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TUCoPS :: Security App Flaws :: c07-2511.htm

ClamAV: Denial of Service



ClamAV: Denial of Service
ClamAV: Denial of Service




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Gentoo Linux Security Advisory                           GLSA 200703-03
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http://security.gentoo.org/ 
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  Severity: Normal
     Title: ClamAV: Denial of Service
      Date: March 02, 2007
      Bugs: #167201
        ID: 200703-03

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Synopsis
=======
ClamAV contains two vulnerabilities allowing a Denial of Service.

Background
=========
ClamAV is a GPL virus scanner.

Affected packages
================
    -------------------------------------------------------------------
     Package               /  Vulnerable  /                 Unaffected
    -------------------------------------------------------------------
  1  app-antivirus/clamav       < 0.90                         >= 0.90

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
=========
  [ 1 ] CVE-2007-0897
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-0897 
  [ 2 ] CVE-2007-0898
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-0898 

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 
http://bugs.gentoo.org. 

License
======
Copyright 2007 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.

http://creativecommons.org/licenses/by-sa/2.5 

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