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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 (at) gentoo (dot) org [email concealed] 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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