Sophos Anti-Virus Petite File Denial of Service Vulnerability
iDefense Security Advisory 10.31.06 http://www.idefense.com/intelligence/vulnerabilities/ Oct 31, 2006
Sophos Anti-Virus is comprehensive scanning solution used to protect users from viruses, malicious code, ad-ware, trojans, and more. For more information see their website at http://sophos.com/
Remote exploitation of a denial of service vulnerability in version 5.1 of Sophos Anti-Virus could result in unusable system conditions.
The problem manifests itself when the scanning engine encounters an executable compressed with petite that contains a large number of sections.
Successful exploitation would result in the scanning engine attempting to allocate an extremely large amount of memory resulting in memory exhaustion on the system in question. The auto-scan features of Sophos Anti-Virus will attempt to scan files on access.
iDefense has confirmed the existence of this issue with Sophos Anti-Virus 5.1 for Windows as well as version 5 for Linux. It is suspected that earlier versions and other architectures are also vulnerable.
iDefense is unaware for any effective workarounds for this issue.
VI. VENDOR RESPONSE
Sophos recommends upgrading to an unaffected version of the scan engine. For more information consult the following support article. http://www.sophos.com/support/knowledgebase/article/7609.html
VII. CVE INFORMATION
The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2006-4839 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org), which standardizes names for security problems.
VIII. DISCLOSURE TIMELINE
09/15/2006 Initial vendor notification 09/19/2006 Initial vendor response 10/31/2006 Coordinated public disclosure
This vulnerability was reported to iDefense by Damian Put <firstname.lastname@example.org>.
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X. LEGAL NOTICES
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