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Gentoo Linux Security Advisory                           GLSA 200611-09
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http://security.gentoo.org/ 
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  Severity: Normal
     Title: libpng: Denial of Service
      Date: November 17, 2006
      Bugs: #154380
        ID: 200611-09

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Synopsis
=======
A vulnerability in libpng may allow a remote attacker to crash
applications that handle untrusted images.

Background
=========
libpng is a free ANSI C library used to process and manipulate PNG
images.

Affected packages
================
    -------------------------------------------------------------------
     Package            /  Vulnerable  /                    Unaffected
    -------------------------------------------------------------------
  1  media-libs/libpng      < 1.2.13                         >= 1.2.13

Description
==========
Tavis Ormandy of the Gentoo Linux Security Audit Team discovered that a
vulnerability exists in the sPLT chunk handling code of libpng, a large
sPLT chunk may cause an application to attempt to read out of bounds.

Impact
=====
A remote attacker could craft an image that when processed or viewed by
an application using libpng causes the application to terminate
abnormally.

Workaround
=========
There is no known workaround at this time.

Resolution
=========
All libpng users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=media-libs/libpng-1.2.13"

References
=========
  [ 1 ] CVE-2006-5793
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-5793 

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

http://security.gentoo.org/glsa/glsa-200611-09.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/2.5 

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