GLSA 200703-03: ClamAV: Denial of Service

http://security.gentoo.org/

Severity:	normal
Title:	ClamAV: Denial of Service
Date:	03/02/2007
Bugs:	#167201
ID:	200703-03

Synopsis

ClamAV contains two vulnerabilities allowing a Denial of Service.

Background

ClamAV is a GPL virus scanner.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
app-antivirus/clamav	< 0.90	>= 0.90	All supported architectures

Description

An anonymous researcher discovered a file descriptor leak error in the processing of CAB archives and a lack of validation of the "id" parameter string used to create local files when parsing MIME headers.

Impact

A remote attacker can send several crafted CAB archives with a zero-length record header that will fill the available file descriptors until no other is available, which will prevent ClamAV from scanning most archives. An attacker can also send an email with specially crafted MIME headers to overwrite local files with the permissions of the user running ClamAV, such as the virus database file, which could prevent ClamAV from detecting any virus.

Workaround

The first vulnerability can be prevented by refusing any file of type CAB, but there is no known workaround for the second issue.

Resolution

All ClamAV users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=app-antivirus/clamav-0.90"

References

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200703-03.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.