ClamAV: Denial of Service

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Gentoo Linux Security Advisory                          
GLSA 200703-03
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                                            http://security.gentoo.or
g/
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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-200
7-0897
  [ 2 ] CVE-2007-0898
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-200
7-0898

Availability
============

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

  ht
tp://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
securitygentoo.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