GLSA 200702-12 CHMlib: User-assisted remote execution of arbitrary code

Gentoo Linux Security Advisory GLSA 200702-12
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http://security.gentoo.org/
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Severity: Normal
Title: CHMlib: User-assisted remote execution of arbitrary code
Date: February 27, 2007
Bugs: #163989
ID: 200702-12

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Synopsis
========

A memory corruption vulnerability in CHMlib could lead to the remote
execution of arbitrary code.

Background
==========

CHMlib is a library for the MS CHM (Compressed HTML) file format plus
extracting and HTTP server utils.

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

-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 app-doc/chmlib lt; 0.39 gt;= 0.39

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

When certain CHM files that contain tables and objects stored in pages
are parsed by CHMlib, an unsanitized value is passed to the alloca()
function resulting in a shift of the stack pointer to arbitrary memory
locations.

Impact
======

An attacker could entice a user to open a specially crafted CHM file,
resulting in the execution of arbitrary code with the permissions of
the user viewing the file.

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 "gt;=app-doc/chmlib-0.39"

References
==========

[ 1 ] Original Advisory
http://labs.idefense.com/intelligence/vulnerabilities/display.php?idF8
[ 2 ] CVE-2007-0619
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-0619

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

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

http://security.gentoo.org/glsa/glsa-200702-12.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