ClamAV: Heap buffer overflow

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200608-13 / clamav
Release Date	August 08, 2006
Latest Revision	August 08, 2006: 02
Impact	high
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
app-antivirus/clamav	< 0.88.4	>= 0.88.4	All supported architectures

Related bugreports: #143093

Synopsis

ClamAV is vulnerable to a heap-based buffer overflow resulting in a Denial of Service and potentially remote execution of arbitrary code.

2. Impact Information

Background

ClamAV is a GPL virus scanner.

Description

Damian Put has discovered a boundary error in the pefromupx() function used by the UPX extraction module, which unpacks PE Windows executable files. Both the "clamscan" command-line utility and the "clamd" daemon are affected.

Impact

By sending a malicious attachment to a mail server running ClamAV, a remote attacker can cause a Denial of Service and potentially the execution of arbitrary code with the permissions of the user running ClamAV.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All ClamAV users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=app-antivirus/clamav-0.88.4"

4. References

Updated August 08, 2006

Summary: This is a Gentoo Linux Security Advisory

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