Clam AntiVirus: Integer overflows

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

Neel Mehta and Alex Wheeler discovered that Clam AntiVirus is vulnerable to integer overflows when handling the TNEF, CHM and FSG file formats.

Impact

By sending a specially-crafted file an attacker could execute arbitrary code with the permissions of the user running Clam AntiVirus.

Workaround

There is no known workaround at this time.

Resolution

All Clam AntiVirus users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=app-antivirus/clamav-0.86.2"