From: Raphael Marichez (falcogentoo.org)
Date: Sun Oct 07 2007 - 17:06:09 CDT

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Gentoo Linux Security Advisory GLSA 200710-07
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: Tk: Buffer overflow
      Date: October 07, 2007
      Bugs: #192539
        ID: 200710-07

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Synopsis
========

A buffer overflow vulnerability has been discovered in Tk.

Background
==========

Tk is a toolkit for creating graphical user interfaces.

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

    -------------------------------------------------------------------
     Package / Vulnerable / Unaffected
    -------------------------------------------------------------------
  1 dev-lang/tk < 8.4.15-r1 >= 8.4.15-r1

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

Reinhard Max discovered a boundary error in Tk when processing an
interlaced GIF with two frames where the second is smaller than the
first one.

Impact
======

A remote attacker could entice a user to open a specially crafted GIF
image with a Tk-based software, possibly resulting in the execution of
arbitrary code with the privileges of the user running the application.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Tk users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=dev-lang/tk-8.4.15-r1"

References
==========

  [ 1 ] CVE-2007-4851
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-4851

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

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

  http://security.gentoo.org/glsa/glsa-200710-07.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
securitygentoo.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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