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Date: Thu, 18 Jun 2009 16:01:34 +0200
From: Thierry Zoller <>
To: bugtraq <>,,, <>, <>, <>,
Subject: [TZO-43-2009] - Clamav generic evasion (CAB)


                From the low-hanging-fruit-department
                    Clamav generic evasion (CAB)

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Release mode: Coordinated but limited disclosure.
Ref         : [TZO-43-2009] - Clamav generic evasion (CAB)
WWW         : 
Vendor      : &
Status      : Patched (in version 0.95.2)
CVE         : none provided
Security notification reaction rating : good

Disclosure Policy :

Affected products : 
- ClamAV below 0.96

Affected systems:
- MACOSX server,
- IBM Secure E-mail Express Solution for System
Others :

I. Background
Quote: "Clam AntiVirus is an open source (GPL) anti-virus toolkit for UNIX, 
designed especially for e-mail scanning on mail gateways. It provides 
a number of utilities including a flexible and scalable multi-threaded
daemon, a command line scanner and advanced tool for automatic 
database updates. The core of the package is an anti-virus engine 
available in a form of shared library. "

II. Description
The parsing engine can be bypassed by manipulating CAB (Filesize) archives 
in a "certain way" that the Clamav engine cannot extract the content but
the end user is able to. 

III. Impact
To know more about the impact and type of "evasion", I updated the 
description at

IV. Disclosure timeline

Nothing particular too note.

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