full-disclosure - [ GLSA 200702-12 ] CHMlib: User-assisted remote execution of arbitrary code

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Date: Tue, 27 Feb 2007 16:23:51 +0100
From: Raphael Marichez <falco@...too.org>
To: gentoo-announce@...too.org
Cc: full-disclosure@...ts.grok.org.uk, bugtraq@...urityfocus.com,
	security-alerts@...uxsecurity.com
Subject: [ GLSA 200702-12 ] CHMlib: User-assisted remote
	execution of arbitrary code

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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       < 0.39                               >= 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 ">=app-doc/chmlib-0.39"

References
==========

  [ 1 ] Original Advisory
        http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=468
  [ 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@...too.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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