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Clam AntiVirus: Denial of Service vulnerability


1.  Gentoo Linux Security Advisory

Version Information

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


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

2.  Impact Information


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.


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.


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


There is no known workaround at this time.


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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