glsa-200405-07.xml


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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="200405-07">
  <title>Exim verify=header_syntax buffer overflow</title>
  <synopsis>
    When the verify=header_syntax option is set, there is a buffer overflow in
    Exim that allows remote execution of arbitrary code.
  </synopsis>
  <product type="ebuild">Exim</product>
  <announced>2004-05-14</announced>
  <revised count="01">2004-05-14</revised>
  <bug>50217</bug>
  <access>remote </access>
  <affected>
    <package name="mail-mta/exim" auto="yes" arch="*">
      <unaffected range="ge">4.33-r1</unaffected>
      <vulnerable range="le">4.33</vulnerable>
    </package>
  </affected>
  <background>
    <p>
    Exim is an highly configurable message transfer agent (MTA) developed at
    the University of Cambridge.
    </p>
  </background>
  <description>
    <p>
    When the option "verify = header_syntax" is used in an ACL in the
    configuration file, Exim is vulnerable to a buffer overflow attack that can
    be triggered remotely by sending malicious headers in an email message.
    Note that this option is not enabled in Exim's default configuration file.
    </p>
  </description>
  <impact type="high">
    <p>
    This vulnerability can be exploited to trigger a denial of service attack
    and potentially execute arbitrary code with the rights of the user used by
    the Exim daemon (by default this is the "mail" user in Gentoo Linux).
    </p>
  </impact>
  <workaround>
    <p>
    Make sure the verify=header_syntax option is not used in your exim.conf
    file.
    </p>
  </workaround>
  <resolution>
    <p>
    All users of Exim should upgrade to the latest stable version:
    </p>
    <code>
    # emerge sync

    # emerge -pv "&gt;=mail-mta/exim-4.33-r1"
    # emerge "&gt;=mail-mta/exim-4.33-r1"</code>
  </resolution>
  <references>
    <uri link="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0400">CAN-2004-0400</uri>
  </references>
  <metadata tag="submitter">
    koon
  </metadata>
</glsa>