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UNIRAS Brief - 765/06 - Gentoo Linux Security Advisory: GLSA 200611-09 - libpng: Denial of Service



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 UNIRAS (UK Government CERT) Briefing - 765/06 dated 20.11.06 time 15:10
 UNIRAS is part of NISCC (the UK National Infrastructure Security
 Co-ordination Centre)
______________________________________________________________________________

 UNIRAS material is available from the NISCC website at www.niscc.gov.uk
______________________________________________________________________________

Title
=====

Gentoo Linux Security Advisory: GLSA 200611-09 - libpng: Denial of Service

Detail
======

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.


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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@xxxxxxxxxx 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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______________________________________________________________________________

UNIRAS wishes to acknowledge the contributions of Gentoo for the
information contained in this briefing.
______________________________________________________________________________

This notice contains information released by the original author.
Some of the information may have changed since it was released. If the
vulnerability affects you, it may be prudent to retrieve the advisory
from the site of the original source to ensure that you receive the most
current information concerning that problem.

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<End of UNIRAS Briefing>

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