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Gentoo Linux Security Advisory                           GLSA 200710-07
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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
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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