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bugtraq: [ GLSA 200806-07 ] X.Org X server: Multiple vulnerabili

[ GLSA 200806-07 ] X.Org X server: Multiple vulnerabilities

From: Matthias Geerdsen <vorlon_at_nospam>
Date: Thu Jun 19 2008 - 18:00:32 GMT
To: gentoo-announce@gentoo.org

  • - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 200806-07
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Severity: High Title: X.Org X server: Multiple vulnerabilities Date: June 19, 2008 Bugs: #225419 ID: 200806-07
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Synopsis


Multiple vulnerabilities have been discovered in the X.Org X server, possibly allowing for the remote execution of arbitrary code with root privileges.

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-r6 >= 1.3.0.0-r6

Description


Regenrecht reported multiple vulnerabilities in various X server extensions via iDefense:

  • The SProcSecurityGenerateAuthorization() and SProcRecordCreateContext() functions of the RECORD and Security extensions are lacking proper parameter validation (CVE-2008-1377).
  • An integer overflow is possible in the function ShmPutImage() of the MIT-SHM extension (CVE-2008-1379).
  • The RENDER extension contains several possible integer overflows in the AllocateGlyph() function (CVE-2008-2360) which could possibly lead to a heap-based buffer overflow. Further possible integer overflows have been found in the ProcRenderCreateCursor() function (CVE-2008-2361) as well as in the SProcRenderCreateLinearGradient(), SProcRenderCreateRadialGradient() and SProcRenderCreateConicalGradient() functions (CVE-2008-2362).

Impact


Exploitation of these vulnerabilities could possibly lead to the remote execution of arbitrary code with root privileges, if the server is running as root, which is the default. It is also possible to crash the server by making use of these vulnerabilities.

Workaround


It is possible to avoid these vulnerabilities by disabling the affected server extensions. Therefore edit the configuration file (/etc/X11/xorg.conf) to contain the following in the appropriate places: Section "Extensions" Option "MIT-SHM" "disable" Option "RENDER" "disable" Option "SECURITY" "disable" EndSection Section "Module" Disable "record" EndSection

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-r6"

References


   [ 1 ] CVE-2008-1377
         http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1377    [ 2 ] CVE-2008-1379
         http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1379    [ 3 ] CVE-2008-2360
         http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2360    [ 4 ] CVE-2008-2361
         http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2361    [ 5 ] CVE-2008-2362
         http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2362

Availability


This GLSA and any updates to it are available for viewing at the Gentoo Security Website:

   http://security.gentoo.org/glsa/glsa-200806-07.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@gentoo.org 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