This updated advisory is a follow-up to the advisory update titled ICSA-19-344-04 Siemens SIMATIC Products (Update A) that was posted February 11, 2020, to the ICS webpage on the us-cert.gov website.
Successful exploitation of this vulnerability could allow an attacker already in a man-in-the-middle position to modify network traffic exchanged on Port 102/TCP.
The following Siemens products are affected:
An attacker in a man-in-the-middle position could modify network traffic exchanged on Port 102/TCP. Successful exploitation requires an attacker be able to perform a man-in-the-middle attack. Subsequent exploitation of this vulnerability could compromise communication integrity of the affected system.
Eli Biham, Sara Bitan, Aviad Carmel, and Alon Dankner from Faculty of Computer Science, Technion Haifa, reported this vulnerability to Siemens.
Uriel Malin and Avishai Wool from the School of Electrical Engineering, Tel-Aviv University, also reported this vulnerability to Siemens.
Siemens has released updates for the following affected products and recommends users update to the new version:
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Siemens is preparing further updates and recommends users apply the following specific countermeasures to reduce the risk until additional patches are available:
As a general security measure, Siemens strongly recommends protecting network access to devices with appropriate mechanisms. Siemens recommends users configure their environment according to the Siemens Operational Guidelines for Industrial Security and follow the recommendations in the product manuals to operate the devices in a protected environment.
Additional information on industrial security by Siemens can be found at: <https://www.siemens.com/industrialsecurity>
For further inquiries on security vulnerabilities in Siemens products, please contact the Siemens ProductCERT: <http://www.siemens.com/cert/advisories>
For more information on the vulnerability and more detailed mitigation instructions, please see Siemens Security Advisory SSA-273799 at the following location: <http://www.siemens.com/cert/advisories>
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-12-146-01B--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. High skill level is required to exploit this vulnerability.
For any questions related to this report, please contact the CISA at:
Toll Free: 1-888-282-0870
For industrial control systems cybersecurity information: https://www.us-cert.gov/ics
or incident reporting: https://www.us-cert.gov/report
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