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Date: Mon, 15 Oct 2007 00:38:27 +0200 From: Pierre-Yves Rofes <py@...too.org> To: gentoo-announce@...too.org Cc: full-disclosure@...ts.grok.org.uk, bugtraq@...urityfocus.com, security-alerts@...uxsecurity.com Subject: [ GLSA 200710-16 ] X.Org X server: Composite local privilege escalation -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 200710-16 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - http://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 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-4730 Availability ============ This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200710-16.xml 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@...too.org or alternatively, you may file a bug at http://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. http://creativecommons.org/licenses/by-sa/2.5 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFHEppiuhJ+ozIKI5gRAmOeAJ46xK+4nH8LWGxbNmnlmPrltBqsHgCfUTNK 8qUzM6SvnXk2c2yZgp50GTk= =DiOR -----END PGP SIGNATURE----- _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/
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