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Gentoo Linux Security Advisory GLSA 200511-23
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http://security.gentoo.org/
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Severity: Normal
Title: chmlib, KchmViewer: Stack-based buffer overflow
Date: November 28, 2005
Bugs: #110557
ID: 200511-23
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Synopsis
========
chmlib and KchmViewer contain a buffer overflow vulnerability which may
lead to the execution of arbitrary code.
Background
==========
chmlib is a library for dealing with Microsoft ITSS and CHM format
files. KchmViewer is a CHM viewer that includes its own copy of the
chmlib library.
Affected packages
=================
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 app-doc/chmlib < 0.37.4 >= 0.37.4
2 app-doc/kchmviewer < 1.1 >= 1.1
-------------------------------------------------------------------
2 affected packages on all of their supported architectures.
-------------------------------------------------------------------
Description
===========
Sven Tantau reported about a buffer overflow vulnerability in chmlib.
The function "_chm_decompress_block()" does not properly perform
boundary checking, resulting in a stack-based buffer overflow.
Impact
======
By convincing a user to open a specially crafted ITSS or CHM file,
using KchmViewer or a program makes use of chmlib, a remote attacker
could execute arbitrary code with the privileges of the user running
the software.
Workaround
==========
There is no known workaround at this time.
Resolution
==========
All chmlib users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=app-doc/chmlib-0.37.4"
All KchmViewer users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=app-doc/kchmviewer-1.1"
References
==========
[ 1 ] CVE-2005-3318
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-3318
Availability
============
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
http://security.gentoo.org/glsa/glsa-200511-23.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 2005 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/2.0
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