- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 200801-09 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - http://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: High Title: X.Org X server and Xfont library: Multiple vulnerabilities Date: January 20, 2008 Bugs: #204362 ID: 200801-09 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Synopsis ======== Multiple vulnerabilities have been discovered in the X.Org X server and Xfont library, allowing for a local privilege escalation and arbitrary code execution. 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-r4 >= 1.3.0.0-r4 2 x11-libs/libxfont < 1.3.1-r1 >= 1.3.1-r1 ------------------------------------------------------------------- 2 affected packages on all of their supported architectures. ------------------------------------------------------------------- Description =========== regenrecht reported multiple vulnerabilities in various X server extension via iDefense: * The XFree86-Misc extension does not properly sanitize a parameter within a PassMessage request, allowing the modification of a function pointer (CVE-2007-5760). * Multiple functions in the XInput extension do not properly sanitize client requests for swapping bytes, leading to corruption of heap memory (CVE-2007-6427). * Integer overflow vulnerabilities in the EVI extension and in the MIT-SHM extension can lead to buffer overflows (CVE-2007-6429). * The TOG-CUP extension does not sanitize an index value in the ProcGetReservedColormapEntries() function, leading to arbitrary memory access (CVE-2007-6428). * A buffer overflow was discovered in the Xfont library when processing PCF font files (CVE-2008-0006). * The X server does not enforce restrictions when a user specifies a security policy file and attempts to open it (CVE-2007-5958). Impact ====== Remote attackers could exploit the vulnerability in the Xfont library by enticing a user to load a specially crafted PCF font file resulting in the execution of arbitrary code with the privileges of the user running the X server, typically root. Local attackers could exploit this and the vulnerabilities in the X.org extensions to gain elevated privileges. If the X server allows connections from the network, these vulnerabilities could be exploited remotely. A local attacker could determine the existence of arbitrary files by exploiting the last vulnerability or possibly cause a Denial of Service. Workaround ========== Workarounds for some of the vulnerabilities can be found in the X.Org security advisory as listed under References. 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-r4" All X.Org Xfont library users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=x11-libs/libXfont-1.3.1-r1" References ========== [ 1 ] CVE-2007-5760 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-5760 [ 2 ] CVE-2007-5958 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-5958 [ 3 ] CVE-2007-6427 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-6427 [ 4 ] CVE-2007-6428 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-6428 [ 5 ] CVE-2007-6429 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-6429 [ 6 ] CVE-2008-0006 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-0006 [ 7 ] X.Org security advisory http://lists.freedesktop.org/archives/xorg/2008-January/031918.html Availability ============ This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200801-09.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@xxxxxxxxxx or alternatively, you may file a bug at http://bugs.gentoo.org. License ======= Copyright 2008 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
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