Joined: 12 May 2004
|Posted: Sun Oct 14, 2007 11:26 pm Post subject: [ GLSA 200710-16 ] X.Org X server: Composite local privilege
|Gentoo Linux Security Advisory
Title: X.Org X server: Composite local privilege escalation (GLSA 200710-16)
Date: October 14, 2007
A vulnerability has been discovered in the Composite extension of the X.Org X server, allowing for a local privilege escalation.
The X Window System is a graphical windowing system based on a client/server model.
Vulnerable: < 22.214.171.124-r1
Unaffected: >= 126.96.36.199-r1
Architectures: All supported architectures
Aaron Plattner discovered a buffer overflow in the compNewPixmap() function when copying data from a large pixel depth pixmap into a smaller pixel depth pixmap.
A local attacker could execute arbitrary code with the privileges of the user running the X server, typically root.
Disable the Composite extension by setting ' Option "Composite" "disable" ' in the Extensions section of xorg.conf. Note: This could affect the functionality of some applications.
All X.Org X server users should upgrade to the latest version:
|# emerge --sync
# emerge --ask --oneshot --verbose ">=x11-base/xorg-server-188.8.131.52-r1"