glsa-200501-23.xml


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<?xml version="1.0" encoding="utf-8"?>
<?xml-stylesheet href="/xsl/glsa.xsl" type="text/xsl"?>
<?xml-stylesheet href="/xsl/guide.xsl" type="text/xsl"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">

<glsa id="200501-23">
  <title>Exim: Two buffer overflows</title>
  <synopsis>
    Buffer overflow vulnerabilities, which could lead to arbitrary code
    execution, have been found in the handling of IPv6 addresses as well as in
    the SPA authentication mechanism in Exim.
  </synopsis>
  <product type="ebuild">exim</product>
  <announced>January 12, 2005</announced>
  <revised>January 12, 2005: 01</revised>
  <bug>76893</bug>
  <access>remote</access>
  <affected>
    <package name="mail-mta/exim" auto="yes" arch="*">
      <unaffected range="ge">4.43-r2</unaffected>
      <vulnerable range="lt">4.43-r2</vulnerable>
    </package>
  </affected>
  <background>
    <p>
    Exim is an highly configurable message transfer agent (MTA)
    developed at the University of Cambridge.
    </p>
  </background>
  <description>
    <p>
    Buffer overflows have been found in the host_aton() function
    (CAN-2005-0021) as well as in the spa_base64_to_bits() function
    (CAN-2005-0022), which is part of the SPA authentication code.
    </p>
  </description>
  <impact type="high">
    <p>
    A local attacker could trigger the buffer overflow in host_aton()
    by supplying an illegal IPv6 address with more than 8 components, using
    a command line option. The second vulnerability could be remotely
    exploited during SPA authentication, if it is enabled on the server.
    Both buffer overflows can potentially lead to the execution of
    arbitrary code.
    </p>
  </impact>
  <workaround>
    <p>
    There is no known workaround at this time.
    </p>
  </workaround>
  <resolution>
    <p>
    All Exim users should upgrade to the latest version:
    </p>
    <code>
    # emerge --sync
    # emerge --ask --oneshot --verbose &quot;&gt;=mail-mta/exim-4.43-r2&quot;</code>
  </resolution>
  <references>
    <uri link="http://www.exim.org/mail-archives/exim-announce/2005/msg00000.html">Exim Announcement</uri>
    <uri link="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0021">CAN-2005-0021</uri>
    <uri link="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0022">CAN-2005-0022</uri>
  </references>
  <metadata tag="requester" timestamp="Mon, 10 Jan 2005 09:24:16 +0000">
    koon
  </metadata>
  <metadata tag="submitter" timestamp="Mon, 10 Jan 2005 10:01:20 +0000">
    vorlon078
  </metadata>
  <metadata tag="bugReady" timestamp="Wed, 12 Jan 2005 21:52:22 +0000">
    koon
  </metadata>
</glsa>