<?xml version="1.0" encoding="utf-8"?> <!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd"> <glsa id="200710-16"> <title>X.Org X server: Composite local privilege escalation</title> <synopsis> A vulnerability has been discovered in the Composite extension of the X.Org X server, allowing for a local privilege escalation. </synopsis> <product type="ebuild">X.Org</product> <announced>2007-10-14</announced> <revised count="01">2007-10-14</revised> <bug>191964</bug> <access>local</access> <affected> <package name="x11-base/xorg-server" auto="yes" arch="*"> <unaffected range="ge">1.3.0.0-r1</unaffected> <vulnerable range="lt">1.3.0.0-r1</vulnerable> </package> </affected> <background> <p> The X Window System is a graphical windowing system based on a client/server model. </p> </background> <description> <p> 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. </p> </description> <impact type="high"> <p> A local attacker could execute arbitrary code with the privileges of the user running the X server, typically root. </p> </impact> <workaround> <p> Disable the Composite extension by setting ' Option "Composite" "disable" ' in the Extensions section of xorg.conf. </p> <p> Note: This could affect the functionality of some applications. </p> </workaround> <resolution> <p> All X.Org X server users should upgrade to the latest version: </p> <code> # emerge --sync # emerge --ask --oneshot --verbose ">=x11-base/xorg-server-1.3.0.0-r1"</code> </resolution> <references> <uri link="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-4730">CVE-2007-4730</uri> </references> <metadata tag="requester" timestamp="2007-10-02T20:35:12Z"> p-y </metadata> <metadata tag="bugReady" timestamp="2007-10-02T20:35:33Z"> p-y </metadata> <metadata tag="submitter" timestamp="2007-10-08T00:30:05Z"> rbu </metadata> </glsa>