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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 < 1.2.17 >= 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 ">=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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