Computer Associates AntiVirus CHM File Handling DoS Vulnerability
iDefense Security Advisory 07.24.07
Jul 24, 2007
eTrust is an antivirus application developed by Computer Associates.
More information can be found on the vendor's website at the following
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
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.
VI. VENDOR RESPONSE
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.
VII. CVE INFORMATION
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 (http://cve.mitre.org/), which standardizes names for
VIII. DISCLOSURE TIMELINE
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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X. LEGAL NOTICES
Copyright =A9 2007 iDefense, Inc.
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