glsa-201110-19.xml


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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="201110-19">
  <title>X.Org X Server: Multiple vulnerabilities</title>
  <synopsis>Multiple vulnerabilities in the X.Org X server might allow local
    attackers to disclose information.
  </synopsis>
  <product type="ebuild">xorg-server</product>
  <announced>October 22, 2011</announced>
  <revised>October 22, 2011: 2</revised>
  <bug>387069</bug>
  <access>local</access>
  <affected>
    <package name="x11-base/xorg-server" auto="yes" arch="*">
      <unaffected range="rge">1.9.5-r1</unaffected>
      <unaffected range="ge">1.10.4-r1</unaffected>
      <vulnerable range="lt">1.10.4-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>vladz reported the following vulnerabilities in the X.Org X server:</p>
    
    <ul>
      <li>The X.Org X server follows symbolic links when trying to access the
        lock file for a X display, showing a predictable behavior depending on
        the file type of the link target (CVE-2011-4028).
      </li>
      <li>The X.Org X server lock file mechanism allows for a race condition to
        cause the X server to modify the file permissions of an arbitrary file
        to 0444 (CVE-2011-4029).
      </li>
    </ul>
  </description>
  <impact type="normal">
    <p>A local attacker could exploit these vulnerabilities to disclose
      information by making arbitrary files on a system world-readable or gain
      information whether a specified file exists on the system and whether it
      is a file, directory, or a named pipe.
    </p>
  </impact>
  <workaround>
    <p>There is no known workaround at this time.</p>
  </workaround>
  <resolution>
    <p>All X.Org X Server 1.9 users should upgrade to the latest 1.9 version:</p>
    
    <code>
      # emerge --sync
      # emerge --ask --oneshot --verbose "&gt;=x11-base/xorg-server-1.9.5-r1"
    </code>
    
    <p>All X.Org X Server 1.10 users should upgrade to the latest version:</p>
    
    <code>
      # emerge --sync
      # emerge --ask --oneshot --verbose "&gt;=x11-base/xorg-server-1.10.4-r1"
    </code>
    
  </resolution>
  <references>
    <uri link="http://nvd.nist.gov/nvd.cfm?cvename=CVE-2011-4028">CVE-2011-4028</uri>
    <uri link="http://nvd.nist.gov/nvd.cfm?cvename=CVE-2011-4029">CVE-2011-4029</uri>
  </references>
  <metadata timestamp="Thu, 13 Oct 2011 20:53:51 +0000" tag="requester">a3li</metadata>
  <metadata timestamp="Sat, 22 Oct 2011 17:19:57 +0000" tag="submitter">a3li</metadata>
</glsa>