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Gentoo Linux Security Advisory GLSA 200710-16 |
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http://security.gentoo.org/ |
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Severity: High |
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Title: X.Org X server: Composite local privilege escalation |
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Date: October 14, 2007 |
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Bugs: #191964 |
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ID: 200710-16 |
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Synopsis |
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======== |
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|
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A vulnerability has been discovered in the Composite extension of the |
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X.Org X server, allowing for a local privilege escalation. |
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|
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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-r1 >= 1.3.0.0-r1 |
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|
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Description |
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=========== |
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|
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Aaron Plattner discovered a buffer overflow in the compNewPixmap() |
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function when copying data from a large pixel depth pixmap into a |
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smaller pixel depth pixmap. |
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|
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Impact |
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====== |
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|
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A local attacker could execute arbitrary code with the privileges of |
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the user running the X server, typically root. |
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|
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Workaround |
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========== |
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|
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Disable the Composite extension by setting ' Option "Composite" |
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"disable" ' in the Extensions section of xorg.conf. |
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Note: This could affect the functionality of some applications. |
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|
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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-r1" |
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|
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References |
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========== |
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|
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[ 1 ] CVE-2007-4730 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-4730 |
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|
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Availability |
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============ |
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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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|
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http://security.gentoo.org/glsa/glsa-200710-16.xml |
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|
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Concerns? |
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========= |
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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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|
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License |
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======= |
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|
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Copyright 2007 Gentoo Foundation, Inc; referenced text |
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belongs to its owner(s). |
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|
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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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http://creativecommons.org/licenses/by-sa/2.5 |
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