This updated advisory is a follow-up to the advisory update titled ICSA-17-339-01 Siemens Industrial Products (Update R) published June 8, 2021, to the ICS webpage on us-cert.cisa.gov.
Successful exploitation of this vulnerability may allow a remote attacker to conduct a denial-of-service attack.
Siemens reports the vulnerability affects the following industrial products:
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Specially crafted packets sent to Port 161/UDP could cause a denial-of-service condition. The affected devices must be restarted manually.
CVE-2017-12741 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
George Lashenko of CyberX reported the vulnerability to Siemens.
Siemens has provided firmware updates for the following products to fix this vulnerability:
Siemens is preparing further updates and recommends the following mitigations until patches are available:
Siemens recommends users configure the operational environment according to the Siemens Operational Guidelines for Industrial Security.
For more information on the vulnerability and more detailed mitigation instructions, please see Siemens Security Advisory SSA-346262
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 us-cert.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 us-cert.cisa.gov in the Technical Information Paper, ICS-TIP-12-146-01B–Targeted 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.
No known public exploits specifically target this vulnerability.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-12741
www.siemens.com/cert/advisories
cert-portal.siemens.com/operational-guidelines-industrial-security.pdf
cwe.mitre.org/data/definitions/20.html
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