Clam AntiVirus: Integer overflows

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200507-25 / clamav
Release Date	July 26, 2005
Latest Revision	August 11, 2005: 02
Impact	high
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
app-antivirus/clamav	< 0.86.2	>= 0.86.2	All supported architectures

Related bugreports: #100178

Synopsis

Clam AntiVirus is vulnerable to integer overflows when handling several file formats, potentially resulting in the execution of arbitrary code.

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

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.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All Clam AntiVirus users should upgrade to the latest version:

Code Listing 3.1: Resolution

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

4. References

Page updated July 26, 2005

Summary: This is a Gentoo Linux Security Advisory

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