TrustCB B.V.
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TrustCB B.V. is a registered company at the
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under number 858360275.
Version
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Certification Report
WF-600 Waterfall-Security Unidirectional Security Gateway,
revision F
Sponsor and developer: Waterfall Security Solutions Ltd.
14 Hamelacha St.
Afek Industrial Park
Rosh Ha’ayin, 4809133
Israel
Evaluation facility: SGS Brightsight B.V.
Brassersplein 2
2612 CT Delft
The Netherlands
Report number: NSCIB-CC-2400089-01-CR
Report version: 1.1
Project number: NSCIB-2400089-01
Author(s): Andy Brown
Date: 29 May 2025
Number of pages: 12
Number of appendices: 0
Reproduction of this report is authorised only if the report is reproduced in its entirety.
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CONTENTS
Foreword 3
Recognition of the Certificate 4
International recognition 4
European recognition 4
1 Executive Summary 5
2 Certification Results 6
2.1 Identification of Target of Evaluation 6
2.2 Security Policy 6
2.3 Assumptions and Clarification of Scope 6
2.3.1 Assumptions 6
2.3.2 Clarification of scope 6
2.4 Architectural Information 6
2.5 Documentation 8
2.6 IT Product Testing 8
2.6.1 Testing approach and depth 8
2.6.2 Independent penetration testing 8
2.6.3 Test configuration 9
2.6.4 Test results 9
2.7 Reused Evaluation Results 9
2.8 Evaluated Configuration 9
2.9 Evaluation Results 9
2.10 Comments/Recommendations 9
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, TrustCB 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 TrustCB 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 TrustCB B.V. to
perform Common Criteria evaluations; a significant requirement for such a licence 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, TrustCB 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, 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 authorised only if the report is reproduced in its entirety.
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Recognition of the Certificate
Presence of the Common Criteria Recognition Arrangement (CCRA) and the SOG-IS logos on the
certificate indicates that this certificate is issued in accordance with the provisions of the CCRA and
the SOG-IS Mutual Recognition Agreement (SOG-IS MRA) and will be recognised by the participating
nations.
International recognition
The CCRA was signed by the Netherlands in May 2000 and provides mutual recognition of certificates
based on the Common Criteria (CC). Since 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.
For details of the current list of signatory nations and approved certification schemes, see
http://www.commoncriteriaportal.org.
European recognition
The SOG-IS MRA Version 3, effective since April 2010, provides mutual recognition in Europe of
Common Criteria and ITSEC certificates at a basic evaluation level for all products. A higher
recognition level for evaluation levels beyond EAL4 (respectively E3-basic) is provided for products
related to specific technical domains. This agreement was signed initially by Finland, France,
Germany, The Netherlands, Norway, Spain, Sweden and the United Kingdom. Italy joined the SOG-IS
MRA in December 2010.
For details of the current list of signatory nations, approved certification schemes and the list of
technical domains for which the higher recognition applies, see https://www.sogis.eu.
Page: 5/12 of report number: NSCIB-CC-2400089-01-CR, dated 29 May 2025
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1 Executive Summary
This Certification Report states the outcome of the Common Criteria security evaluation of the WF-600
Waterfall-Security Unidirectional Security Gateway, revision F. The developer of the WF-600 Waterfall-
Security Unidirectional Security Gateway, revision F 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 TOE is a network gateway that enforces a unidirectional information flow control policy on network
traffic flowing through the gateway. The TOE 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 model (TX) picks up network frames from a sending network (A), and
forwards them to the receiver model (RX) for transmission to a receiving network (B). The TOE
hardware ensures that no information can flow from the receiving network to the sending network. The
two models are connected via a single standard fibre-optic cable. This cable is not part of the TOE.
There are four different hardware configurations for WF-600 and the host agents exist in the same
cabinet. However, those agents are out of scope of the TOE as well.
The TOE has been evaluated by SGS Brightsight B.V. located in Delft, The Netherlands. The
evaluation was completed on 29 May 2025 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 WF-600 Waterfall-Security Unidirectional
Security Gateway, revision F, 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 WF-600 Waterfall-Security Unidirectional Security Gateway, revision F 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 the TOE meets the EAL4 augmented (EAL4+) assurance requirements for the evaluated
security functionality. This assurance level is augmented with AVA_VAN.5 (Advanced methodical
vulnerability analysis), ALC_DVS.2 (Sufficiency of security measures) and ALC_FLR.2 (Flaw reporting
procedures).
The evaluation was conducted using the Common Methodology for Information Technology Security
Evaluation, Version 3.1 Revision 5 [CEM] for conformance to the Common Criteria for Information
Technology Security Evaluation, Version 3.1 Revision 5 [CC] (Parts I, II and III).
TrustCB B.V., as the NSCIB Certification Body, declares that the 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. Note that the certification results apply only to the specific version of the
product as evaluated.
This document was re-issued on 29 May 2025 as version 1.1 to correct a typo in the evaluation facility
address in section 1.
1 The Evaluation Technical Report contains information proprietary to the developer and/or the
evaluator, and is not available for public review.
Page: 6/12 of report number: NSCIB-CC-2400089-01-CR, dated 29 May 2025
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2 Certification Results
2.1 Identification of Target of Evaluation
The Target of Evaluation (TOE) for this evaluation is the WF-600 Waterfall-Security Unidirectional
Security Gateway, revision F from Waterfall Security Solutions Ltd. located in Rosh Ha’ayin, Israel.
The TOE is comprised of the following main components:
Delivery
item type
Identifier Version
Hardware TX Traffic Controller, PN: WF-EBA000001 F
RX Traffic Controller, PN: WF-EBA000002 F
To ensure secure usage a set of guidance documents is provided, together with the WF-600 Waterfall-
Security Unidirectional Security Gateway, revision F. For details, see section 2.5 “Documentation” of
this report.
2.2 Security Policy
The TOE 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
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. For detailed information on the
security objectives that must be fulfilled by the TOE environment, see section 4.2 of the [ST].
2.3.2 Clarification of scope
The evaluation did not reveal any threats to the TOE that are not countered by the evaluated security
functions of the product.
Only the following cabinet configurations are part of the certification:
• WF-600-SYS-P
• WF-600-SYS-P-Split
• WF-600-SYS-L
• WF-600-SYS-L-Split
2.4 Architectural Information
The logical architecture, originating from the Security Target [ST] of the TOE can be depicted as
follows:
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The WF-600 Waterfall-Security TOE consists of the following components:
• TX Traffic Controller
• RX Traffic Controller
• TOE Guidance
Each of the Traffic Controllers performs a specific function:
• The Waterfall TX Traffic Controller receives information from a Host Agent software and
transmits information via a unidirectional fiber optic cable to the RX Traffic Controller.
• The Waterfall RX Traffic Controller receives information from the TX Traffic Controller via a
single unidirectional fibre optic cable and sends the information to an RX Host Agent.
The TOE has the following features:
• The TOE enables online transmission of information (e.g., information, alerts, files, video
streams, etc.) from a designated sending network to a designated receiving network in a
unidirectional mode only.
• No information can be transmitted in the reverse direction through the TOE.
• The TOE does not provide any management or auditing functionality.
• The TOE Security Functionality is implemented entirely in hardware.
The TX Traffic Controller uses an SFP that contains a laser diode that only transmits the light, that
converts electronic signals to light. The RX Traffic Controller contains a photoelectric cell that can
sense light and convert it to electronic signals. The TX and RX Traffic Controllers are connected via a
single standard unidirectional fibre-optic cable, allowing light to be transmitted from the TX laser diode
to the RX photoelectric cell.
The TOE also contains firmware that implements functionality such as control of the front-panel
display LEDs.
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2.5 Documentation
The following documentation is provided with the product by the developer to the customer:
Identifier Version
WF-600 Unidirectional Security Gateway Hardware V1.5 August 2024
Guide
V1.5
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 performed testing on functional specification and subsystem level, and included test
categories to:
• Demonstrate uni-directionality and direction of information flow
• Demonstrate that the SFPs of the TX and RX module enforce uni-directionality
• Test TX and RX Traffic controller Voltage
• Validate the software image installation restrictions
• Demonstrate uni-directionality and direction of information flow in a non-HA setup
o Test to validate the inability to send data in reverse direction with valid image
o Test to validate the inability to send data in reverse direction with invalid image
• Demonstrate uni-directionality and direction of information flow in a HA setup
o Test to validate the inability to send data in reverse direction with valid image
o Test to validate the inability to send data in reverse direction with invalid image
For the testing performed by the evaluators, the developer provided samples and a test environment.
The evaluators reproduced a selection of the developer tests.
The evaluator created and executed additional functional test cases test to further exercise the
behaviour of critical functionality.
2.6.2 Independent penetration testing
The evaluator conducted an advanced methodical vulnerability analysis based on publicly available
source of information and based on structured examination of the evidence while performing previous
evaluation activities (ASE, ADV, AGD, ATE):
• The first step of this type of vulnerability analysis is the identification of areas of concern (as
defined in [CEM] and the [CWE]). The areas of concern are identified by the evaluator using
the generic weaknesses enumeration database [CWE] version 3.1 as inspiration and the
[CEM, Appendix B].
• The evaluator then collected possible vulnerabilities from the design assessment by asking
security questions inspired by generic weaknesses separately for all security implementations
of the TOE, and collected possible vulnerabilities from applicable attack lists and public
vulnerability search.
• These security relevant questions were then translated into TOE-specific possible
vulnerabilities. From this analysis the evaluator determined whether a possible vulnerability
was removed or sufficiently mitigated by the TOE implementation/environment/functional
testing evidence. If yes, the possible vulnerability was considered as resolved, otherwise it
was labelled as a potential vulnerability. Potential vulnerabilities were then addressed in the
context of penetration tests and/or further code review.
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test effort expended by the evaluators was 2.5 weeks. During that test campaign, 30% of the total time
was spent on Perturbation attacks, 70% on side-channel testing.
2.6.3 Test configuration
The TOE was tested in the following configuration: WF-600-SYS-P. The evaluator provided a
justification for why the results were applicable for all TOE configurations.
2.6.4 Test 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.
The algorithmic security level of cryptographic functionality has not been rated in this certification
process, but the current consensus on the algorithmic security level in the open domain, i.e., from the
current best cryptanalytic attacks published, has been taken into account.
2.7 Reused Evaluation Results
There is no reuse of evaluation results in this certification.
2.8 Evaluated Configuration
The TOE is defined uniquely by its name and version number WF-600 Waterfall-Security
Unidirectional Security Gateway, revision F. Details of how to verify the TOE version are provided in
the Hardware Guide section 5.1
2.9 Evaluation Results
The evaluation lab documented their evaluation results in the [ETR], which references an 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 WF-600 Waterfall-Security
Unidirectional Security Gateway, revision F, to be CC Part 2 extended, CC Part 3 conformant and to
meet the requirements of EAL 4 augmented with AVA_VAN.5 (Advanced methodical vulnerability
analysis), ALC_DVS.2 (Sufficiency of security measures) and ALC_FLR.2 (Flaw reporting
procedures). This implies that the product satisfies the security requirements specified in Security
Target [ST].
2.10 Comments/Recommendations
The user guidance as outlined in section 2.5 “Documentation” contains necessary information about
the usage of the TOE. Certain aspects of the TOE’s security functionality, in particular the
countermeasures against attacks, depend on accurate conformance to the user guidance of both the
software and the hardware part of the TOE. There are no particular obligations or recommendations
for the user apart from following the user guidance. Please note that the documents contain relevant
details concerning the resistance against certain attacks.
In addition, all aspects of assumptions, threats and policies as outlined in the Security Target not
covered by the TOE itself must be fulfilled by the operational environment of the TOE.
The customer or user of the product shall consider the results of the certification within his system risk
management process. For the evolution of attack methods and techniques to be covered, the
customer should define the period of time until a re-assessment for the TOE is required and thus
requested from the sponsor of the certificate.
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The strength of the cryptographic algorithms and protocols was not rated in the course of this
evaluation. This specifically applies to the following proprietary or non-standard algorithms, protocols
and implementations: None (out of scope as there are no security claims.)
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3 Security Target
The WF-600 Waterfall-Security Unidirectional Security Gateway Security Target, v1.5, 25 September
2024 [ST] is included here by reference.
4 Definitions
This list of acronyms and definitions contains elements that are not already defined by the CC or CEM:
IT Information Technology
ITSEF IT Security Evaluation Facility
JIL Joint Interpretation Library
NSCIB Netherlands Scheme for Certification in the area of IT Security
PP Protection Profile
Rx Receive
TOE Target of Evaluation
Tx Transmit
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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 5, April 2017
[CEM] Common Methodology for Information Technology Security Evaluation,
Version 3.1 Revision 5, April 2017
[ETR] Evaluation Technical Report “Waterfall Unidirectional Security Gateway WF-
600” – EAL4+, 24-RPT-1178, Version 4.0, 28 May 2025
[NSCIB] Netherlands Scheme for Certification in the Area of IT Security, Version 2.6, 02
August 2022
[ST] WF-600 Waterfall-Security Unidirectional Security Gateway Security Target,
v1.5, 25 September 2024
(This is the end of this report.)