GLSA 200705-24 libpng: Denial of Service
Posted on: 05/31/2007 07:40 PM

A new security update has been released for Gentoo Linux - libpng: Denial of Service. Here the announcement:

Gentoo Linux Security Advisory GLSA 200705-24
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http://security.gentoo.org/
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Severity: Normal
Title: libpng: Denial of Service
Date: May 31, 2007
Bugs: #178004
ID: 200705-24

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Synopsis
========

A vulnerability 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 lt; 1.2.17 gt;= 1.2.17

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

Mats Palmgren fixed an error in file pngrutil.c in which the trans[]
array might be not allocated because of images with a bad tRNS chunk
CRC value.

Impact
======

A remote attacker could craft an image that when processed or viewed by
an application using libpng causes the application to terminate
abnormally.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

Please note that due to separate bugs in libpng 1.2.17, Gentoo does not
provide libpng-1.2.17 but libpng-1.2.18. All libpng users should
upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose "gt;=media-libs/libpng-1.2.18"

References
==========

[ 1 ] CVE-2007-2445
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-2445

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

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

http://security.gentoo.org/glsa/glsa-200705-24.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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