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Version
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Certification Report
Waterfall Unidirectional Security Gateway,
WF-500, Version 1
Sponsor and developer: Waterfall Security Solutions Ltd.
16 Hamelacha St., Afek Industrial Park
48091 Rosh Ha’ayin
Israel
Evaluation facility: Brightsight
Delftechpark 1
2628 XJ Delft
The Netherlands
Report number: NSCIB-CC-119023-CR
Report version: 1
Project number: NSCIB-CC-119023
Author(s): NLNCSA
Date: 10 April 2017
Number of pages: 12
Number of appendices: 0
Reproduction of this report is authorized provided the report is reproduced in its entirety.
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CONTENTS:
Foreword 4
Recognition of the certificate 5
International recognition 5
European recognition 5
1 Executive Summary 6
2 Certification Results 7
2.1 Identification of Target of Evaluation 7
2.2 Security Policy 7
2.3 Assumptions and Clarification of Scope 7
2.4 Architectural Information 8
2.5 Documentation 8
2.6 IT Product Testing 9
2.7 Re-used evaluation results 10
2.8 Evaluated Configuration 10
2.9 Results of the Evaluation 10
2.10 Comments/Recommendations 10
3 Security Target 11
4 Definitions 11
5 Bibliography 12
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Foreword
The Netherlands Scheme for Certification in the Area of IT Security (NSCIB) provides a third-party
evaluation and certification service for determining the trustworthiness of Information Technology (IT)
security products. Under this NSCIB, TÜV Rheinland Nederland B.V. has the task of issuing
certificates for IT security products, as well as for protection profiles and sites.
Part of the procedure is the technical examination (evaluation) of the product, protection profile or site
according to the Common Criteria assessment guidelines published by the NSCIB. Evaluations are
performed by an IT Security Evaluation Facility (ITSEF) under the oversight of the NSCIB Certification
Body, which is operated by TÜV Rheinland Nederland B.V. in cooperation with the Ministry of the
Interior and Kingdom Relations.
An ITSEF in the Netherlands is a commercial facility that has been licensed by TÜV Rheinland
Nederland B.V. to perform Common Criteria evaluations; a significant requirement for such a license is
accreditation to the requirements of ISO Standard 17025 “General requirements for the accreditation
of calibration and testing laboratories”.
By awarding a Common Criteria certificate, TÜV Rheinland Nederland B.V. asserts that the product or
site complies with the security requirements specified in the associated (site) security target, or that
the protection profile (PP) complies with the requirements for PP evaluation specified in the Common
Criteria for Information Security Evaluation. A (site) security target is a requirements specification
document that defines the scope of the evaluation activities.
The consumer should review the (site) security target or protection profile, in addition to this
certification report, in order to gain an understanding of any assumptions made during the evaluation,
the IT product's intended environment, its security requirements, and the level of confidence (i.e., the
evaluation assurance level) that the product or site satisfies the security requirements stated in the
(site) security target.
Reproduction of this report is authorized provided the report is reproduced in its entirety.
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Recognition of the certificate
Presence of the Common Criteria Recognition Arrangement and SOG-IS logos on the certificate
indicates that this certificate is issued in accordance with the provisions of the CCRA and the SOG-IS
agreement and will be recognised by the participating nations.
International recognition
The CCRA has been signed by the Netherlands in May 2000 and provides mutual recognition of
certificates based on the CC. Starting September 2014 the CCRA has been updated to provide mutual
recognition of certificates based on cPPs (exact use) or STs with evaluation assurance components
up to and including EAL2+ALC_FLR. The current list of signatory nations and approved certification
schemes can be found on: http://www.commoncriteriaportal.org.
European recognition
The European SOGIS-Mutual Recognition Agreement (SOGIS-MRA) version 3 effective from April
2010 provides mutual recognition of Common Criteria and ITSEC certificates at a basic evaluation
level for all products. A higher recognition level for evaluation levels beyond EAL4 (resp. E3-basic) is
provided for products related to specific technical domains. This agreement was initially signed by
Finland, France, Germany, The Netherlands, Norway, Spain, Sweden and the United Kingdom. Italy
joined the SOGIS-MRA in December 2010. The current list of signatory nations, approved certification
schemes and the list of technical domains for which the higher recognition applies can be found on:
http://www.sogisportal.eu.
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1 Executive Summary
This Certification Report states the outcome of the Common Criteria security evaluation of the
Waterfall Unidirectional Security Gateway, WF-500, Version 1. The developer of the Waterfall
Unidirectional Security Gateway is Waterfall Security Solutions Ltd. located in Rosh Ha’ayin, Israel and
they also act as the sponsor of the evaluation and certification. A Certification Report is intended to
assist prospective consumers when judging the suitability of the IT security properties of the product
for their particular requirements.
The Target of Evaluation – TOE (i.e., the Waterfall Unidirectional Security Gateway, WF-500, Version
1) is a network gateway that enforces a unidirectional information flow policy on network traffic flowing
through the gateway. The TOE consists of two modules. The transceiver module (TX) reads network
frames from the sending network, and transmits them to the receiver module (RX) for writing to the
receiving network. The TOE hardware ensures that no information can flow from the receiving network
to the sending network. The two modules are connected via a single standard fiber-optic cable. This
cable is not part of the TOE.
The TOE has been evaluated by Brightsight B.V. located in Delft, The Netherlands. The evaluation
was completed on 10 April 2017 with the approval of the ETR. The certification procedure has been
conducted in accordance with the provisions of the Netherlands Scheme for Certification in the Area of
IT Security [NSCIB].
The scope of the evaluation is defined by the security target [ST], which identifies assumptions made
during the evaluation, the intended environment for the Waterfall Unidirectional Security Gateway, the
security requirements, and the level of confidence (evaluation assurance level) at which the product is
intended to satisfy the security requirements. Consumers of the Waterfall Unidirectional Security
Gateway are advised to verify that their own environment is consistent with the security target, and to
give due consideration to the comments, observations and recommendations in this certification
report.
The results documented in the evaluation technical report [ETR]
1
for this product provide sufficient
evidence that it meets the EAL4 augmented (EAL4+) assurance requirements for the evaluated
security functionality. This assurance level is augmented with ALC_DVS.2 (Sufficiency of security
measures), ALC_FLR.2 (Flaw reporting procedures) and AVA_VAN.5 (Advanced methodical
vulnerability analysis).
The evaluation was conducted using the Common Methodology for Information Technology Security
Evaluation, Version 3.1 Revision 4 [CEM], for conformance to the Common Criteria for Information
Technology Security Evaluation, version 3.1 Revision 4 [CC].
TÜV Rheinland Nederland B.V., as the NSCIB Certification Body, declares that the Waterfall
Unidirectional Security Gateway, WF-500, Version 1 evaluation meets all the conditions for
international recognition of Common Criteria Certificates and that the product will be listed on the
NSCIB Certified Products list. It should be noted that the certification results only apply to the specific
version of the product as evaluated.
1
The Evaluation Technical Report contains information proprietary to the developer and/or the
evaluator, and is not releasable for public review.
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2 Certification Results
2.1 Identification of Target of Evaluation
The Target of Evaluation (TOE) for this evaluation is the Waterfall Unidirectional Security Gateway,
WF-500, Version 1 from Waterfall Security Solutions Ltd. located in Rosh Ha’ayin, Israel.
The TOE is comprised of TX Modules (WF-500TX) and RX Modules (WF-500RX) organised in the
following product configurations:
Delivery
item type
Identifier Version Medium
Hardware WF-500 (includes a number of pre-configured
arrangements)
¡ WF-500 Compact
¡ WF-500 Standard
¡ WF-500 Standard split
¡ WF-500 Standard Host TX or Standard Host RX
1 19” rack cabinet
Firmware Internal, part of WF-500 V60.3 Preloaded on an
appliance during
manufacturing
To ensure secure usage a set of guidance documents is provided together with the Waterfall
Unidirectional Security Gateway. Details can be found in section 0 of this report.
2.2 Security Policy
The Target of Evaluation – TOE (i.e., the Waterfall Unidirectional Security Gateway, WF-500, Version
1) is a network gateway that enforces a unidirectional information flow policy on network traffic flowing
through the gateway. The TOE consists of two modules. The transceiver module (TX) reads network
frames from the sending network, and transmits them to the receiver module (RX) for writing to the
receiving network. The TOE hardware ensures that no information can flow from the receiving network
to the sending network. The two modules are connected via a single standard fiber-optic cable.
Assumptions and Clarification of Scope
2.3 Assumptions and Clarification of Scope
2.3.1 Assumptions
The assumptions defined in the Security Target are not covered by the TOE itself. These aspects lead
to specific Security Objectives to be fulfilled by the TOE-Environment. Detailed information on these
security objectives that must be fulfilled by the TOE environment can be found in section 4.2 of the
[ST].
Ø The intended operation environment shall prevent unauthorized physical access to the TOE
and to the fiber-optic cable connecting its separate parts.
Ø Physical access to the TOE shall be authorized only to personnel that will not attempt to
circumvent the TOE's security functionality.
Ø The TOE is the only interconnection between the sending and receiving networks.
2.3.2 Clarification of scope
The Security Target [ST] assumes an operational environment such that threats could come only from
the attached networks. From these threats T.HACK_LOW as defined in the Security Target [ST]
requires the IT environment to filter or transform the information transmitted through the TOE to the
receiving network such that it cannot result in compromise of the integrity of hosts or processes on the
receiving network.
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The evaluation did not reveal any other threats to the TOE that are not countered by the evaluated
security functions of the product.
2.4 Architectural Information
There are four different hardware configurations for the Waterfall Unidirectional Security Gateway,
WF-500, Version 1. The general architecture consists of two subsystems:
Ø the transceiver (TX) subsystem providing
o Read information from the sending network A
o Transmit information to the RX (via fiber-optic cable)
Ø the receiver (RX) subsystem providing
o Receive information from the TX subsystem
o Write information to the receiving network B
The TX subsystem contains a laser LED that converts electronic signals to light. The RX subsystem
contains a photoelectric cell that can sense light and convert it to electronic signals. The TX
subsystem and RX subsystem are connected via a single standard fiber-optic cable, allowing light to
move from the TX LED to the RX photoelectric cell. The cable is not included in the TOE.
The TOE Security Functionality is implemented entirely in hardware. The TOE also contains firmware
that implements functionality such as control of the front-panel display LEDs.
In Figure 1 the TOE is depicted in its operational environment. The TOE will be located within a
controlled access facility. The information flows through the primary RJ45 port (PRIM). The secondary
RJ45 port (SEC) is disabled. The TOE contains LEDs on the front panel to indicate the status of the
TOE.
Figure 1: The TOE in its environment
2.5 Documentation
The following documentation is provided with the product by the developer to the customer:
Identifier Version Medium
Waterfall Unidirectional Security Gateway WF-500
Common Criteria Evaluated Configuration Guide, version
1.0.9
November
2016
Paper / pdf
Network
A
Network
B
Status
LEDs
Status
LEDs
TOE boundary
RJ45
RJ45
RJ45
RJ45
TX RX
Fiber
OUT IN
PRIM PRIM
SEC SEC
Mains A Mains B
Mains B
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2.6 IT Product Testing
Testing (depth, coverage, functional tests, independent testing): The evaluators examined the
developer’s testing activities documentation and verified that the developer has met their testing
responsibilities.
2.6.1 Testing approach and depth
The developer has performed testing on FSP and subsystem level including all TSFI with four defined
tests.
The independent testing performed by the evaluator comprised of:
Ø Sample testing (4:ATE_IND.2-4) to validate the developer testing by repeating all four
developer tests, as the number is small.
Ø Independent testing (4:ATE_IND.2-6) was performed based on 6 new tests defined by the
evaluator for the validation of the correct information flow.
Before these tests were conducted it was verified that the TOE was suitable for testing and has a
unique reference number as identified in the ST introduction.
2.6.2 Independent Penetration Testing
The evaluator independent penetration tests were conducted according to the following testing
approach:
Ø The evaluators assessed all possible vulnerabilities found during evaluation of the classes.
This resulted in a shortlist with a number of possible vulnerabilities to be tested;
Ø The evaluators used CEM Annex B.2 as an additional source for possible vulnerabilities and
penetration tests;
Ø These were presented, under NSP#6, to the certifier.
The combination of all these sources led to 6 separate penetration tests that cover the following:
Ø Possible side channels that allow bystanders to eavesdrop information passing through the
TOE;
Ø Trying to cause a TOE failure such that the TOE comes in a state that it passes information
through from the receiving network to the sending network.
2.6.3 Test Configuration
The tests are performed on configuration WF-500 Compact. The following figure indicates the
components used in the tests.
Figure 2: TOE test set-up
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The penetration test set-up also included an oscilloscope to measure internal signals and an EMA coil
to measure EMA signals.
2.6.4 Testing Results
The testing activities, including configurations, procedures, test cases, expected results and observed
results are summarised in the [ETR], with references to the documents containing the full details.
The developer’s tests and the independent functional tests produced the expected results, giving
assurance that the TOE behaves as specified in its [ST] and functional specification.
No exploitable vulnerabilities were found with the independent penetration tests.
2.7 Re-used evaluation results
In this security evaluation direct re-use has been made of previous evaluation results on the previous
product certified on 12-07-2012 under NSCIB-CC-11-34146. Verification of the similarity of the newer
hardware platforms with the older hardware platforms has been performed using the developers
Impact Analysis Report (IAR). The original evaluator evidence has been updated to address all
changes and full independent and penetration testing has been repeated on the newer hardware
platforms.
There has also been extensive re-use of the ALC aspects for the sites involved in the development
and production of the TOE. No sites have been visited as part of this evaluation.
2.8 Evaluated Configuration
The TOE is defined uniquely by its name and version number Waterfall Unidirectional Security
Gateway, WF-500, Version 1 and can be identified by its identification at the backside of the
appliances.
2.9 Results of the Evaluation
The evaluation lab documented their evaluation results in the [ETR]
2
which references a ASE
Intermediate Report and other evaluator documents. The verdict of each claimed assurance
requirement is “Pass”.
Based on the above evaluation results the evaluation lab concluded the Waterfall Unidirectional
Security Gateway, WF-500, Version 1, to be CC Part 2 conformant, CC Part 3 conformant, and to
meet the requirements of EAL 4 augmented with ALC_DVS.2, ALC_FLR.2 and AVA_VAN.5. This
implies that the product satisfies the security requirements specified in Security Target [ST]. The
Security Target does not claim conformance to any Protection Profile.
2.10 Comments/Recommendations
The customer should be aware that:
Ø The TOE and the fiber optic link should be located within a controlled access facility that
prevents any possible physical access by unauthorized personnel. Authorized personnel must
not attempt to circumvent security functionality or tamper with the modules, or rewire network
connections to bypass the TOE;
Ø Use separate power and network infrastructure for the sending and receiving networks,
connected to the TX and RX, respectively.
Ø Ensure that, besides through the TOE, there are no information paths between the sending
and the receiving networks that might bypass the gateway, allowing information to flow in the
other direction. In particular, it is recommended to use physically separate network
infrastructures for the separate networks. Relying on virtual separation mechanisms (e.g.
VLANs on a shared switch) is not considered to be best practice.
2
The Evaluation Technical Report contains information proprietary to the developer and/or the
evaluator, and is not releasable for public review.
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3 Security Target
The Waterfall Unidirectional Security Gateway WF-500 Security Target, version 1.2, December 01,
2016 [ST] is included here by reference.
4 Definitions
This list of Acronyms and the glossary of terms contains elements that are not already defined by the
CC or CEM:
EMA Electromagnetic Analysis
IT Information Technology
ITSEF IT Security Evaluation Facility
LED Light Emitting Diode
NSCIB Netherlands scheme for certification in the area of IT security
NSP NSCIB Scheme Procedure
PP Protection Profile
TOE Target of Evaluation
VLAN Virtual LAN
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5 Bibliography
This section lists all referenced documentation used as source material in the compilation of this
report:
[CC] Common Criteria for Information Technology Security Evaluation, Parts I, II and III,
Version 3.1 Revision 4, September 2012.
[CEM] Common Methodology for Information Technology Security Evaluation, Version 3.1
Revision 4, September 2012.
[ETR] Evaluation Technical Report Waterfall Unidirectional Security Gateway WF-500
EAL4+, 16-RPT-574, v2.0, 4 April 2017.
[NSCIB] Netherlands Scheme for Certification in the Area of IT Security, Version 2.2,
August 10
th
, 2015.
[ST] Waterfall Unidirectional Security Gateway WF-500 Security Target, version 1.2,
December 01, 2016.
(This is the end of this report).