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Gentoo Linux Security Advisory                           GLSA 200603-18
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  Severity: Normal
     Title: Pngcrush: Buffer overflow
      Date: March 21, 2006
      Bugs: #123286
        ID: 200603-18

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Synopsis
========

Pngcrush is vulnerable to a buffer overflow which could potentially
lead to the execution of arbitrary code.

Background
==========

Pngcrush is an optimizer for PNG files.

Affected packages
=================

    -------------------------------------------------------------------
     Package             /  Vulnerable  /                   Unaffected
    -------------------------------------------------------------------
  1  media-gfx/pngcrush       < 1.6.2                         >= 1.6.2

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

Carsten Lohrke of Gentoo Linux reported that Pngcrush contains a
vulnerable version of zlib (GLSA 200507-19).

Impact
======

By creating a specially crafted data stream, attackers can overwrite
data structures for applications that use Pngcrush, resulting in a
Denial of Service and potentially arbitrary code execution.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Pngcrush users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=media-gfx/pngcrush-1.6.2"

References
==========

  [ 1 ] GLSA 200507-19
        http://www.gentoo.org/security/en/glsa/glsa-200507-19.xml
  [ 2 ] CVE-2005-1849
        http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-1849

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

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

  http://security.gentoo.org/glsa/glsa-200603-18.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 2006 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/2.0

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