As of January 10, 2023, CISA will no longer be updating ICS security advisories for Siemens product vulnerabilities beyond the initial advisory. For the most up-to-date information on vulnerabilities in this advisory, please see Siemensβ ProductCERT Security Advisories (CERT Services | Services | Siemens Global).
This updated advisory is a follow-up to the original advisory titled βICSA-22-104-13 Siemens SIMATIC S7-1500 CPU GNU/Linux subsystemβ published April 14, 2022, on the ICS webpage on cisa.gov/ICS.
Successful exploitation of these vulnerabilities could crash the device being accessed; a buffer overflow condition may allow remote code execution.
Siemens reports these vulnerabilities affect the GNU/Linux subsystem of the following products:
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GNU/Linux vulnerabilities have been identified. For a full list of the identified vulnerabilities, please see Siemens SSB-439005
Siemens reported these vulnerabilities to CISA.
Siemens is working on an update for the latest firmware version, and recommends the following mitigations:
For more information about these vulnerabilities and the associated mitigations, please see SSB-439005
CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should:
CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov. 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 on the ICS webpage on cisa.gov in the Technical Information Paper, ICS-TIP-12-146-01BβTargeted Cyber Intrusion Detection and Mitigation Strategies.
Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to CISA for tracking and correlation against other incidents.
CISA also recommends users take the following measures to protect themselves from social engineering attacks:
No known public exploits specifically target these vulnerabilities.
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