This updated advisory is a follow-up to the original advisory titled ICSA-20-203-01 Wibu-Systems CodeMeter that was published September 8, 2020, on the ICS webpage on us-cert.gov.
Successful exploitation of these vulnerabilities could allow an attacker to alter and forge a license file, cause a denial-of-service condition, potentially attain remote code execution, read heap data, and prevent normal operation of third-party software dependent on the CodeMeter.
The following versions of CodeMeter Runtime, a license manager, are affected:
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This license manager is used in products by many different vendors. As new instances are discovered/reported, they will be added to this list of affected products.
Multiple memory corruption vulnerabilities exist where the packet parser mechanism does not verify length fields. An attacker could send specially crafted packets to exploit these vulnerabilities.
Protocol encryption can be easily broken and the server accepts external connections, which may allow an attacker to remotely communicate with the CodeMeter API.
This vulnerability allows an attacker to use the internal WebSockets API via a specifically crafted Java Script payload, which may allow alteration or creation of license files when combined with CVE-2020-14515.
CodeMeter and the software using it may crash while processing a specifically crafted license file due to unverified length fields.
There is an issue in the license-file signature checking mechanism, which allows attackers to build arbitrary license files, including forging a valid license file as if it were a valid license file of an existing vendor. Only CmActLicense update files with CmActLicense Firm Code are affected.
An attacker could send a specially crafted packet that could have the server send back packets containing data from the heap.
Sharon Brizinov and Tal Keren of Claroty reported these vulnerabilities to CISA.
Wibu-Systems recommends the following:
For more information please see Wibu-Systems’ security advisories:
For more information on products dependent on the affected CodeMeter see the following vendor security advisories:
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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 provides a section for control systems security recommended practices on the ICS webpage on us-cert.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.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 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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