SFRs.
[O.NO_AMBIGUOUS_CONTROL] FDP_IFC.1(2)
FDP_IFF.1(2)
TOE shall comply with
SFRs.
[O.CONTINUOUS_INDICATION] FTA_CIN_EXT.1 TOE shall comply with
SFRs.
[O.KEYBOARD_AND_MOUSE_TIED] FDP_ACC.1
FDP_ACF.1
TOE shall comply with
SFRs.
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[O.NO_CONNECTED_COMPUTER_CONTROL] FDP_IFC.1(1)
FDP_IFF.1(1)
TOE shall comply with
SFRs.
[O.PERIPHERAL_PORTS_ISOLATION] FDP_IFC.1(1)
FDP_IFF.1(1)
TOE shall comply with
SFRs.
[O.DISABLE_UNAUTHORIZED_PERIPHERAL] FDP_ACC.1
FDP_ACF.1
TOE shall comply with
SFRs.
[O.DISABLE_UNAUTHORIZED_ENDPOINTS] FDP_ACC.1
FDP_ACF.1
TOE shall comply with
SFRs.
[O.KEYBOARD_MOUSE_EMULATED] FDP_ACC.1
FDP_ACF.1
TOE shall comply with
SFRs.
[O.KEYBOARD_MOUSE_UNIDIRECTIONAL] FDP_ACC.1
FDP_ACF.1
TOE shall comply with
SFRs.
[O.UNIDIRECTIONAL_VIDEO] FDP_IFC.1(1)
FDP_IFF.1(1)
TOE shall comply with
SFRs.
[O.UNIDIRERCTIONAL_EDID] FDP_IFC.1(1)
FDP_IFF.1(1)
TOE shall comply with
SFRs.
[O.NO_TOE_ACCESS] FPT_PHP.3
FPT_FLS.1
TOE shall comply with
SFRs.
[O.TAMPER_EVIDENT_LABEL] FPT_PHP.1 TOE shall comply with
SFRs.
[O.ANTI_TAMPERING] FPT_PHP.3 TOE shall comply with
SFRs.
[O.ANTI_TAMPERING_BACKUP_POWER] FPT_PHP.3 TOE shall comply with
SFRs.
[O.ANTI_TAMPERING_BACKUP_FAIL_TRIGGER] FPT_PHP.3 TOE shall comply with
SFRs.
[O.ANTI_TAMPERING_INDICATION] FPT_PHP.1 TOE shall comply with
SFRs.
[O.ANTI_TAMPERING_PERMANENTLY_DISABLE_TOE] FPT_PHP.3
FPT_FLS.1
TOE shall comply with
SFRs.
[O.SELF_TEST] FPT_TST.1 TOE shall comply with
SFRs.
[O.SELF_TEST_FAIL_TOE_DISABLE] FPT_TST.1
FPT_FLS.1
TOE shall comply with
SFRs.
[O.SELF_TEST_FAIL_INDICATION] FPT_TST.1 TOE shall comply with
SFRs.
Table 19- SFR and Security Objectives Mapping with TOE compliance requirements
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Objective SFR Rationale
[O.COMPUTER_INTERFACE_ISOLATION]
The TOE must prevent unauthorized data
flow to assure that the TOE and/or its
connected peripheral devices would not be
exploited in an attempt to leak data. The
TOE computer interface shall be isolated
from all other TOE computer interfaces while
TOE is powered.
FDP_IFC.1(1) FDP_IFC.1(1) and FDP_IFF.1(1) satisfies the
“Computer interface isolation” objective by
enforcing the user data protection SFP. This
policy defines the allowed and disallowed data
flows between peripheral and computer
interfaces. It is specifically disallowing any data
flow between different computer interfaces.
FDP_IFF.1(1)
[O.COMPUTER_INTERFACE_ISOLATION_TOE
_UNPOWERED]
The same level of isolation defined in the
dataflow objectives must be maintained at
all times, including periods while TOE is
unpowered.
FDP_IFC.1(1) FDP_IFC.1(1) and FDP_IFF.1(1) satisfies the
“Computer interface isolation TOE unpowered”
objective by further enforcing the user data
protection SFP even when the TOE is
unpowered. This policy defines the allowed and
disallowed data flows between peripheral and
computer interfaces. It is specifically disallowing
any data flow between different computer
interfaces when TOE is unpowered. Also see in
FDP_IFF.1.5(2), Denied data flow rule #14 that
defines the data isolation requirements while
TOE is unpowered.
FDP_IFF.1(1)
[O.USER_DATA_ISOLATION]
User data such as keyboard entries should
be switched (i.e., routed) by the TOE only to
the computer selected by the user.
The TOE must provide isolation between the
data flowing from the peripheral device to
the selected computer and any non-selected
computer.
FDP_IFC.1(1) FDP_IFC.1(1) and FDP_IFF.1(1) satisfies the
“Computer interface isolation” objective by
enforcing the user data protection SFP. This
policy defines the allowed and disallowed data
flows between peripheral and computer
interfaces. It is specifically allowing data flow
from peripheral device to the selected
computer. It is specifically disallowing data flow
from peripheral device to non-selected
computer and therefore it satisfying the user
data isolation objective.
FDP_IFF.1(1)
[O.NO_USER_DATA_RETENTION]
The TOE shall not retain user data after it is
powered down.
FDP_RIP.1 FDP_RIP.1 satisfies the “No user data retention”
objective by preventing TOE from storing user
data on non-volatile memory.
[O.PURGE_TOE
KB_DATA_WHILE_SWITCHING]
The TOE shall purge all user keyboard data
from computer interfaces following channel
switching and before interacting with the
new connected computer.
FDP_RIP.1 FDP_RIP.1 satisfies the “Purge TOE keyboard
data while switching “objective by enforcing the
requirement that during TOE power up and new
computer selection, user data in the TOE will be
deleted.
[O.NO_DOCKING_PROTOCOLS]
The use of docking protocols such as
FDP_IFC.1(1) FDP_IFC.1(1) and FDP_IFF.1(1) satisfies the “No
docking protocols” objective by defining the
allowed and disallowed TOE interface protocols.
FDP_IFF.1(1)
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DockPort, USB docking, Thunderbolt etc. is
not allowed in the TOE.
Docking protocols are specifically disallowed by
these SFRs application note.
[O.NO_OTHER_EXTERNAL_INTERFACES]
The TOE may not have any wired or wireless
external interface with external entities
(external entity is an entity outside the TOE
evaluated system, its connected computers
and peripheral devices).
FDP_IFC.1(2) FDP_IFC.1(2) and FDP_IFF.1. (2) Satisfies the
“No other external interfaces” objectives by
enforcing the “Data isolation SFP” on the TOE
external interfaces. More specifically the TSF
shall deny any data flow between an external
entity and the TOE computer interfaces. In
addition it requires that the TSF shall deny any
user data flow between the TOE and an
external entity. The exclusion of other external
interfaces prevents these unauthorized data
flows.
FDP_IFF.1. (2)
[O.NO_ANALOG_AUDIO_INPUT]
Shared audio input peripheral functions (i.e.,
analog audio microphone input or line input)
are not allowed in the TOE.
FDP_IFC.1(1) The FDP_IFC.1(1) and FDP_IFF.1(1) satisfies the
“No analog audio input” objective by requiring
the TOE would specifically not support analog
audio input (microphone in or line in). The SFR
defined positive (allowed) interfaces. The
specific requirement appears in the application
note paragraph a. Also see in FDP_IFF.1.5(2),
Denied data flow rule #13 that refers to Annex
C of the PP.
FDP_IFF.1(1)
[O.UNIDIRECTIONAL_AUDIO_OUT]
The TOE shall be designed to assure that
reverse audio signal attenuation will be at
least 30 dBv measured with 200 mV and 2V
input pure sine wave at the extended audio
frequency range including negative swing
signal. The level of the reverse audio signal
received by the selected computer shall be
minimal to assure that the signal level
generated by headphones will be well under
the noise floor level.
FDP_IFC.1(1) The FDP_IFC.1(1) and FDP_IFF.1(1) satisfies the
“Unidirectional audio out” objective by defining
in FDP_IFF.1.5(2),Denied data flow rule #9 that
the audio shall be enforced to unidirectional
flow from the computer interface to the
peripheral device interface only. The objective
testing methodology and isolation targets are
defined in the appropriate assurance activities
for that SFR.
FDP_IFF.1(1)
[O.COMPUTER_TO_AUDIO_ISOLATION]
The audio data flow shall be isolated from all
other TOE functions. Signal attenuation
between any TOE computer interface and
any TOE audio interface shall be at least 45
dBv measured with 2V input pure sine wave
at the extended audio frequency range
including negative swing signal.
FDP_IFC.1(1) The FDP_IFC.1(1) and FDP_IFF.1(1) satisfies the
“Computer to audio isolation” objective by
defining in FDP_IFF.1.5(2), Denied data flow
rule #1 that The TSF shall deny any information
flow between TOE Computer Interfaces, except
those allowed by the User Data Flow rules.
Audio to other functions data flow is specifically
not authorized by the same SFR.
The objective testing methodology and isolation
targets are defined in the appropriate
assurance activities for that SFR.
FDP_IFF.1(1)
[O.USER_AUTHENTICATION_ISOLATION] FDP_IFC.1(1) The FDP_IFC.1(1) and FDP_IFF.1(1) satisfies the
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The user authentication function shall be
isolated from all other TOE functions.
FDP_IFF.1(1)
“User authentication isolation” objective by
defining in FDP_IFF.1.5(2), Denied data flow
rule #6 defining that the TSF shall assure that
the user authentication device computer
interfaces are not shared with any other TOE
peripheral function interface (keyboard, mouse
etc.).
[O.USER_AUTHENTICATION_RESET]
Unless the TOE emulating the user
authentication function, upon switching
computers, the TOE shall reset (turn off and
then turn on) the power supplied to the user
authentication device for at least 1 second.
FDP_IFF.1(1) FDP_IFF.1(1) satisfying the User authentication
reset” objective by setting the requirement in
FDP_IFF.1.3(1) that the TSF shall enforce the
rule:” If the TOE user authentication device
function is not emulated - following an event of
the user changing the attribute by selecting a
different computer, the TOE must reset the
power to the connected user authentication
device”
FTA_ATH_EXT.1 The extended requirement FTA_ATH_EXT.1
satisfies the “User authentication reset”
objective by setting the requirement that the
TSF shall reset the power supplied to the user
authentication device for at least one second
when the user switches the device from one
computer to another.
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[O.USER_AUTHENTICATION_ADMIN]
If the TOE is capable of being configured
after deployment with user authentication
device qualification parameters then such
configuration may only performed by an
administrator.
FMT_SMF.1 b FMT_SMF.1 satisfies the “User authentication
admin” objective by setting the requirement
that the TOE shall be capable of performing the
following management functions:
a. If the TOE is capable of being configured
after deployment with user authentication
device qualification parameters then such
configuration may only performed by an
administrator.
b. TOE may provide any additional TOE
management functions.
FMT_MOF.1 FMT_MOF.1 defines the rule that the TSF shall
restrict the ability to perform the functions
modify TOE user authentication device filtering
(CDF) whitelist and blacklist to the authorized
administrators and therefore limiting the access
to this function to authenticated administrators
only.
FMT_SMR.1 FMT_SMR.1 defines the rule that the TSF shall
maintain the roles users, and administrators.
This role must be defined in order to enable it
to perform administrative functions.
[O.AUTHORIZED_SWITCHING]
The TOE shall allow only authorized
switching mechanisms to switch between
connected computers and shall explicitly
prohibit or ignore unauthorized switching
mechanisms.
FDP_IFC.1(2) The assurance activities for FDP_IFC.1(2) and
FDP_IFF.1(2) requires that the evaluator will
examine the TOE to verify that it supports only
authorized switching methods. In particular the
evaluator shall verify that the TOE does not
receive channel switching commands from
keyboard shortcuts.
FDP_IFF.1(2)
[O.NO_AMBIGUOUS_CONTROL]
If the TOE allows more than one authorized
switching mechanism, only one method shall
be operative at any given time to prevent
ambiguous commands.
FDP_IFC.1(2) FDP_IFF.1(2)-2 requires that the user will use
one selection mechanism (and only one) to
select the connected computer value n.
Multiple user selection mechanisms would
violate the “No ambiguous control” objective.
FDP_IFF.1(2)
[O.CONTINUOUS_INDICATION]
The TOE shall provide continuous visual
indication of the computer to which the user
is currently connected.
FTA_CIN_EXT.1 The FTA_CIN_EXT.1 extended requirement
satisfies the “Continuous indication” objective
by enforcing that the TOE shall display a
continuous visual indication of the computer to
which the user is currently connected, including
on power up.
[O.KEYBOARD_AND_MOUSE_TIED]
The TOE shall ensure that the keyboard and
mouse devices are always switched together
FDP_ACC.1 FDP_ACC.1 enables positive identification of the
keyboard and mouse peripheral devices are
connected to the TOE keyboard and mouse
ports and therefore assure that when these two
ports are switched, it would be the keyboard
and the mouse that will be tied together and
not any other USB device.
FDP_ACF.1 FDP_IFF.1.2(2) application note stating (as an
example) that the keyboard and mouse
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functions must be in the same SPF and
therefore must be switched together.
[O.NO_CONNECTED_COMPUTER_CONTROL]
The TOE shall not allow TOE control through
a connected computer.
FDP_IFC.1(1) FDP_IFF.1.2(1) requires that the user makes a
selection to establish a data flow connection
between the peripheral device interfaces and
one computer interface… This requirement
indirectly satisfying the “No connected
computer control” objective by prohibiting TOE
channel selection by a connected computer that
may have automated selection or may be
controlled by a different user.
FDP_IFF.1(1)
[O.PERIPHERAL_PORTS_ISOLATION]
The TOE shall prevent data flow between
peripheral devices of different SPFs and the
TOE peripheral device ports of different SPFs
shall be isolated.
FDP_IFC.1(1) The FDP_IFC.1(1) and FDP_IFF.1(1) satisfies the
“Peripheral ports isolation” objective by
defining in FDP_IFF.1.5(2), Denied data flow
rule #1 defining that the TOE shall deny any
information flow between TOE Computer
Interfaces, except those allowed by the User
Data Flow rules explicitly defined in other data
flow rules by the SFR.
FDP_IFF.1(1)
[O.DISABLE_UNAUTHORIZED_PERIPHERAL]
The TOE shall only allow authorized
peripheral device types (See Annex C) per
peripheral device port; all other devices shall
be identified and then rejected or ignored by
the TOE.
FDP_ACC.1 FDP_ACC.1 satisfies the “Disable unauthorized
peripheral” objective by enforcing the
“peripheral device SFP” on the TOE console
ports. This policy enables the TOE to either
allow connection, or disallow connection of
console port connected peripheral device based
on the rules defined in FDP_ACF.1 SFR below.
FDP_ACF.1 FDP_ACF.1.4 satisfies the “Disable unauthorized
peripheral device” objective by enforcing the
following SFP rule: The TOE peripheral device
interface (console) port shall reject any
peripheral device with unauthorized values.
[O.DISABLE_UNAUTHORIZED_ENDPOINTS]
The TOE shall reject unauthorized peripheral
devices connected via a USB hub.
Alternatively, the TOE may reject all USB
hubs.
FDP_ACC.1 FDP_ACC.1 satisfies the “Disable unauthorized
endpoints” objective by enforcing the
“peripheral device SFP” on the TOE console
ports. This policy enables the TOE to either
allow connection, or disallow connection of
console port connected peripheral device based
on the rules defined in FDP_ACF.1 SFR below.
FDP_ACF.1 FDP_ACF.1.4 satisfies the “Disable unauthorized
endpoints” objective by enforcing the following
SFP rule: The TOE peripheral device interface
(console) port shall reject any peripheral device
with unauthorized values.
FDP_ACF.1.2 further requires that: “The TOE
shall query the connected peripheral device
upon initial connection or upon TOE power up
and allow connection for authorized peripheral
devices in accordance with the table in Annex C
of this PP”. Annex C of the PP specifically
defining the rules regarding USB endpoints:
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USB hub and composite devices are allowed if:
The PSS can filter USB endpoints; and
At least one endpoint is a keyboard or mouse
HID class; and
All other endpoints are disabled.
[O.KEYBOARD_MOUSE_EMULATED]
The TOE keyboard and pointing device
functions shall be emulated (i.e., no
electrical connection other than the
common ground is allowed between
peripheral devices and connected
computers).
FDP_ACC.1 FDP_ACC.1 partially satisfying the “Keyboard
and mouse emulated” objective by enforcing
qualification rules on the peripheral devices
connected to the TOE keyboard and mouse
console ports. Such rules are essential in order
to assure that the device connected (and
emulated), are actually the keyboard and
mouse and no other USB devices.
FDP_ACF.1 FDP_ACF.1 satisfies the “Keyboard and mouse
emulated” objective by setting the requirement
that the TOE peripheral device interface
(console) port shall reject any peripheral device
with unauthorized values. The qualification of
the connected keyboard and mouse device
requires that the host function will be
emulated. Furthermore, FDP_IFF.1.5(2) rule #2
requires that the TSF shall deny data flow other
than keyboard entries and mouse reports
between the TOE keyboard and mouse
peripheral device interfaces and the TOE
selected computer interface. This requirement
can only be fulfilled if the keyboard and mouse
emulated objective is met.
[O.KEYBOARD_MOUSE_UNIDIRECTIONAL]
The TOE keyboard and pointing device data
shall be forced to unidirectional flow from
the peripheral device to the switched
computer only.
FDP_IFC.1(1) The FDP_IFC.1(1) and FDP_IFF.1(1) satisfies the
“Keyboard and mouse unidirectional” objective
by defining in FDP_IFF.1.5(2), Denied data flow
rules #3 and #4 that the TOE shall enforce
unidirectional data flow from the keyboard and
mouse peripheral device interfaces and the
computer interface to the peripheral device
interface. The prevention of power flow
support the option that power modulation by
computer will be used to signal data across the
TOE.
FDP_IFF.1(1)
[O.UNIDIRECTIONAL_VIDEO]
TOEs that support VGA, DVI or HDMI video
shall force native video peripheral data (i.e.,
red, green, blue, and TMDS lines) to
unidirectional flow from the switched
computer to the connected display device.
FDP_IFC.1(1) The FDP_IFC.1(1) and FDP_IFF.1(1) satisfies the
“Unidirectional video” objective by defining in
FDP_IFF.1.5(2), Denied data flow rule #11 that
the TOE shall enforce unidirectional data flow
from the computer video interface to the
display interface only.
FDP_IFF.1(1)
[O.UNIDIRERCTIONAL_EDID]
TOEs that support VGA, DVI, DisplayPort or
HDMI video shall force the display EDID
peripheral data channel to unidirectional
flow and only copy once from the display to
FDP_IFC.1(1) The FDP_IFC.1(1) and FDP_IFF.1(1) satisfies the
“Unidirectional EDID” objective by defining in
FDP_IFF.1.5(2), Denied data flow rule #11 that
the TOE shall enforce unidirectional data flow
from the computer video interface to the
FDP_IFF.1(1)
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each one of the appropriate computer
interfaces during the TOE power up or
reboot sequence. The TOE must prevent any
EDID channel write transactions initiated by
connected computers.
display interface with the exception of EDID
that may be copied from display to computer
interfaces once during TOE power up.
[O.NO_TOE_ACCESS]
The TOE shall be physically enclosed so that
any attempts to open or otherwise access
the internals or modify the connections of
the TOE would be evident. This shall be
accomplished through the use of an always-
on active anti-tampering system that serves
to permanently disable the TOE should its
enclosure be opened.
FPT_PHP.3 FPT_PHP.3 requires that the TOE will actively
resist a physical attack for the purpose of
gaining access to the internal components, or to
damage the anti-tampering battery by causing
the TOE to become permanently disabled.
FPT_FLS.1 FPT_FLS.1 requires that a failure of the TOE
anti-tampering function would cause the TOE to
become permanently disabled. This
requirement is critical in order to assure that a
TOE with potential physical tampering would
not continue to be used.
[O.TAMPER_EVIDENT_LABEL]
The TOE shall be identifiable as authentic by
the user and the user must be made aware
of any procedures or other such information
to accomplish authentication. This feature
must be available upon receipt of the TOE
and continue to be available during the TOE
deployment.
The TOE shall be labeled with at least one
visible unique identifying tamper-evident
marking that can be used to authenticate the
device. The TOE manufacturer must
maintain a complete list of manufactured
TOE articles and their respective
identification markings’ unique identifiers.
FPT_PHP.1 FPT_PHP.1 requires that the TOE will have an
unambiguous detection of physical tampering
that might compromise the TSF. Furthermore it
requires that the TOE shall provide the
capability to determine whether physical
tampering with the TSF's devices or TSF's
elements has occurred. One or more Tamper
Evident Labels located in critical locations on
the TOE enclosure would satisfy this SFR and
objective.
[O.ANTI_TAMPERING]
The TOE shall use an always-on active anti-
tampering system to permanently disable
the TOE in case physical tampering is
detected.
FPT_PHP.3 FPT_PHP.3 satisfies the anti-tampering
objective by requiring that the TOE will be
equipped with a function that would actively
resist a physical attack for the purpose of
gaining access to the internal components.
[O.ANTI_TAMPERING_BACKUP_POWER]
The anti-tampering system must have a
backup power source to enable tamper
detection while the TOE is unpowered.
FPT_PHP.3 FPT_PHP.3 satisfies the anti-tampering backup
power source objective by requiring that the
TOE anti-tampering function will be always on
(even when the TOE is unpowered).
[O.ANTI_TAMPERING_BACKUP_FAIL_TRIGGE
R]
A failure or depletion of the anti-tampering
system backup power source shall trigger
TOE to enter tampered state.
FPT_PHP.3 FPT_PHP.3 satisfies the anti-tampering backup
power source failure objective by requiring that
the TOE anti-tampering function will trigger the
anti-tampering if it detected that the backup
power source has failed.
[O.ANTI_TAMPERING_INDICATION]
The TOE shall have clear user indications
when tampering is detected.
FPT_PHP.1 FPT_PHP.1 satisfies the anti-tampering
triggering indications objective by requiring that
the TOE shall provide the capability to
determine whether physical tampering with the
TSF's devices or TSF's elements has occurred.
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[O.ANTI_TAMPERING_PERMANENTLY_DISAB
LE_TOE]
Once the TOE anti-tampering is triggered,
the TOE shall become permanently disabled.
No peripheral-to-computer data flows shall
be allowed.
FPT_PHP.3 FPT_PHP.3.1 satisfies the “Anti-tampering
permanently disables TOE” objective by setting
the requirement that the TSF shall resist a
physical attack …. by TOE becoming
permanently disabled.
FPT_FLS.1 FPT_FLS.1 requiring that once anti-tampering
function was triggered, as a minimum, no
peripheral device is connected to any
computer.
[O.NO_TOE_ACCESS]
The TOE shall be designed so that access to
the TOE firmware, software, or its memory
via its accessible ports is prevented.
FPT_PHP.3 FPT_PHP.3 satisfies the “No TOE access”
objective by requiring that TOE will be equipped
with an always-on active anti-tampering
function that prevent external access to the
TOE programming ports.
FPT_FLS.1 adds to the previous SFR the
assurance that in case of an anti-tampering
backup power source failure, the anti-
tampering function will be triggered.
FPT_FLS.1
[O.SELF_TEST]
The TOE shall perform self-tests following
power up or powered reset.
FPT_TST.1 FPT_TST.1 SFR defines the TOE self-testing
coverage and schedule (before every power up
cycle).
[O.SELF_TEST_FAIL_TOE_DISABLE]
Upon critical failure detection the TOE shall
disable normal operation of the whole TOE
or the respective failed component.
FPT_TST.1 FPT_TST.1 SFR defines the expected result in
case of self-test failure – TOE shall become
disabled. All inputs shall be isolated from all
outputs.
FPT_FLS.1 FPT_FLS.1 requires that failure of the TOE
power on self-test, failure of the anti-tampering
function will cause at least isolation of the
peripheral devices and connected computers to
preserve secure state.
[O.SELF_TEST_FAIL_INDICATION]
The TOE shall provide clear and visible user
indications in the case of a self-test failure.
FPT_TST.1 FPT_TST.1 requires that TOE will provide proper
user indications in case of self-test failure.
Table 20 - Objective to SFRs Rationale
6.3 Rationale for IT Security Requirement Dependencies
This section includes a table of all the security functional requirements and their dependencies and a
rationale for any dependencies that are not satisfied.
SFR Dependencies Dependency Satisfied/Rationale
FDP_IFC.1 (1) FDP_IFF.1 (1) Yes
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SFR Dependencies Dependency Satisfied/Rationale
FDP_IFF.1 (1) FDP_IFC.1 (1) Yes
FMT_MSA.3 No
FDP_IFC.1 (2) FDP_IFF.1 (2) Yes
FDP_IFF.1 (2) FDP_IFC.1 (2) Yes
FMT_MSA.3(1) No
FDP_ACC.1 FDP_ACF.1 Yes
FDP_ACF.1 FDP_ACC.1 Yes
FMT_MSA.3(3) No
FDP_RIP.1 none Not applicable
FPT_PHP.1 none Not applicable
FPT_PHP.3 none Not applicable
FPT_FLS.1 none Not applicable
FPT_TST.1 none Not applicable
FTA_CIN_EXT.1 none Not applicable
Optional Requirements (Annex F)
FAU_GEN.1 none Not applicable
FIA_UAU.2 FIA_UID.1 Satisfied by FIA_UID.2
FIA_UID.2 none Not applicable
FMT_MOF.1 FMT_SMR.1 Yes
FMT_SMF.1 Yes
FMT_SMF.1 none Not applicable
FMT_SMR.1 FIA_UID.1 Satisfied by FIA_UID.2
Selection based Requirements (Annex G)
FTA_ATH_EXT.1 none Not applicable
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Table 21 - SFR Dependencies satisfied
6.4 Dependencies Not Met
6.4.1 FMT_MSA.3 - Static attribute initialization
The security attributes associated with the Data Isolation Security Function Policy (SFP) are limited to
the interface types and data types. The interface type is determined by the type of peripheral device
attached to the TOE, and the data type is determined by that interface. These attributes are not subject
to security management. Therefore, this SFR and its dependent Security management SFRs, are not
appropriate for this TOE type.
6.4.2 FMT_MSA.3(1) and FMT_MSA.3(3) - Static attribute initialization
The security attributes associated with the User Data Protection SFP are limited to the user selected
computer interface. The value is user selected and not subject to security management. Therefore, this
SFR and its dependent Security management SFRs, are not appropriate for this TOE type.
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6.5 Security Assurance Requirements
The table below is provides a list of claimed assurance components for each class.
Assurance Class Assurance
Component ID
Assurance Components Description
Development ADV_FSP.1 Basic Functional Specification
Guidance Documents AGD_OPE.1 Operational user guidance
AGD_PRE.1 Preparative user guidance
Tests ATE_IND.1 Independent testing - conformance
Vulnerability
Assessment
AVA_VAN.1 Vulnerability analysis
Life Cycle Support ALC_CMC.1 Labeling of the TOE
ALC_CMS.1 TOE CM coverage
Table 22 - SAR list
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7 TOE Summary Specification
This section presents an overview of the security functions implemented by the TOE and the Assurance
Measures applied to ensure their correct implementation.
7.1 TOE keyboard and mouse security functions
The TOE implements the Data Separation Security Function Policy (SFP) as outlined in Section 4 of the
claimed Protection Profile.
Figure 7 – Simplified block diagram of 2-Port KVM TOE
The TOE keyboard and mouse data flow path design is based on the following features (refer to figure 7
above for components location):
a. Isolated keyboard and mouse USB device emulators per connected computer to prevent direct
interface between the TOE shared peripheral devices and connected computers. Device
Emulators are microcontrollers that receive serial stream representing the keyboard and mouse
commands on one side and interact with connected computer via USB bus on the other side.
The use of isolated device emulator (one per computer) assures that connected computers will
not interact electrically or logically with shared TOE or peripheral resources.
b. Each device emulator is powered by its own connected computer. Power domains of different
computer interfaces are independent and isolated behind unidirectional data diodes.
c. TOE uses host (computer) emulators to interface with connected keyboard and mouse
peripheral devices, thus isolating external peripherals from TOE internal circuitry and from
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connected computers. An attempt of connected computer to target shared peripheral device or
internal TOE circuitry must defeat first these host and device emulators.
d. Data exchange from host emulators to device emulators is limited to basic HID transactions
through the use of limited serial protocol between TOE host emulators and device emulators.
No other data may flow between emulators as it is not supported by the limited protocol.
e. Optical data diodes to enforce unidirectional data flow of serial data between TOE host
emulators and device emulators. Optical data diodes are located before each device emulator
channel to assure that each channel is completely isolated (electrically and logically) from other
channel or from other TOE functions. No data flow is possible between the device emulators
(connected computers) and host interfaces (peripheral devices).
f. Multiplexer (Peripheral switch) to enable selection of just one keyboard / mouse serial data
source at any given time. Note that in the TOE this multiplexer is 3 positioned – third position is
isolation (not connected). The third position is used when TOE is tampered or when self-test has
failed to disable the keyboard and mouse stream.
g. Keyboard and mouse data flow is not combined or connected to any other TOE data flow. The
keyboard and mouse functions are completely isolated from all other functions (audio, video
etc.). There are no shared microcontrollers or any other electronic components. No other
external interfaces are coupled to the keyboard and mouse data flow paths.
h. Keyboard and mouse are always switched together in the TOE. There is no administrator or user
configuration that enables control split between keyboard and mouse functions.
i. Keyboard and mouse host emulators can only enumerate USB HID (Human Interface Devices).
No other devices or endpoints are supported.
j. If connected device will attempt to enumerate as different devices in different time – the TOE
will not enumerate the device at all. All other devices / endpoints will be rejected by the TOE.
Bad USB or manipulated composite devices will be rejected by the TOE keyboard and mouse
interface ports.
k. When the TOE is powered off, the optical data diodes are powered off and therefore no data
flow is possible between the keyboard and mouse peripheral devices and computer interfaces.
l. During TOE switching from one computer to another, the system controller function assures
that the keyboard and mouse stacks are deleted and that the first 100 milliseconds of
commands received from the keyboard after switching are ignored (deleted). This is done to
delete keyboard microcontroller buffer accumulation of cached commands from previous
channel.
m. Keyboard LEDs are supported by local TOE indications but not through the keyboard embedded
LEDs. Keyboard traffic is unidirectional but device emulators can detect each individual
computer state and pass this information via secure multiplexer to the TOE front panel LEDs.
n. USB hub and composite devices are authorized as all evaluated TOE can filter USB endpoints;
Note that devices having integrated USB hub and composite devices will be supported by the
TOE only if the connected device has at least one endpoint which is a keyboard or mouse HID
class; In such case the TOE will disable all other endpoints.
o. Wireless keyboards are not allowed per applicable user guidance.
p. Wireless mice are not allowed per applicable user guidance.
q. TOE Keyboard and mouse USB console ports are interchangeable.
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This keyboard / mouse peripheral data path design provides the level of assurance that is required by
the referenced PP.
The above features assure that the TOE satisfies the following PP objectives and security functional
requirements:
i. [O.COMPUTER_INTERFACE_ISOLATION]  FDP_IFC.1(1) and FDP_IFF.1(1) (limited to keyboard
and mouse data flows).
ii. [O.COMPUTER_INTERFACE_ISOLATION_TOE_UNPOWERED]  FDP_IFC.1(1) and FDP_IFF.1(1)
(limited to keyboard and mouse data flows).
iii. [O.USER_DATA_ISOLATION]  FDP_IFC.1(1) and FDP_IFF.1(1) (limited to keyboard and
mouse data flows).
iv. [O.KEYBOARD_AND_MOUSE_TIED]  FDP_ACC.1 and FDP_ACF.1.
v. [O.PERIPHERAL_PORTS_ISOLATION]  FDP_IFC.1(1) and FDP_IFF.1(1) (limited to keyboard
and mouse data flows).
vi. [O.DISABLE_UNAUTHORIZED_PERIPHERAL]  FDP_ACC.1 and FDP_ACF.1 (limited to
keyboard and mouse data flows).
vii. [O.DISABLE_UNAUTHORIZED_ENDPOINTS]  FDP_ACC.1 and FDP_ACF.1 (limited to
keyboard and mouse data flows).
viii. [O.KEYBOARD_MOUSE_EMULATED]  FDP_ACC.1 and FDP_ACF.1.
ix. [O.KEYBOARD_MOUSE_UNIDIRECTIONAL]  FDP_ACC.1 and FDP_ACF.1.
Keyboard user data is not stored on TOE non-volatile memory. All USB stacks are implemented in the
TOE using SRAM (Static Random Access Memory) – a volatile memory that clears data once TOE is
powered down.
The above features assure that the TOE satisfies the following PP objectives and security functional
requirements:
i. [O.NO_USER_DATA_RETENTION]  FDP_RIP.1 (limited to keyboard and mouse data).
ii. [O.PURGE_TOE KB_DATA_WHILE_SWITCHING]  FDP_RIP.1.
7.2 TOE external interface security functions
a. The TOE supports only the following external interfaces protocols (as required by referenced
PP):
• USB keyboard and mouse;
• Analog audio output;
• User authentication device or other assigned USB devices (TOE model specific);
• Power (AC or DC); and
• Video (DVI, HDMI, DisplayPort video only);
b. The TOE audio out switching includes a unidirectional data flow diode to assure that
microphone would not be supported. Audio data is forced to flow only from the selected
connected computer to the user peripheral device. Audio data from connected peripheral
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device back to connected computer is blocked by the audio data diodes. There are two diodes in
parallel to handle right side and left side audio signals (stereo).
c. Microphone bias is blocked by the TOE audio path to disable electrets microphone if connected
to computer microphone input interface. The TOE does not support docking protocols. It does
not support analog microphone or audio line inputs.
The below tables maps allowed peripheral devices to TOE console ports based on its respective protocol.
TOE Console
Port
Authorized Devices Authorized Protocols
Keyboard • Any wired keyboard and keypad
without internal USB hub or
composite device functions;
• USB hub and composite devices
are allowed as TOE can filter USB
endpoints (if at least one
endpoint is a keyboard or mouse
HID class). In such case TOE will
disable all other endpoints;
• Wireless keyboards are not
allowed;
• PS/2 to USB adapter; and
• Barcode reader.
• USB
Mouse /
Pointing
device
• Any wired mouse or trackball
without internal USB hub or
composite device functions;
• USB hub and composite devices
are allowed as TOE can filter USB
endpoints (if at least one endpoint
is a keyboard or mouse HID class).
In such case TOE will disable all
other endpoints;
• Touch-screen;
• Multi-touch or digitizer;
• USB
User
authentication
device
• Smartcard, CAC reader;
• Token;
• Biometric reader;
• Any other qualified device if PSS
supports configurable user
authentication device filtering
• USB
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and that specific USB device is
both whitelisted and not
blacklisted.
Note that user authentication device
must be powered by the TOE. External
power source is prohibited.
Audio out • Analog amplified speakers;
• Analog headphones;
• Digital audio appliance.
Note that the use of analog
microphone or line-in audio devices
is strictly prohibited.
• Analog audio output;
• Digital audio (for example SPDIF);
• Digital audio embedded inside the
video.
Display • Display;
• Projector;
• Video or KVM extender.
Note that the use of wireless video
transmitters with the TOE is not
allowed.
• DVI;
• HDMI;
• DisplayPort;
• USB Type-C.
Table 23 - Authorized peripheral devices (derived from referenced PP table 12)
The above features assure that the TOE satisfies the following PP objectives and security functional
requirements:
i. [O.NO_DOCKING_PROTOCOLS]  FDP_IFC.1(1) and FDP_IFF.1(1)
ii. [O.NO_OTHER_EXTERNAL_INTERFACES]  FDP_IFC.1(2) and FDP_IFF.1. (2)
iii. [O.NO_ANALOG_AUDIO_INPUT]  FDP_IFC.1(1) and FDP_IFF.1(1)
7.3 TOE Audio Subsystem security functions
The TOE audio data flow path is electrically isolated from all other functions and interfaces to prevent
signaling data leakages to and from the audio paths.
Audio paths include:
a. The audio switching is controlled by the TOE system controller function through dedicated
unidirectional command lines. Audio signals cannot be digitized or otherwise sampled by any
TOE circuitry.
b. TOE is having separate interface per computer. Each interface is electrically isolated from other
interfaces or other TOE circuitry;
c. TOE audio Switching multiplexer uses a combination of mechanical relays and solid state
multiplexer to assure high off isolation;
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d. Audio unidirectional flow data diodes (two) to prevent audio data flow from audio device to
selected computer; and
e. Separate channel selection control by the user with optional freeze function. When the TOE is
unpowered, an audio isolation relay is open up to isolate the audio inputs (computer interfaces)
from all other circuitry and interfaces. TOE self-test failure or anti-tampering activation will de-
energize the same audio isolation relay to isolate the audio inputs. TOE audio subsystem does
not store, convert or delay any audio data flows. There is no risk of audio overflow while
switching between channels.
f. The use of analog microphone or line-in audio devices is strictly prohibited per user guidance. All
TOE that support analog audio out switching will reject a microphone through the following two
methods:
a. Analog audio data diode that forces data to flow only from computer to connected
audio peripheral device; and
b. Microphone DC bias barrier that blocks electrets microphone DC bias if deliberately or
inadvertently the TOE is being connected to connected computer microphone input
jack.
The above features assure that the TOE satisfies the following PP objectives and security functional
requirements:
i. [O.NO_ANALOG_AUDIO_INPUT]  FDP_IFC.1(1) and FDP_IFF.1(1).
ii. [O.UNIDIRECTIONAL_AUDIO_OUT]  FDP_IFC.1(1) and FDP_IFF.1(1).
iii. [O.COMPUTER_TO_AUDIO_ISOLATION]  FDP_IFC.1(1) and FDP_IFF.1(1).
iv. [O.PERIPHERAL_PORTS_ISOLATION]  FDP_IFC.1(1) and FDP_IFF.1(1) (limited to audio data
flows).
v. [O.ANTI_TAMPERING_PERMANENTLY_DISABLE_TOE]  FPT_PHP.3 and FPT_FLS.1 (limited to
audio data flows).
vi. [O.SELF_TEST]  FPT_TST.1 (limited to audio data flows).
vii. [O.SELF_TEST_FAIL_TOE_DISABLE] FPT_TST.1 and FPT_FLS.1 (limited to audio data flows).
viii. [O.NO_USER_DATA_RETENTION]  FDP_RIP.1 (limited to audio user data).
7.4 TOE video subsystem security functions
The TOE video data flow path is made of a unidirectional video and EDID paths.
To further illustrate the KVM TOE video subsystem security functions, the following figure show a
simplified block-diagram of the TOE in various operating mode.
In figure 8 below, the TOE video controller function reads the connected display EDID EEPROM content
through the closed isolation switch. No video is shown on display as the main video mux is switch to the
fifth (isolated) state.
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Figure 8 – Block diagram of KVM TOE video sub-system during display EDID read
This operating mode only occurs as the TOE is being powered up. The display EDID is not read at any
other time while the TOE is operating. The video controller function is checking the EDID content to
verify that it is valid and usable. If data is not valid – it will stop the programming sequence and wait for
display change (next Hot Plug event).
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Figure 9 – Block diagram of KVM TOE video sub-system during display EDID write
Figure 9 illustrate the same TOE sub-system while the video controller function (blue) is writing the EDID
content into the first channel emulated EDID EEPROM chip (gray). All thick lines in this figure are native
video lines. All thin lines are I2C lines. The EDID mux (light blue) is coupling the I2C lines to the first EDID
mode switch (orange). The first EDID mode switch is switching the video controller I2C lines to the first
emulated EDID EEPROM chip (gray). The chip write protect switch (green) is opened to enable writing.
Video controller uses the I2C lines to write the first emulated EDID EEPROM chip. Once writing
operation completed and verified, the video controller function will switch the EDID mux to the next
channel and the operation will repeat until all chips are programmed. Only when this write operation
was successfully completed, the video controller will switch to normal operating mode as can be seen in
figure 16 below.
In this mode the 4 Emulated EDID EEPROM chips are switched to their respective computers to enable
read. The 4 write protect switches (green) are switched back to protected mode to prevent any attempt
to write the EEPROM or transmit MCCS commands.
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In this mode each computer interface is completely independent. The power to each emulated EDID
EEPROM is received from its respective computer through the video cable. The main video mux is then
switched to the user selected computer to enable proper video display of that computer.
Figure 10 – Block diagram of KVM TOE video sub-system during normal mode
As shown in figure 10 above, during TOE normal operation, any attempt of one or more connected
computer to attack, program, and signal or otherwise affect the EDID channel will be blocked by this
architecture. Each computer effect will be contained in its own emulated EDID EEPROM.
The following features implemented in the TOE video subsystem (depending on the TOE model and
video protocols supported):
a. Video input interfaces are isolated from one another. Isolation is achieved through the use of
different power and ground planes, different electronic components and different emulated
EDID chips per channel.
b. EDID function is emulated by independent emulation EEPROM chip for each computer channels.
These chips are loaded with content read from the connected display once the TOE is powering
up. All changes in display after that are ignored.
c. TOE will reject display devices having non-valid EDID content. Proper user indications provided
by the TOE rear panel display status LED.
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d. TOE supports Display Port 1.1, 1.2 and 1.3. TOE video function filters the AUX channel by
converting it to I2C EDID only. DisplayPort video is converted into HDMI video stream and I2C
EDID lines that being connected to the same emulated EDID EEPROM functions as shown in
figures 8 – 10 above). All AUX channel threats are mitigated through the conversion from
DisplayPort to HDMI protocols. All types of traffic not authorized by the referenced PP including
USB, Ethernet, MCCS and EDID write are blocked by this TOE function as the emulated EEPROM
would only support valid EDID read requests from connected computers. Note that HEAC and
CEC functions are not connected in these TOEs and therefore not supported.
e. TOE video subsystem blocks MCCS write transactions through the emulated EDID EEPROMs.
Emulated EEPROMs only supports EDID read transactions. As shown in figure 10 – emulated
EDID EEPROMs cannot be written by their respective computers. The write protect switch will
prevent such operation.
f. When TOE is unpowered or after TOE anti-tampering was triggered or after TOE self-testing has
failed – all video signals are isolated (inputs from inputs and from outputs) by the active video
re-drivers. Emulated EDID EEPROMs may still operate as it is powered by its respective
computer, but isolation will remain the same as can be seen in figure 10 above.
The above features assure that the TOE satisfies the following PP objectives and security functional
requirements:
i. [O.COMPUTER_INTERFACE_ISOLATION]  FDP_IFC.1(1) and FDP_IFF.1(1) (limited to video data
flows).
ii. [O.COMPUTER_INTERFACE_ISOLATION_TOE_UNPOWERED]  FDP_IFC.1(1) and FDP_IFF.1(1)
(limited to video data flows).
iii. [O.USER_DATA_ISOLATION]  FDP_IFC.1(1) and FDP_IFF.1(1) (limited to video data flows).
iv. [O.PERIPHERAL_PORTS_ISOLATION]  FDP_IFC.1(1) and FDP_IFF.1(1) (limited to video data
flows).
v. [O.UNIDIRECTIONAL_VIDEO]  FDP_IFC.1(1) and FDP_IFF.1(1).
vi. [O.UNIDIRERCTIONAL_EDID]  FDP_IFC.1(1) and FDP_IFF.1(1).
vii. [O.SELF_TEST]  FPT_TST.1 (limited to video data flows).
viii. [O.SELF_TEST_FAIL_TOE_DISABLE]  FPT_TST.1 and FPT_FLS.1 (limited to video data flows).
ix. [O.NO_USER_DATA_RETENTION]  FDP_RIP.1 (limited to video user data).
7.5 TOE User authentication device subsystem security functions
TOE supports User Authentication Device function (called DPP or fUSB). These products are configured
by default as FDF (Fixed Device Filtration) with filter set to qualify only the following devices:
• Standard smart-card reader USB token or biometric authentication device having USB smart-
card class interface complying with USB Organization standard CCID Revision 1.1 or ICCID
Revision 1.0.
Note that device must be bus powered;
At any time after production, qualified administrator after successfully logging-in to the TOE
administrative function may switch the TOE to CDF (Configurable Device Filtration) mode through
loading any white-list/black-list or traffic rules. Traffic rules are only related to preventing DPP from
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being switched to the currently selected computer. While in this mode, the TOE may qualify any USB
1.1, 2.0 or 3.0 based on the following one or more criterions:
1. USB Class;
2. USB Sub-class;
3. USB Protocol;
4. USB device ID;
5. USB Vendor ID;
6. USB Serial number;
The DPP function features (refer to figure 6 above area H):
a. Isolated computer interfaces 60x per connected computers 6x respectively. Each DPP computer
interface 60x is using independent circuitry and power planes. There is no shared circuitry or
logical functions with other ports or other TOE functions.
b. Qualification microcontroller 52 drives the mode select switch 54 that initially routes the device
USB to the microcontroller.
c. The qualification microcontroller uses the predefined USB qualification parameters and
compares them with the discovered USB device 40 parameters. In case that the parameters are
matching – device is qualified.
d. If device 40 is qualified, the qualification microcontroller 52 switches the mode switch 54 to the
USB multiplexer 56. The USB multiplexer 56 receives channel selected commands 23 from the
system controller function 20 to allow proper selection of connected computer selected by the
user.
e. The user authentication device data paths in the TOE are fully isolated from all other user data
paths and functions.
f. TOE will only enumerate and enable peripheral devices that are predefined by authenticated
administrator. Before and during USB session, the device enumeration set of details is being
compared with pre-stored values to determine if the device can be qualified or should be
rejected. The CDF definitions may define one or more device characteristics such as: USB device
class, protocol, sub-protocol, VID, PID, serial number etc.
g. Once the user switches the connected computer, the TOE resets the user authentication device
through power supply switching (temporary power dip as defined by the referenced PP). This is
done through High-side Power switches on the System Controller board that switches 5V power
to the DPP device jack. Load FET transistor is shorting the supply voltage to the ground to assure
that all capacitance in the TOE or in the connected device would be quickly discharged and go
below 2V as required by the PP.
h. The TOE does not emulate or process user authentication device data. No data retention is
possible.
i. When TOE is unpowered or after TOE anti-tampering was triggered or after TOE self-testing has
failed – all user authentication device data paths are isolated (switched off) through peripheral
mux. Such disconnection will disconnect open authentication sessions per USB CCID standard.
j. The only traffic rules that can be set by the administrator are related to preventing user
authentication device (DPP or CAC) from accessing a specific selected computer. It is only
negative rules for the DPP/CAC. This means that the TOE blocks all USB devices other than user
authentication by default. This is done to provide the most secure setting by default. Any white
listing is reducing initial negative parameters. Any black listing is adding more parameters to the
list I the TOE.
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k. TOE User authentication port implementation is operating by default as Fixed device filtering –
TOE will allow only user authentication devices.
l. TOE having fUSB function enable administrator configuration that switch the TOE to
Configurable device filtering mode – TOE will allow any USB device based on configurable rules
(for example whitelist and blacklist). Refer to the PP FDP_IFF.1.5(2) rules 5 and 6 and Annex C
table 12 comment 6.
m. User authentication device must be powered by the TOE. External power source is prohibited
per applicable user guidance.
n. All TOE has Restore to Factory Default option available via Administrator mode. Once an
administrator performs restore to factory defaults, the following events will happen:
1. All peripheral devices will be disconnected from selected computers;
2. Front panel indications will blink all together;
3. The TOE will reset and perform normal power up and self-test sequence (no user
indications while powering up and self-testing);
4. Then the TOE will resume normal operation while all settings and internal cache except
for log are reset to the factory defaults. User indications will resume normal behavior at
this stage unless TOE failed the self-test.
5. Note that administrator credentials and log data are not erased by this function.
The above features assure that the TOE satisfies the following PP objectives and security functional
requirements:
a. [O.COMPUTER_INTERFACE_ISOLATION]  FDP_IFC.1(1) and FDP_IFF.1(1) (limited to user
authentication device data flows).
b. [O.COMPUTER_INTERFACE_ISOLATION_TOE_UNPOWERED]  FDP_IFC.1(1) and FDP_IFF.1(1)
(limited to user authentication device data flows).
c. [O.USER_DATA_ISOLATION]  FDP_IFC.1(1) and FDP_IFF.1(1) (limited to user authentication
device data flows).
d. [O.PERIPHERAL_PORTS_ISOLATION]  FDP_IFC.1(1) and FDP_IFF.1(1) (limited to user
authentication device data flows).
e. [O.USER_AUTHENTICATION_ISOLATION]  FDP_IFC.1(1) and FDP_IFF.1(1).
f. [O.USER_AUTHENTICATION_RESET]  FDP_IFF.1. (1) and FTA_ATH_EXT.1.
g. [O.USER_AUTHENTICATION_ADMIN]  FMT_SMF.1 b, FMT_MOF.1 and FMT_SMR.1.
7.6 TOE User control and monitoring security functions
TOE is controlled and monitored by the user through front panel illuminated push-buttons and switches.
These controls and indications are coupled to the TOE system controller function. This function features:
a. Internally illuminated push-buttons for computer channel selection. User may attach labels with
computer name near push-buttons.
b. Additional white LEDs per channel to indicate audio and user authentication device channel
selection.
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c. Freeze function push-button and LED to enable audio and user authentication device channel
freeze and to provide freeze status indication. This implementation allows user to split the TOE
control as defined in the referenced PP.
d. TOE does not support keyboard shortcuts for channel selection or automatic port scanning.
There are no firmware or hardware functions to support such unauthorized TOE control
features.
e. All TOE user control methods are authorized by the referenced PP.
f. TOE does not enable user channel selection control by connected computer. No interface
capable of this function provided by the TOE.
g. Channel selection indications provided by the TOE cannot be dimmed or disabled. Indications
are continuous and are visible to the user at any time using the TOE.
h. The communication, configuration and integrity of the TOE front panel are being tested during
power up self-testing. During power up until the TOE successfully passed the self-test, no
channel is selected and therefore no TOE state provided to the user.
i. After self-test passed at all times that the TOE is operative, front panel indications are provided
and cannot be turned off or dimmed by the user in any way.
The above features assure that the TOE satisfies the following PP objectives and security functional
requirements:
i. [O.AUTHORIZED_SWITCHING]  FDP_IFC.1(2) and FDP_IFF.1(2)
ii. [O.NO_AMBIGUOUS_CONTROL]  FDP_IFC.1(2) and FDP_IFF.1(2)
iii. [O.CONTINUOUS_INDICATION]  FTA_CIN_EXT.1
iv. [O.NO_CONNECTED_COMPUTER_CONTROL] FDP_IFC.1(1) and FDP_IFF.1(1)
7.7 TOE Tampering protection
a. All TOE microcontrollers are running from internal protected flash memory. Firmware cannot be
updated by the user through external tools.
b. Firmware cannot be read or rewrite through JTAG tools by internal interfaces. Firmware
execution performed on SRAM with proper protection from external access and tampering of
code or stacks.
c. The TOE enclosure was designed specifically to prevent physical tampering. It features stainless
steel welded chassis and panels that prevent external access through bending or brute force.
a. Always-on anti-tampering system mechanically coupled to the TOE enclosure to detect and
attempt to access the TOE internal circuitry.
b. Anti-tampering is powered by the TOE power supply and by a backup battery. If battery is
depleted or failing – the anti-tampering function will trigger and the TOE will become
permanently disabled.
c. The TOE anti-tampering function is irreversible. Once it is triggered – TOE will be permanently
disabled through melting of internal (on-die) micro-fuse.
d. All TOE interfaces and user functions are disabled and proper user indications are shown
through sequentially blinking front panel LEDs.
e. TOE is equipped with special holographic Tampering Evident Labels that located in critical
location on the TOE enclosure. Any attempt to access the TOE internal circuitry would cause
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permanent visible damage to one or more TEL. Each label is numbered with unique number that
recoded by the manufacturer during TOE production.
f. During production, each TOE receives a unique secret key (long unique number) that is securely
stored in crypto-memory chip. This secret key is required to enable normal TOE boot and power
up. If the secret key is missing or incorrect (cannot be authenticated by the TOE system
controller) then the TOE will enter isolated mode and TOE will provide tampering indications.
The anti-tampering sensors interrupting the power to the crypto memory and as a result delete
the secret key once sensors are momentarily interrupted. In addition, once the secret key
cannot be authenticated, the TOE System Controller function burns a microscopic fuse on its die
that causes irreversible change in the operating program.
g. All anti-tampering production and in-service events are recorded in TOE internal non-volatile
memory with time and date tags to enable traceable audit through one of the two supported
methods:
I. Using special USB cable supplied as an optional accessory by the vendors, PC may be
connected to the TOE. Using administrator user name and password, authorized
administrator may download the stored log files into text or Excel file; and
II. If TOE support keyboard then the keyboard device emulator may be used to type the log
data into text editor application such as Notepad running in a connected computer. This
function also requires administrator identification and authentication through proper
user name password entry through the connected keyboard.
The above features assure that the TOE satisfies the following PP objectives and security functional
requirements:
i. [O.NO_TOE_ACCESS]  FPT_PHP.3 and FPT_FLS.1
ii. [O.TAMPER_EVIDENT_LABEL]  FPT_PHP.1
iii. [O.ANTI_TAMPERING]  FPT_PHP.3
iv. [O.ANTI_TAMPERING_BACKUP_POWER]  FPT_PHP.3
v. [O.ANTI_TAMPERING_BACKUP_FAIL_TRIGGER]  FPT_PHP.3
vi. [O.ANTI_TAMPERING_INDICATION]  FPT_PHP.1
vii. [O.ANTI_TAMPERING_PERMANENTLY_DISABLE_TOE]  FPT_PHP.3 and FPT_FLS.1
7.8 TOE Self-testing and Log
TOE is equipped with self-testing function that operating while TOE is being powered up prior to normal
use. The self-test function is running independently at each one of the TOE microcontrollers following
power up.
a. If the self-testing function has failed, the TOE will provide proper user indications and will
disable normal operation while isolating all / or affected peripheral devices and connected
computers.
b. The self-testing function checks the integrity of the TOE microcontroller firmware, the anti-
tampering function, and the control functions.
c. The self-testing function further test computer ports isolation by running test packets at
different interfaces and attempting to detect traffic at all other interfaces.
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d. All failures detected by the self-testing are recorded in the TOE log file together with time tags.
Log content cannot be deleted by user or administrator.
The above features assure that the TOE satisfies the following PP objectives and security functional
requirements:
i. [O.SELF_TEST]  FPT_TST.1
ii. [O.SELF_TEST_FAIL_TOE_DISABLE]  FPT_TST.1 and FPT_FLS.1
iii. [O.SELF_TEST_FAIL_INDICATION]  FPT_TST.1
TOE is equipped with event log non-volatile memory that stores information about abnormal security
related events. There are two log storage spaces that differ in their operational logic:
1. Critical log area –This log area stores the following data in fixed structure:
a. The product registration information (once during production);
b. The anti-tampering arming event (once during production);
c. Tampering events detected (may be up to 6 possible event flags, each with data and
time);
d. The last admin log-on information (one event); and
e. The last self-test failure information (one event with error codes).
2. Non-critical log – This log area holds a maximum of 32 lines of data. Every new event will delete
the oldest line. This area holds the following data:
a. Administrator log in and changes made;
b. Changes in administrator user name or password;
c. Rejection of USB devices;
d. Self-test failures;
e. CDF (black-list / white-list) and traffic rules uploading; and
f. Power up and down cycles.
Log can be extracted by one of the 3 options (in the first two options log can only be read – it cannot be
written or delete):
i. Using special programming cable and software utility running on a connected PC. Administrator
log-in is needed.
ii. Using connected PC and Notepad. Log can be dumped to the notepad. Again, administrator log-
on is needed.
iii. If the device was tampered then no external communication is possible. In the factory, the
vendor may de-solder the part and extract the memory content using low-level tools.
The above features assure that the TOE satisfies the following PP objectives and security functional
requirements:
i. [O. ANTI_TAMPERING_INDICATION]  FAU_GEN.1.1 and FAU_GEN.1.2
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7.9 The TOE Administrator Access mechanism
Certain function on the TOE requires admin (management) log in. The administrator login steps are
described in the admin guide of the TOE and are not part of the regular user manual of the TOE. Regular
user use of the TOE does not require any special access or log in.
Admin access is done by authenticating using a user name and password. On first logon the
administrator’s password must be changed to password containing at least 8 characters, upper and
lower-case letters, numbers and special characters. It is impossible to reset the password of the
administrators without logging into the TOE.
Once logged in the administrator has access to certain tasks such as: Reset to factory defaults, configure
white and black list rules for authentication devices and view the TOE log.
White and black list configuration are an operation in which the administrator configures the TOE to
allow (white list) or to block (black list) certain USB devices from being connected to the TOE fUSB port.
The defined black list is always “stronger” than the white list meaning whenever there is a conflict
between the white and black lists the devices on the black list will be blocked even if it is on the white
list as well.
The TOE log will include all management events and it cannot be delated. Every event including login,
change of password. New user, change DPP approved list will be logged and can be checked.
Once the administrator wants to close the management session he needs to power cycle the TOE.
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Annex A – HSL Model Numbering
The following text explains the HSL model numbering of secure KVM, KM, Matrix, Filters, Isolators and
MDRs.
Figure 11 – HSL Secure products model numbering
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Annex B – Tests to Specific TOE models mapping
The following table provides mapping between the referenced PP tests and the specific TOE models to
be tested. The notes added below provides justification for each test that is not applicable for specific
TOE.
Test Setup / TOE Part
C
–
2P
KVM
D
–
4P
KVM
F
–
Mini-Matrix
KVM
I
–
8P
KVM
Test 4.1 – User Control - ● ● ● ●
Test 4.2 – Keyboard Switching, Data Isolation and Device Qualification
Rules
1 ● ● ● ●
2 ● ● ● ●
3 ● ● ● ●
4 ● ● ● ●
5 ● ● ● ●
Test 4.3 - Mouse Switching, Data Isolation and Device Qualification
Rules
1 ● ● ● ●
2 ● ● ● ●
3 ● ● ● ●
4 ● ● ● ●
5 ● ● ● ●
Test 4.4 - Display Switching, Data Isolation and Unidirectional Flow
Rules
1 ● ● ● ●
2 [1]
3 ● ● ● ●
Test 4.5 –User Authentication Device Switching and Isolation Rules
1 [2] ● ● ●
2 [3]
3 ● ● ●
4 ● ● ●
5 ● ● ●
Test 4.6 – Analog Audio Output Switching, Isolation and data-flow Rule
1 ● ● ● ●
2 ● ● ● ●
Test 4.7 – No Other External Interface - ● ● ● ●
Test 4.8 – No Flow between Computer Interfaces (USB-to-USB, Power- - ● ● ● ●
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to-USB)
Test 4.9 – No Flow between Computer Interfaces with TOE Powered Off
(USB-to-USB, Power-to-USB)
- ● ● ● ●
Test 4.10 – No Flow between Computer Interfaces (Power-/ USB-to-
Audio)
- ● ● ● ●
Test 4.11 – Peripheral to Peripheral Interface Rule - [2] ● ● ●
Test 4.12 – Residual Information Protection - ● ● ● ●
Test 4.13 - Tampered TOE is permanently disabled and properly isolated
1 ● ● ● ●
2 ● ● ● ●
3 ● ● ● ●
Test 4.14 - Self-Test Pass and Fail - ● ● ● ●
Test 4.15 – Power Up Defaults, Continuous Indications and Single
Control
- ● ● ● ●
Optional Test F.1.2 - Audit data generation - ● ● ● ●
Optional Test F.1.3 – Administrator authentication and functions access - ● ● ● ●
Table 24 - PP Tests to Test Setups
Notes / Justification:
[1] Test is not applicable per referenced PP as TOE does not support pass-through DisplayPort video.
[2] 2-Port KVM TOE models does not support user authentication device (DPP).
[3] Test not applicable per referenced PP as TOE does not support emulated user authentication
functions.
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Annex C – Letter of Volatility
The following pages capture the Letter of Volatility issued by High Sec Labs for the TOE.
The table below provides volatility information and memory types for the High Sec Labs DP-DP
Secure KVM and Matrix as part of the documentation required for compliance with NIAP
Peripheral Sharing Switch Protection Profile Rev 3.0. Please note that there are no remnants of
user data retained in the device when the power is turned off.
Product Model No. in
each
product
Function, MFR and
P/N
Storage
Type
Size Volatility Contains User Data
SK41PPU-3
DK42PHU-3
DK42PPU-3
SX42PU-3
1 or 2 System Controller, Host
emulators, DPP
Controller (optional);
ST Microelectronics
STM32F446ZCT
Embedded
SRAM1
128KB Volatile May contain user data
Embedded
Flash2
256KB Non-Volatile No user data
Embedded
EEPROM
4KB Non-Volatile No user data
OTP
Memory
512bytes Non-Volatile No user data
1 in SH
or 2 in
DH
models
Video Controller;
ST Microelectronics
STM32F070C6T6
Embedded
SRAM1
6KB Volatile No user data
Embedded
Flash2
32KB Non-Volatile No user data
Embedded
EEPROM
4KB Non-Volatile No user data
4 in SH
or 8 in
DH
models
Device emulators;
ST Microelectronics
STM32F070C6T6
Embedded
SRAM1
6KB Volatile May contain user data
Embedded
Flash2
32KB Non-Volatile No user data
Embedded
EEPROM
4KB Non-Volatile No user data
4 in SH
or 8 in
DH
models
EDID Emulator;
ST Microelectronics
M24C02-WMN6TP
EEPROM5
2KB Non-Volatile No user data
SK81PPU-3
DK82PPU-3
SX82PU-3
1 or 2 System Controller, Host
emulators, DPP
Controller (optional);
ST Microelectronics
STM32F446ZCT
Embedded
SRAM1
128KB Volatile May contain user data
Embedded
Flash2
256KB Non-Volatile No user data
Embedded
EEPROM
4KB Non-Volatile No user data
OTP
Memory
512bytes Non-Volatile No user data
1 in SH
or 2 in
DH
models
Video Controller;
ST Microelectronics
STM32F070C6T6
Embedded
SRAM1
16KB Volatile No user data
Embedded
Flash2
128KB Non-Volatile No user data
Embedded
EEPROM
4KB Non-Volatile No user data
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8 in SH
or 16 in
DH /16P
models
Device emulators;
ST Microelectronics
STM32F070C6T6
Embedded
SRAM1
16KB Volatile May contain user data
Embedded
Flash2
128KB Non-Volatile No user data
Embedded
EEPROM
4KB Non-Volatile No user data
8 in SH
or 16 in
DH /16P
models
EDID Emulator;
ST Microelectronics
M24C02-WMN6TP
EEPROM5
2KB Non-Volatile No user data
Notes:
1
SRAM stores USB Host stack parameters and up to 4 last key-codes. Data is erased when the KVM is
being powered off. It is also erased whenever the user switches channels. Device emulators are powered
by the individual connected computers and therefore devices are powered as long as the connected
computer is powered.
2
Flash is used to store firmware code and contains no user data. Flash is permanently locked by fuses
after initial programming to prevent rewriting (becoming ROM). It is an integral part of the ST
Microcontroller together with SRAM and EEPROM.
5
EEPROM is used to store operational parameters (display Plug & Play) and contains no user data.
These devices are powered by the individual computers connected to the TOE and therefore are powered
as long as powered computer is connected.
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Annex D – Letter of Declaration – Spectre / Meltdown Vulnerability
The following pages capture the Letter of Declaration issued by High Sec Labs as mitigation for Spectre
/ Meltdown vulnerabilities.
We are aware of the recent industry-wide announcement regarding vulnerabilities with certain
advanced microprocessors.
As an active member of the Cybersecurity vendor community we are currently analyzing the impact of
Spectre and Meltdown vulnerabilities on our current and past products.
We specifically addressed the vulnerabilities of Speculative Processors to Cache Timing Side-Channel
Mechanism.
So far we completed the analysis of all of our current and past secure KVM products. Based on this
analysis High Sec Labs acknowledge that:
1. None of our current and past secure KVM products is using Intel or AMD processors.
2. None of our current and past secure KVM products is using ARM Cortex-A8, Cortex-A9, and
Cortex-A15 architectures that are affected by the Spectre and Meltdown vulnerabilities.
3. None of our current and past secure KVM products is using other processor, DSP or ASIC that is
currently known to be affected by the Spectre and Meltdown vulnerabilities.
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Annex E – Tamper Evident Label
Below is the spec for HSL’s tamper evident label. The labels are placed on the TOE so it is impossible to
open the TOE mechanical cover without removing the labels. Physical tampering is indicated if the label
reveals a ‘VOID’ message or if the label is thorn. The label is not altered during normal use of the device.