Public Vulnerability Reports

Computer Associates AntiVirus CHM File Handling DoS Vulnerability



eTrust is an antivirus application developed by Computer Associates. More information can be found on the vendor's website at the following URL.


Remote exploitation of a denial of Service (DoS) vulnerability in Computer Associates Inc.'s eTrust Antivirus products could allow attackers to create a DoS condition on the affected computer.

When eTrust Antivirus engine scans a malformed CHM file that has an invalid 'previous listing chunk number' field, the scanner will enter an infinite loop and be unable to process any other files.


This denial of service attack will prevent the scanner from scanning other files on disk while it is stuck on the exploit file. The hung process can be quit by the user and does not consume all system resources.


iDefense has confirmed this vulnerability in eTrust AntiVirus version r8. Previous versions of eTrust Antivirus are suspected vulnerable. Other Computer Associates products, as well as derived products, may also be vulnerable.


iDefense is not aware of any workarounds for this issue.


Computer Associates has addressed this vulnerability by releasing updates. These updates are available via the products' automatic update features. More information is available within Computer Associates advisory at the following URL.


The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2007-3875 to this issue. This is a candidate for inclusion in the CVE list (, which standardizes names for security problems.


01/16/2007 Initial vendor notification
01/17/2007 Initial vendor response
07/24/2007 Coordinated public disclosure


The discoverer of this vulnerability wishes to remain anonymous.

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Copyright © 2007 Verisign, Inc.

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