Clam AntiVirus: Denial of Service vulnerability

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200506-23 / clamav
Release Date	June 27, 2005
Latest Revision	May 22, 2006: 02
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
app-antivirus/clamav	< 0.86.1	>= 0.86.1	All supported architectures

Related bugreports: #96960

Synopsis

Clam AntiVirus is vulnerable to a Denial of Service attack when processing certain Quantum archives.

2. Impact Information

Background

Clam AntiVirus is a GPL anti-virus toolkit, designed for integration with mail servers to perform attachment scanning. Clam AntiVirus also provides a command line scanner and a tool for fetching updates of the virus database.

Description

Andrew Toller and Stefan Kanthak discovered that a flaw in libmspack's Quantum archive decompressor renders Clam AntiVirus vulnerable to a Denial of Service attack.

Impact

A remote attacker could exploit this vulnerability to cause a Denial of Service by sending a specially crafted Quantum archive to the server.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All Clam AntiVirus users should upgrade to the latest available version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=app-antivirus/clamav-0.86.1"

4. References

Page updated June 27, 2005

Summary: This is a Gentoo Linux Security Advisory

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