Successful exploitation of these vulnerabilities may allow an attacker to remotely execute arbitrary code.
The following version of Advantech WebAccess HMI Designer, a Human Machine Interface (HMI) Runtime Development Software, is affected:
Heap-based buffer overflow vulnerabilities caused by processing specially crafted .pm3 files may allow remote code execution.
Double free vulnerabilities caused by processing specially crafted .pm3 files may allow remote code execution.
Processing specially crafted .pm3 files may cause the system to write outside the intended buffer area and may allow remote code execution.
Steven Seeley of Source Incite working with Trend Micro’s Zero Day Initiative (ZDI) reported these vulnerabilities to NCCIC.
NCCIC is working with Advantech to provide mitigation steps to resolve the issues that have been reported in Advantech’s WebAccess HMI Designer.
NCCIC recommends that users take defensive measures to minimize the risk of exploitation of these vulnerabilities. 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 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 website.
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.
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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