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Sophos Anti-Virus Zip Archive Virus Detection Bypass
Secunia Advisory: SA12875
Release Date: 2004-10-20
Popularity: 7,489 views

Critical:
Not critical
Impact: Security Bypass
Where: From remote
Solution Status: Partial Fix

Software:Sophos Anti-Virus 3.x

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CVE reference:CVE-2004-0937


Description:
A weakness has been reported in Sophos Anti-Virus, which can be exploited by malware to bypass certain scanning functionality.

The problem is caused due to an error when parsing .zip archive headers and can be exploited via a specially crafted .zip archive where the uncompressed size of the archived file has been modified within the local and global headers.

Successful exploitation causes malware in a specially crafted .zip archive to pass the scanning functionality undetected.

NOTE: This is not a critical issue on client systems, as the malware still is detected upon execution by the desktop on-access scanner.

Solution:
The problem has been fixed in version 3.87.0 of Sophos Anti-Virus on all operating system platforms except Windows 95/98/Me.

Sophos Anti-Virus for Windows 95/98/Me will be updated with the fix from version 3.88.0 (available from 24 November 2004).

Filter all compressed file archives (.zip) at border gateways.

Provided and/or discovered by:
Discovered by anonymous person and reported via iDEFENSE.

Original Advisory:
Sophos:
http://sophos.com/support/knowledgebase/article/2074.html

iDEFENSE:
http://www.idefense.com/application/poi/display?id=153&type=vulnerabilities


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