glsa-200710-11.xml


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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="200710-11">
  <title>X Font Server: Multiple Vulnerabilities</title>
  <synopsis>
    Three vulnerabilities have been discovered in the X Font Server possibly
    allowing local attackers to gain elevated privileges.
  </synopsis>
  <product type="ebuild">xfs</product>
  <announced>2007-10-12</announced>
  <revised count="01">2007-10-12</revised>
  <bug>185660</bug>
  <bug>194606</bug>
  <access>local</access>
  <affected>
    <package name="x11-apps/xfs" auto="yes" arch="*">
      <unaffected range="ge">1.0.5</unaffected>
      <vulnerable range="lt">1.0.5</vulnerable>
    </package>
  </affected>
  <background>
    <p>
    The X.Org X11 X Font Server provides a standard mechanism for an X
    server to communicate with a font renderer.
    </p>
  </background>
  <description>
    <p>
    iDefense reported that the xfs init script does not correctly handle a
    race condition when setting permissions of a temporary file
    (CVE-2007-3103). Sean Larsson discovered an integer overflow
    vulnerability in the build_range() function possibly leading to a
    heap-based buffer overflow when handling "QueryXBitmaps" and
    "QueryXExtents" protocol requests (CVE-2007-4568). Sean Larsson also
    discovered an error in the swap_char2b() function possibly leading to a
    heap corruption when handling the same protocol requests
    (CVE-2007-4990).
    </p>
  </description>
  <impact type="high">
    <p>
    The first issue would allow a local attacker to change permissions of
    arbitrary files to be world-writable by performing a symlink attack.
    The second and third issues would allow a local attacker to execute
    arbitrary code with privileges of the user running the X Font Server,
    usually xfs.
    </p>
  </impact>
  <workaround>
    <p>
    There is no known workaround at this time.
    </p>
  </workaround>
  <resolution>
    <p>
    All X Font Server users should upgrade to the latest version:
    </p>
    <code>
    # emerge --sync
    # emerge --ask --oneshot --verbose "&gt;=x11-apps/xfs-1.0.5"</code>
  </resolution>
  <references>
    <uri link="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-3103">CVE-2007-3103</uri>
    <uri link="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-4568">CVE-2007-4568</uri>
    <uri link="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-4990">CVE-2007-4990</uri>
  </references>
  <metadata tag="requester" timestamp="2007-10-11T20:30:03Z">
    rbu
  </metadata>
  <metadata tag="submitter" timestamp="2007-10-11T21:39:17Z">
    rbu
  </metadata>
  <metadata tag="bugReady" timestamp="2007-10-11T21:39:34Z">
    rbu
  </metadata>
</glsa>