The DLL hijacking vulnerability in the Platform Common Services (PCS) Portal, if exploited, could allow malicious code execution within the context of the PCS Portal application.
The following versions of the AVEVA Software Platform Common Services (PCS) Portal are affected:
The following products ship a vulnerable version of the PCS Portal application and are affected:
The affected products are vulnerable to DLL hijacking through an uncontrolled search path element, which may allow an attacker control to one or more locations in the search path.
Noam Moshe of Claroty discovered and disclosed the vulnerability to the AVEVA Software Security Response Center.
AVEVA recommends organizations evaluate the impact of this vulnerability based on their operational environment, architecture, and product implementation. Users of affected versions of the products should apply the corresponding security update as soon as possible.
Security update PCS 4.5.3 is available for the following versions:
Security update PCS 4.4.7 is available for the following versions:
For more information on this issue, including security updates, please see Security Bulletin AVEVA-2021-008
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 recommends users take the following measures to protect themselves from social engineering attacks:
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. This vulnerability is not exploitable remotely.
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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