CVSS v3 7.0
This updated advisory is a follow-up to the original advisory titled ICSA-18-290-01 Omron CX-Supervisor that was published October 17, 2018, on the NCCIC/ICS-CERT website.
Successful exploitation of these vulnerabilities could allow an attacker to execute code under the context of the application, corrupt objects, and force the application to read a value outside of an array.
The following versions of CX-Supervisor are affected:
When processing project files and tampering with a specific byte, memory corruption may occur within a specific object.
When processing project files and tampering with the value of an offset, an attacker can force the application to read a value outside of an array.
4.2.3 USE AFTER FREE CWE-416
When processing project files the application fails to check if it is referencing freed memory, which may allow an attacker to execute code in under the context of the application.
A type confusion vulnerability exists when processing project files, which may allow an attacker to execute code in the context of the application.
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Mat Powell of Trend Micro’s Zero Day Initiative, Esteban Ruiz (mr_me) of Source Incite, Ariele Caltabiano (kimiya) of 9SG Security Team, and b0nd @garage4hackers working with Trend Micro’s Zero Day Initiative reported these vulnerabilities to NCCIC.
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Omron has released Version 3.4.2 of CX-Supervisor to address the reported vulnerabilities. Users can download the latest version of CX-Supervisor 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 these vulnerabilities. These vulnerabilities are not exploitable remotely. High skill level is needed to exploit.
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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