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Gentoo Linux Security Advisory GLSA 200806-07 |
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http://security.gentoo.org/ |
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Severity: High |
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Title: X.Org X server: Multiple vulnerabilities |
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Date: June 19, 2008 |
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Bugs: #225419 |
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ID: 200806-07 |
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Synopsis |
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======== |
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|
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Multiple vulnerabilities have been discovered in the X.Org X server, |
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possibly allowing for the remote execution of arbitrary code with root |
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privileges. |
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Background |
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========== |
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|
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The X Window System is a graphical windowing system based on a |
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client/server model. |
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|
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Affected packages |
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================= |
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|
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------------------------------------------------------------------- |
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Package / Vulnerable / Unaffected |
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------------------------------------------------------------------- |
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1 x11-base/xorg-server < 1.3.0.0-r6 >= 1.3.0.0-r6 |
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|
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Description |
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=========== |
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|
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Regenrecht reported multiple vulnerabilities in various X server |
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extensions via iDefense: |
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|
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* The SProcSecurityGenerateAuthorization() and |
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SProcRecordCreateContext() functions of the RECORD and Security |
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extensions are lacking proper parameter validation (CVE-2008-1377). |
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* An integer overflow is possible in the function ShmPutImage() of |
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the MIT-SHM extension (CVE-2008-1379). |
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|
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* The RENDER extension contains several possible integer overflows in |
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the AllocateGlyph() function (CVE-2008-2360) which could possibly |
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lead to a heap-based buffer overflow. Further possible integer |
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overflows have been found in the ProcRenderCreateCursor() function |
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(CVE-2008-2361) as well as in the SProcRenderCreateLinearGradient(), |
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SProcRenderCreateRadialGradient() and |
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SProcRenderCreateConicalGradient() functions (CVE-2008-2362). |
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|
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Impact |
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====== |
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|
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Exploitation of these vulnerabilities could possibly lead to the remote |
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execution of arbitrary code with root privileges, if the server is |
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running as root, which is the default. It is also possible to crash the |
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server by making use of these vulnerabilities. |
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|
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Workaround |
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========== |
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|
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It is possible to avoid these vulnerabilities by disabling the affected |
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server extensions. Therefore edit the configuration file |
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(/etc/X11/xorg.conf) to contain the following in the appropriate |
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places: |
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|
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Section "Extensions" |
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Option "MIT-SHM" "disable" |
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Option "RENDER" "disable" |
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Option "SECURITY" "disable" |
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EndSection |
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Section "Module" |
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Disable "record" |
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EndSection |
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Resolution |
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========== |
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All X.org X Server users should upgrade to the latest version: |
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# emerge --sync |
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# emerge --ask --oneshot --verbose ">=x11-base/xorg-server-1.3.0.0-r6" |
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|
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References |
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========== |
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[ 1 ] CVE-2008-1377 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1377 |
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[ 2 ] CVE-2008-1379 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1379 |
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[ 3 ] CVE-2008-2360 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2360 |
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[ 4 ] CVE-2008-2361 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2361 |
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[ 5 ] CVE-2008-2362 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2362 |
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|
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Availability |
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============ |
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This GLSA and any updates to it are available for viewing at |
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the Gentoo Security Website: |
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http://security.gentoo.org/glsa/glsa-200806-07.xml |
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Concerns? |
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========= |
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Security is a primary focus of Gentoo Linux and ensuring the |
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confidentiality and security of our users machines is of utmost |
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importance to us. Any security concerns should be addressed to |
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security@g.o or alternatively, you may file a bug at |
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http://bugs.gentoo.org. |
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License |
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======= |
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Copyright 2008 Gentoo Foundation, Inc; referenced text |
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belongs to its owner(s). |
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The contents of this document are licensed under the |
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Creative Commons - Attribution / Share Alike license. |
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|
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http://creativecommons.org/licenses/by-sa/2.5 |
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