From: Raphael Marichez (falcogentoo.org)
Date: Fri Jun 15 2007 - 11:35:10 CDT

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Gentoo Linux Security Advisory GLSA 200706-05
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: ClamAV: Multiple Denials of Service
      Date: June 15, 2007
      Bugs: #178082
        ID: 200706-05

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Synopsis
========

ClamAV contains several vulnerabilities leading to a Denial of Service.

Background
==========

ClamAV is a GPL virus scanner.

Affected packages
=================

    -------------------------------------------------------------------
     Package / Vulnerable / Unaffected
    -------------------------------------------------------------------
  1 app-antivirus/clamav < 0.90.3 >= 0.90.3

Description
===========

Several vulnerabilities were discovered in ClamAV by various
researchers:

* Victor Stinner (INL) discovered that the OLE2 parser may enter in
  an infinite loop (CVE-2007-2650).

* A boundary error was also reported by an anonymous researcher in
  the file unsp.c, which might lead to a buffer overflow
  (CVE-2007-3023).

* The file unrar.c contains a heap-based buffer overflow via a
  modified vm_codesize value from a RAR file (CVE-2007-3123).

* The RAR parsing engine can be bypassed via a RAR file with a header
  flag value of 10 (CVE-2007-3122).

* The cli_gentempstream() function from clamdscan creates temporary
  files with insecure permissions (CVE-2007-3024).

Impact
======

A remote attacker could send a specially crafted file to the scanner,
possibly triggering one of the vulnerabilities. The two buffer
overflows are reported to only cause Denial of Service. This would lead
to a Denial of Service by CPU consumption or a crash of the scanner.
The insecure temporary file creation vulnerability could be used by a
local user to access sensitive data.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All ClamAV users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=app-antivirus/clamav-0.90.3"

References
==========

  [ 1 ] CVE-2007-2650
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-2650
  [ 2 ] CVE-2007-3023
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-3023
  [ 3 ] CVE-2007-3024
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-3024
  [ 4 ] CVE-2007-3122
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-3122
  [ 5 ] CVE-2007-3123
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-3123

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

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

  http://security.gentoo.org/glsa/glsa-200706-05.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

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