Clam AntiVirus: Denial of Service vulnerability

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.

Workaround

There is no known workaround at this time.

Resolution

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

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