X.Org X server: Multiple vulnerabilities

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200701-25 / X.Org
Release Date	January 27, 2007
Latest Revision	February 26, 2007: 02
Impact	normal
Exploitable	local

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

Related bugreports: #157421

Synopsis

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

2. Impact Information

Background

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

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.

3. Resolution Information

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:

Code Listing 3.1: Resolution

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

4. References

Updated January 27, 2007

Summary: This is a Gentoo Linux Security Advisory

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