GLSA 200701-25: X.Org X server: Multiple vulnerabilities

http://security.gentoo.org/

Severity:	normal
Title:	X.Org X server: Multiple vulnerabilities
Date:	01/27/2007
Bugs:	#157421
ID:	200701-25

Synopsis

Sean Larsson from iDefense Labs has found multiple vulnerabilities in the DBE and Render extensions.

Background

The X Window System is a graphical windowing system based on a client/server model.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
x11-base/xorg-server	< 1.1.1-r4	>= 1.1.1-r4	All supported architectures

Description

Multiple memory corruption vulnerabilities have been found in the ProcDbeGetVisualInfo() and the ProcDbeSwapBuffers() of the DBE extension, and ProcRenderAddGlyphs() in the Render extension.

Impact

A local attacker could execute arbitrary code with the privileges of the user running the X server, typically root.

Workaround

Disable the DBE extension by removing the "Load dbe" directive in the Module section of xorg.conf, and explicitly disable the Render extension with ' Option "RENDER" "disable" ' in the Extensions section.

Note: This could affect the functionality of some applications.

Resolution

All X.Org X server users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=x11-base/xorg-server-1.1.1-r4"

References

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200701-25.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.