Gentoo Logo

zgv, xzgv: Heap overflow


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200604-10 / xzgv
Release Date April 21, 2006
Latest Revision June 10, 2006: 02
Impact normal
Exploitable remote
Package Vulnerable versions Unaffected versions Architecture(s)
media-gfx/xzgv < 0.8-r2 >= 0.8-r2 All supported architectures
media-gfx/zgv < 5.9 >= 5.9 All supported architectures

Related bugreports: #127008


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

2.  Impact Information


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


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.


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.

3.  Resolution Information


There is no known workaround at this time.


All xzgv users should upgrade to the latest version:

Code Listing 3.1: Resolution

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

All zgv users should also upgrade to the latest version:

Code Listing 3.2: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=media-gfx/zgv-5.9"

4.  References


Page updated April 21, 2006

Summary: This is a Gentoo Linux Security Advisory

Security Team
Contact Address

Donate to support our development efforts.

Copyright 2001-2015 Gentoo Foundation, Inc. Questions, Comments? Contact us.