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[gentoo-announce] [ GLSA 201502-10 ] libpng: User-assisted execution of arbitrary code

Posted on 15 February 2015
Gentoo-announce

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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



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