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Gentoo Linux Security Advisory                           GLSA 200505-16
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: ImageMagick, GraphicsMagick: Denial of Service
            vulnerability
      Date: May 21, 2005
      Bugs: #90423, #90595
        ID: 200505-16

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Synopsis
========

ImageMagick and GraphicsMagick utilities can be abused to perform a
Denial of Service attack.

Background
==========

Both ImageMagick and GraphicsMagick are collection of tools to read,
write and manipulate images in many formats.

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

    -------------------------------------------------------------------
     Package                   /  Vulnerable  /             Unaffected
    -------------------------------------------------------------------
  1  media-gfx/imagemagick         < 6.2.2.3                >= 6.2.2.3
  2  media-gfx/graphicsmagick     < 1.1.6-r1               >= 1.1.6-r1
    -------------------------------------------------------------------
     2 affected packages on all of their supported architectures.
    -------------------------------------------------------------------

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

Tavis Ormandy of the Gentoo Linux Security Audit Team discovered a
Denial of Service vulnerability in the XWD decoder of ImageMagick and
GraphicsMagick when setting a color mask to zero.

Impact
======

A remote attacker could submit a specially crafted image to a user or
an automated system making use of an affected utility, resulting in a
Denial of Service by consumption of CPU time.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All ImageMagick users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=media-gfx/imagemagick-6.2.2.3"

All GraphicsMagick users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=media-gfx/graphicsmagick-1.1.6-r1"

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

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

  http://security.gentoo.org/glsa/glsa-200505-16.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 2005 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/2.0