glsa-200710-16.xml


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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>