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<?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>October 14, 2007</announced>
<revised>October 14, 2007: 01</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 &quot;&gt;=x11-base/xorg-server-1.3.0.0-r1&quot;</code>
</resolution>
<references>
<uri link="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-4730">CVE-2007-4730</uri>
</references>
<metadata tag="requester" timestamp="Tue, 02 Oct 2007 20:35:12 +0000">
p-y
</metadata>
<metadata tag="bugReady" timestamp="Tue, 02 Oct 2007 20:35:33 +0000">
p-y
</metadata>
<metadata tag="submitter" timestamp="Mon, 08 Oct 2007 00:30:05 +0000">
rbu
</metadata>
</glsa>