GLSA 200710-16: X.Org X server: Composite local privilege escalation
Severity: | high |
Title: | X.Org X server: Composite local privilege escalation |
Date: | 10/14/2007 |
Bugs: |
|
ID: | 200710-16 |
Synopsis
A vulnerability has been discovered in the Composite extension of the X.Org X server, allowing for a local privilege escalation.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 | < 1.3.0.0-r1 | >= 1.3.0.0-r1 | All supported architectures |
Description
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.
Impact
A local attacker could execute arbitrary code with the privileges of the user running the X server, typically root.
Workaround
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.
Resolution
All X.Org X server users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose ">=x11-base/xorg-server-1.3.0.0-r1"
References
Availability
This GLSA and any updates to it are available for viewing at the Gentoo Security Website:
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.
License
Copyright 2010 Gentoo Foundation, Inc; referenced text belongs to its owner(s). The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license.