[ GLSA 200903-12 ] OptiPNG: User-assisted execution of arbitrary code

[Robert Buchholz <rbu () gentoo org>]

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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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