Advisory Text :  

n.runs AG
http://www.nruns.com/
security(at)nruns.com
n.runs-SA-2007.025
24-Aug-2007

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Vendor: ClamAV, http://www.clamav.net
Affected Products: ClamAV,
http://www.clamav.net
Vulnerability : Remote Code Execution
Risk: HIGH

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Vendor communication:

2007/08/10 Initial notification to ClamAV
2007/08/10 ClamAV Responses
2007/08/10 PoC files sent to ClamAV
2007/08/21 ClamAV releases version 0.91.2
2007/08/24 n.runs AG releases a coordinated disclosure advisory

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Overview:

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.

Description:

A remotely exploitable vulnerability has been found in
clamav-milter
when used with sendmail. In detail, the following flaw was
determined:

- Arbitrary code execution due to insecure call to popen()

Impact:

This vulnerability can lead to remote code execution with root
privileges.
Leading to a complete compromise of the vulnerable system.
An attacker can inject shell commands into the recipient field of
sendmail,
if clamav-milter was started with the black hole mode activated.
The vulnerability is present in at least clamav version 0.91.1,
prior
versions may also be affected.

Solution:
A new stable release (clamav 0.91.2) is available at the clamav
website
which
fixes the vulnerability.

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Credit:
Bugs found by Nikolaos Rangos of n.runs AG.
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References:
http://www.clamav.net/download/sources

This Advisory and Upcoming Advisories
http://www.nruns.com/security_advisory.php
http://www.nruns.com/parsing-engines-advisories.php
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including direct,

indirect, incidental, consequential, loss of business profits or
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