GLSA 200604-10: zgv, xzgv: Heap overflow

http://security.gentoo.org/

Severity:	normal
Title:	zgv, xzgv: Heap overflow
Date:	04/21/2006
Bugs:	#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	Vulnerable	Unaffected	Architecture(s)
media-gfx/xzgv	< 0.8-r2	>= 0.8-r2	All supported architectures
media-gfx/zgv	< 5.9	>= 5.9	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:

    # 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-5.9"

References

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 https://bugs.gentoo.org.