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AVG Anti-Virus Engine Malformed ARJ Archive Virus Detection Bypass
Secunia Advisory: SA17186
Release Date: 2005-10-13
Popularity: 8,395 views

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

Software:AVG Antivirus Server

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Description:
fRoGGz has discovered a weakness in AVG Anti-Virus scan engine, which can be exploited by malware to bypass certain scanning functionality.

For more information:
SA17126

The weakness has been confirmed in AVG Email Server Edition version 7.0.344 (267.11.14/131) when scanning an email containing a malformed ".arj" archive with a NULL character prepended to the header. Other versions may also be affected.

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

Solution:
Desktop on-access scanner should be used to ensure that the malware is detected upon extraction.

Filter all compressed file archives at border gateways if they are not required.

Provided and/or discovered by:
fRoGGz, SecuBox Labs

Other References:
SA17126:
http://secunia.com/advisories/17126/


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