ATTENTION: Low skill level to exploit.
Equipment: 7KM PAC Switched Ethernet
Vulnerability: Resource Exhaustion
Siemens reports that the vulnerability affects the following 7KM PAC Switched Ethernet PROFINET expansion modules:
Successful exploitation of this vulnerability could cause a denial-of-service condition in the affected component that may require a manual restart of the main device to recover.
Siemens provides firmware Version V2.1.3 for 7KM PAC Switched Ethernet PROFINET expansion modules, which fixes the vulnerability, and recommends users to update to the new fixed version. The new firmware update can be found at the following location:
Siemens recommends users protect network access with appropriate mechanisms such as firewalls, segmentation, and VPNs. Siemens also advises that users configure the operational environment according to Siemens’ Operational Guidelines for Industrial Security:
For more information on this vulnerability and more detailed mitigation instructions, please see Siemens Security Advisory SSA-771218 at the following location:
NCCIC/ICS-CERT recommends that users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should:
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. 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 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.
No known public exploits specifically target this vulnerability. This vulnerability is not remotely exploitable.
A denial-of-service condition could be induced by a specially crafted PROFINET DCP packet sent as a local Ethernet (Layer 2) broadcast. The affected component requires a manual restart via the main device to recover.
Siemens reported this vulnerability and released an advisory with firmware update information.
Critical Infrastructure Sectors: Energy
Countries/Areas Deployed: Worldwide
Company Headquarters Location: Germany
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://us-cert.cisa.gov/ics
or incident reporting: https://us-cert.cisa.gov/report
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