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Gentoo Linux Security Advisory                           GLSA 201408-06
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                                            http://security.gentoo.org/
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 Severity: Normal
    Title: libpng: Multiple vulnerabilities
     Date: August 14, 2014
     Bugs: #503014, #507378
       ID: 201408-06

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Synopsis
========

Multiple vulnerabilities have been discovered in libpng which can allow
a remote attacker to cause a Denial of Service condition.

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            < 1.6.10                  >= 1.6.10 
                                                                < 1.3 
                                                           *>= 1.5.18 

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

The png_push_read_chunk function in pngpread.c in the progressive
decoder enters an infinite loop, when it encounters a zero-length IDAT
chunk. In addition certain integer overflows have been detected and
corrected.

The 1.2 branch is not affected by these vulnerabilities.

Impact
======

A remote attacker could entice a user to open a specially crafted PNG
file using an application linked against libpng, possibly resulting in
Denial of Service.

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-1.6.10"

Users with current installs in the 1.5 branch should also upgrade this
using:
  # emerge --sync
  # emerge --ask --oneshot --verbose ">=media-libs/libpng-1.5.18:1.5"

Packages which depend on this library may need to be recompiled. Tools
such as revdep-rebuild may assist in identifying these packages.

References
==========

[ 1 ] CVE-2013-7353
      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2013-7353
[ 2 ] CVE-2013-7354
      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2013-7354
[ 3 ] CVE-2014-0333
      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2014-0333

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

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

 http://security.gentoo.org/glsa/glsa-201408-06.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 2014 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