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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@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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