zgv, xzgv: Heap overflow

1. Gentoo Linux Security Advisory

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

Synopsis

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

Background

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

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.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

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

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