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Gentoo Linux Security Advisory                           GLSA 200903-12
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: OptiPNG: User-assisted execution of arbitrary code
      Date: March 09, 2009
      Bugs: #260265
        ID: 200903-12

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Synopsis
========

A vulnerability in OptiPNG might result in user-assisted execution of
arbitrary code.

Background
==========

OptiPNG is a PNG optimizer that recompresses image files to a smaller
size, without losing any information.

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

    -------------------------------------------------------------------
     Package            /  Vulnerable  /                    Unaffected
    -------------------------------------------------------------------
  1  media-gfx/optipng     < 0.6.2-r1                      >= 0.6.2-r1

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

Roy Tam reported a use-after-free vulnerability in the
GIFReadNextExtension() function in lib/pngxtern/gif/gifread.c leading
to a memory corruption when reading a GIF image.

Impact
======

A remote attacker could entice a user to process a specially crafted
GIF image, possibly resulting in the execution of arbitrary code with
the privileges of the user running the application, or a Denial of
Service.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All OptiPNG users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose
 ">=media-gfx/optipng-0.6.2-r1"

References
==========

  [ 1 ] CVE-2009-0749
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0749

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

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

  http://security.gentoo.org/glsa/glsa-200903-12.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 2009 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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