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

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

Affected Packages

x11-base/xorg-server on all architectures
Affected versions < 1.1.1-r4
Unaffected versions >= 1.1.1-r4

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.

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

Release Date
January 27, 2007

Latest Revision
February 26, 2007: 02

Severity
normal

Exploitable
local

Bugzilla entries