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Gentoo: zgv, xzgv Heap overflow Print E-mail
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Posted by Benjamin D. Thomas   
Gentoo xzgv and zgv attempt to decode JPEG images within the CMYK/YCCK colour space incorrectly, potentially resulting in the execution of arbitrary code.
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Gentoo Linux Security Advisory                           GLSA 200604-10
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: zgv, xzgv: Heap overflow
      Date: April 21, 2006
      Bugs: #127008
        ID: 200604-10

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Synopsis
========

xzgv and zgv attempt to decode JPEG images within the CMYK/YCCK colour
space incorrectly, potentially resulting in the execution of arbitrary
code.

Background
==========

xzgv and zgv are picture viewing utilities with a thumbnail based file
selector.

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

    -------------------------------------------------------------------
     Package         /  Vulnerable  /                       Unaffected
    -------------------------------------------------------------------
  1  media-gfx/xzgv      < 0.8-r2                            >= 0.8-r2
  2  media-gfx/zgv         < 5.8                                >= 5.8
    -------------------------------------------------------------------
     2 affected packages on all of their supported architectures.
    -------------------------------------------------------------------

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

Andrea Barisani of Gentoo Linux discovered xzgv and zgv allocate
insufficient memory when rendering images with more than 3 output
components, such as images using the YCCK or CMYK colour space. When
xzgv or zgv attempt to render the image, data from the image overruns a
heap allocated buffer.

Impact
======

An attacker may be able to construct a malicious image that executes
arbitrary code with the permissions of the xzgv or zgv user when
attempting to render the image.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All xzgv users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=media-gfx/xzgv-0.8-r2"

All zgv users should also upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=media-gfx/zgv-5.8"

References
==========

  [ 1 ] CVE-2006-1060
        http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-1060

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

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

  http://security.gentoo.org/glsa/glsa-200604-10.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 2006 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
 
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