GLSA 200703-03: ClamAV: Denial of Service

Title:ClamAV: Denial of Service
Bugs: #167201


ClamAV contains two vulnerabilities allowing a Denial of Service.


ClamAV is a GPL virus scanner.

Affected packages

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


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.


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.


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


All ClamAV users should upgrade to the latest version:

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



This GLSA and any updates to it are available for viewing at the Gentoo Security Website:


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 or alternatively, you may file a bug at


Copyright 2010 Gentoo Foundation, Inc; referenced text belongs to its owner(s). The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license.

Thank you!