[ GLSA 200906-01 ] libpng: Information disclosure

[Tobias Heinlein <keytoaster () gentoo org>]

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Gentoo Linux Security Advisory                           GLSA 200906-01
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                                            http://security.gentoo.org/
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  Severity: Low
     Title: libpng: Information disclosure
      Date: June 27, 2009
      Bugs: #272970
        ID: 200906-01

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Synopsis
========

A vulnerability has been discovered in libpng that allows for
information disclosure.

Background
==========

libpng is the official PNG reference library used to read, write and
manipulate PNG images.

Affected packages
=================

    -------------------------------------------------------------------
     Package            /  Vulnerable  /                    Unaffected
    -------------------------------------------------------------------
  1  media-libs/libpng      < 1.2.37                         >= 1.2.37

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

Jeff Phillips discovered that libpng does not properly parse 1-bit
interlaced images with width values that are not divisible by 8, which
causes libpng to include uninitialized bits in certain rows of a PNG
file.

Impact
======

A remote attacker might entice a user to open a specially crafted PNG
file, possibly resulting in the disclosure of sensitive memory
portions.

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-1.2.37"

References
==========

  [ 1 ] CVE-2009-2042
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-2042

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

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

  http://security.gentoo.org/glsa/glsa-200906-01.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 2009 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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