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Gentoo: 200710-16 High: X.Org Server Composite Local Escalation

A vulnerability has been discovered in the Composite extension of the X.Org X server, allowing for a local privilege escalation.. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 200710-16 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - https://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: High Title: X.Org X server: Composite local privilege escalation Date: October 14, 2007 Bugs: #191964 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 ------------------------------------------------------------------- 1 x11-base/xorg-server < 1.3.0.0-r1 > = 1.3.0.0-r1 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 ========= [ 1 ] CVE-2007-4730 https://www.cve.org/CVERecord?id=CVE-2007-4730 Availability =========== This GLSA and any updates to it are available for viewing at the Gentoo Security Website: https://security.gentoo.org/glsa/200710-16 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 This email address is being protected from spambots. You need JavaScript enabled to view it. or alternatively, you may file a bug at https://bugs.gentoo.org/. License ====== Copyright 2007 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. https://creativecommons.org/licenses/by-sa/2.5/ -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (GNU/Linux) Comment: Using GnuPG with Mozilla - iD8DBQFHEppiuhJ+ozIKI5gRAmOeAJ46xK+4nH8LWGxbNmnlmPrltBqsHgCfUTNK 8qUzM6SvnXk2c2yZgp50GTk=DiOR -----END PGP SIGNATURE----- . Critical Gentoo alert regarding X.Org server's composite extension posing local privilege escalation risks. Immediate update suggested.. Gentoo Security,X.Org Server,Local Escalation,Composite Extension,Buffer Overflow. . LinuxSecurity.com Team

Oct 15, 2007 Gentoo