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X.Org X server: Multiple vulnerabilities


1.  Gentoo Linux Security Advisory

Version Information

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


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

2.  Impact Information


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


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


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

3.  Resolution Information


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.


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


Page updated January 27, 2007

Summary: This is a Gentoo Linux Security Advisory

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