[ GLSA 200604-10 ] zgv, xzgv: Heap overflow

[GLSA]

Gentoo Linux Security Advisory

Title: zgv, xzgv: Heap overflow (GLSA 200604-10)
Severity: normal
Exploitable: remote
Date: April 21, 2006
Updated: June 10, 2006
Bug(s): #127008
ID: 200604-10

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: media-gfx/xzgv
Vulnerable: < 0.8-r2
Unaffected: >= 0.8-r2
Architectures: All supported architectures

Package: media-gfx/zgv
Vulnerable: < 5.9
Unaffected: >= 5.9
Architectures: All 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: