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Release mode: Coordinated but limited disclosure.
Ref : [TZO-40-2009] - Clamav generic evasion (RAR,ZIP)
Vendor : &
Status : Patched (in version 0.95.2)
CVE : none provided
Credit : Discovered - froggz 2005, Zoller 2007, ROGER Mickael 2009
Security notification reaction rating : good

Disclosure Policy :

Affected products :
  • ClamAV below 0.95.2
Affected systems:
  •   MACOSX server
  • IBM Secure E-mail Express Solution for System

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,RAR,ZIP 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

No timeline for this bug, nothing of particular note.


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