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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