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AUSCERT External Security Bulletin Redistribution
IRZ RUH2 3G Firmware Overwrite Vulnerability
18 May 2016
AusCERT Security Bulletin Summary
Product: IRZ RUH2 3G
Operating System: Network Appliance
Impact/Access: Reduced Security -- Remote with User Interaction
CVE Names: CVE-2016-2309
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IRZ RUH2 3G Firmware Overwrite Vulnerability
Original release date: May 17, 2016
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NCCIC/ICS-CERT has identified a firmware overwrite vulnerability in iRZ's
RUH2 device. iRZ has discontinued this product and no longer offers support.
This vulnerability could be exploited remotely. Exploits that target this
vulnerability are known to be publicly available.
The following iRZ product is affected:
An attacker could corrupt the firmware of the serial-to-Ethernet converters
employed for substation communications and network routers.
Impact to individual organizations depends on many factors that are unique
to each organization. ICS-CERT recommends that organizations evaluate
the impact of this vulnerability based on their operational environment,
architecture, and product implementation.
iRZ is a Russian-based company that maintains offices in several countries
around the world, including China, Iran, Ukraine, Kazakhstan, France,
Belgium, Switzerland, Italy, and Spain.
The affected product, RUH2, is a serial-to-network connector
system. According to iRZ, RUH2s are deployed across several sectors
including Commercial Facilities, Communications, Financial Services,
Healthcare and Public Health, and others. iRZ estimates that this product
is used primarily in Eastern Europe.
UNRESTRICTED UPLOAD OF FILE[a]
Authorized users can remotely update the firmware with an unvalidated patch.
CVE-2016-2309[b] has been assigned to this vulnerability. A CVSS
v3 base score of 6.1 has been assigned; the CVSS vector string is
This vulnerability could be exploited remotely.
EXISTENCE OF EXPLOIT
Exploits that target this vulnerability are publicly available.
An attacker with a low skill would be able to exploit this vulnerability.
iRZ recommends users replace the RUH2 with either the RUH2b or
RUH3. Additional information on this vulnerability is available at:
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 at:
recommended practices are available for reading and download, including
Improving Industrial Control Systems Cybersecurity with Defense-in-Depth
Additional mitigation guidance and recommended practices are
publicly available in the ICS-CERT 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.
CWE-434: Unrestricted Upload of File with Dangerous Type,
http://cwe.mitre.org/data/definitions/434.html, web site last accessed
May 17, 2016.
NIST uses this advisory to create the CVE web site report. This web
site will be active sometime after publication of this advisory.
web site last accessed May 17, 2016.
For any questions related to this report, please contact ICS-CERT at:
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
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