[ GLSA 200711-08 ] libpng: Multiple Denials of Service

[Pierre-Yves Rofes <py () gentoo org>]

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Gentoo Linux Security Advisory                           GLSA 200711-08
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: libpng: Multiple Denials of Service
      Date: November 07, 2007
      Bugs: #195261
        ID: 200711-08

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Synopsis
========

Several vulnerabilities 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      < 1.2.21-r3                   >= 1.2.21-r3

Description
===========

An off-by-one error when handling ICC profile chunks in the
png_set_iCCP() function was discovered (CVE-2007-5266). George Cook and
Jeff Phillips reported several errors in pngrtran.c, the use of logical
instead of a bitwise functions and incorrect comparisons
(CVE-2007-5268). Tavis Ormandy reported out-of-bounds read errors in
several PNG chunk handling functions (CVE-2007-5269).

Impact
======

A remote attacker could craft an image that when processed or viewed by
an application using libpng would cause 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-1.2.21-r3"

References
==========

  [ 1 ] CVE-2007-5266
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-5266
  [ 2 ] CVE-2007-5268
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-5268
  [ 3 ] CVE-2007-5269
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-5269

Availability
============

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

  http://security.gentoo.org/glsa/glsa-200711-08.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 2007 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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