GLSA 200407-06 - libpng: Buffer overflow on row buffers
Posted on: 07/08/2004 11:42 AM

A libpng update is available for Gentoo Linux

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Gentoo Linux Security Advisory GLSA 200407-06
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http://security.gentoo.org/
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Severity: Normal
Title: libpng: Buffer overflow on row buffers
Date: July 08, 2004
Bugs: #56307
ID: 200407-06

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Synopsis
=======

libpng contains a buffer overflow vulnerability potentially allowing an attacker to perform a Denial of Service attack or even execute arbitrary code.

Background
=========

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

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

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Package / Vulnerable / Unaffected
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1 media-libs/libpng <= 1.2.5-r6 >= 1.2.5-r7

Description
==========

Due to a wrong calculation of loop offset values, libpng contains a buffer overflow vulnerability on the row buffers. This vulnerability was initially patched in January 2003 but since it has been discovered that libpng contains the same vulnerability in two other places.

Impact
=====

An attacker could exploit this vulnerability to cause programs linked against the library to crash or execute arbitrary code with the permissions of the user running the vulnerable program, which could be the root user.

Workaround
=========

There is no known workaround at this time. All users are encouraged to upgrade to the latest available version.

Resolution
=========

All libpng users should upgrade to the latest stable version:

# emerge sync

# emerge -pv ">=media-libs/libpng-1.2.5-r7"
# emerge ">=media-libs/libpng-1.2.5-r7"

You should also run revdep-rebuild to rebuild any packages that depend on older versions of libpng :

# revdep-rebuild

References
=========

[ 1 ] CAN-2002-1363
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-1363

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

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

http://security.gentoo.org/glsa/glsa-200407-06.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 http://bugs.gentoo.org.

License
======

Copyright 2004 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/1.0


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