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 updated advisory titled ICSA-19-099-06 Siemens SIMATIC, SIMOCODE, SINAMICS, SITOP, and TIM (Update H) that was published June 9, 2020, on the ICS webpage on us-cert.gov.
Successful exploitation of this vulnerability could result in a denial-of-service condition leading to a restart of the webserver.
The following products and versions are affected:
All versions prior to v 15.1 Upd 4
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The webserver of the affected devices contains a vulnerability that may allow an attacker to cause a denial-of-service condition, which leads to a restart of the webserver.
CVE-2019-6568 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).
Siemens reported this vulnerability to CISA. Artem Zinenko of Kaspersky identified that SIPLUS is also affected.
Siemens recommends upgrading to the following firmware updates for the products below:
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For all other affected products, Siemens has identified the following specific workarounds and mitigations users can apply to reduce the risk:
As a general security measure, Siemens strongly recommends users protect network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends users configure the environment according to Siemensβ operational guidelines for Industrial Security, and follow the recommendations in the product manuals.
Additional information on industrial security by Siemens can be found at: <https://www.siemens.com/industrialsecurity>
For more information on the vulnerability and more detailed mitigation instructions, please see Siemens Security Advisory SSA-480230
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 us-cert.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.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.
No known public exploits specifically target this vulnerability.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-6568
www.siemens.com/cert/advisories
cert-portal.siemens.com/operational-guidelines-industrial-security.pdf
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