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Gentoo Linux Security Advisory                           GLSA 201502-10
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                                            http://security.gentoo.org/
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 Severity: Normal
    Title: libpng: User-assisted execution of arbitrary code
     Date: February 15, 2015
     Bugs: #531264, #533358
       ID: 201502-10

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Synopsis
========

Two vulnerabilities have been found in libpng, possibly resulting in
execution of arbitrary code.

Background
==========

libpng is a standard library used to process PNG (Portable Network
Graphics) images. It is used by several programs, including web
browsers and potentially server processes.

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

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  media-libs/libpng            < 1.6.16                  >= 1.6.16
                                                           *>= 1.5.21
                                                           *>= 1.2.52

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

Two vulnerabilities have been discovered in libpng:

* The png_user_version_check function contains an out-of-bounds memory
  access error (libpng 1.6.15 Release Notes)
* The png_combine_row function contains an integer overflow error,
  which could result in a heap-based buffer overflow (CVE-2014-9495)

Impact
======

A context-dependent attacker could entice a user to open a specially
crafted PNG file using an application linked against libpng, possibly
resulting in execution of arbitrary code.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All libpng 1.6 users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=media-libs/libpng-1.6.16"

All libpng 1.5 users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=media-libs/libpng-1.5.21"

References
==========

[ 1 ] CVE-2014-9495
      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2014-9495
[ 2 ] libpng 1.6.15 Release Notes
      http://www.libpng.org/pub/png/src/libpng-1.6.15-README.txt

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

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

 http://security.gentoo.org/glsa/glsa-201502-10.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
https://bugs.gentoo.org.

License
=======

Copyright 2015 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