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Gentoo Linux Security Advisory                           GLSA 200603-18
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                                            https://security.gentoo.org/
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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
        https://security.gentoo.org/glsa/200507-19
  [ 2 ] CVE-2005-1849
        
Availability
===========
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

  https://security.gentoo.org/glsa/200603-18

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
https://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.

https://creativecommons.org/licenses/by-sa/2.0/