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AUSCERT External Security Bulletin Redistribution
Advisory (ICSA-17-283-02) JanTek JTC-200
11 October 2017
AusCERT Security Bulletin Summary
Product: JanTek JTC-200
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Cross-site Request Forgery -- Existing Account
Unauthorised Access -- Remote/Unauthenticated
CVE Names: CVE-2017-5791 CVE-2017-5789
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Original release date: October 10, 2017
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CVSS v3 9.8
ATTENTION: Remotely exploitable/low skill level to exploit. Public exploits
Vulnerabilities: Cross-site Request Forgery, Improper Authentication
The following versions of JTC-200, a TCP/IP converter, are affected:
JTC-200 all versions.
Successful exploitation of these vulnerabilities could allow for remote code
execution on the device with elevated privileges.
JanTek will not be developing mitigations for the vulnerabilities affecting
JTC-200. JanTek will be developing a JTC-300 model scheduled for release near
the end of 2017.
NCCIC/ICS-CERT recommends that users take defensive measures to minimize the
risk of exploitation of these vulnerabilities. Specifically, users should:
Minimize network exposure for all control system devices and/or systems, and
ensure that they are not accessible from the Internet.
Locate control system networks and remote devices behind firewalls, and
isolate them from the business network.
When remote access is required, use secure methods, such as Virtual Private
Networks (VPNs), recognizing that VPNs may have vulnerabilities and should be
updated to the most current version available. Also recognize that VPN is only
as secure as the connected devices.
ICS-CERT reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.
ICS-CERT also provides a section for control systems security recommended
practices on the ICS-CERT web page. Several recommended practices are
available for reading and download, including Improving Industrial Control
Systems Cybersecurity with Defense-in-Depth Strategies.
Additional mitigation guidance and recommended practices are publicly
available in the ICSCERT Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies, that is available for download from the ICS-CERT web site.
Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to ICS-CERT for
tracking and correlation against other incidents.
CROSS-SITE REQUEST FORGERY (CSRF) CWE-352
An attacker could perform actions with the same permissions as a victim user,
provided the victim has an active session and is induced to trigger the
CVE-2017-5789 has been assigned to this vulnerability. A CVSS v3 base score of
8.0 has been assigned; the CVSS vector string is
IMPROPER AUTHENTICATION CWE-287
The improper authentication could provide undocumented Busybox Linux shell
accessible over Telnet service without any authentication.
CVE-2017-5791 has been assigned to this vulnerability. A CVSS v3 base score of
9.8 has been assigned; the CVSS vector string is
Karn Ganeshan reported the vulnerabilities to ICS-CERT.
Critical Infrastructure Sectors: Critical Manufacturing
Countries/Areas Deployed: Europe and Asia
Company Headquarters Location: Taiwan
For any questions related to this report, please contact ICS-CERT at:
Email: firstname.lastname@example.org (link sends e-mail)
Toll Free: 1-877-776-7585
International Callers: (208) 526-0900
For industrial control systems security information and incident reporting:
ICS-CERT continuously strives to improve its products and services. You can
help by choosing one of the links below to provide feedback about this
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