CVSS v3 9.1
ATTENTION: Exploitable remotely/low skill level to exploit
Successful exploitation of this vulnerability could allow an unauthenticated remote user to escalate their privileges in the context of the program.
The following versions of SIMATIC WinCC OA, a client-server HMI, are affected:
Improper access control over Port 5678/TCP could allow an unauthenticated remote user to escalate privileges in the context of SIMATIC WinCC OA.
Siemens reported this vulnerability to NCCIC.
Siemens recommends updating to SIMATIC WinCC OA v3.14-P021, which is available at the link below:
Siemens also recommends the following manual mitigations to reduce risk:
<https://portal.etm.at/patchdownload.php?fp=version_3.14/win64vc12/ReadmeP021.txt> (Login Required)
For more information, see Siemens Security Advisory SSA-346256 at the following location:
NCCIC recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should:
NCCIC reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
NCCIC 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 on the ICS-CERT website 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 NCCIC for tracking and correlation against other incidents.
No known public exploits specifically target this vulnerability.