glsa-200406-21.xml


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

<glsa id="200406-21">
  <title>mit-krb5: Multiple buffer overflows in krb5_aname_to_localname</title>
  <synopsis>
    mit-krb5 contains multiple buffer overflows in the function
    krb5_aname_to_localname(). This could potentially lead to a complete remote
    system compromise.
  </synopsis>
  <product type="ebuild">mit-krb5</product>
  <announced>June 29, 2004</announced>
  <revised>June 29, 2004: 01</revised>
  <bug>52744</bug>
  <access>remote</access>
  <affected>
    <package name="app-crypt/mit-krb5" auto="yes" arch="*">
      <unaffected range="ge">1.3.3-r1</unaffected>
      <vulnerable range="le">1.3.3</vulnerable>
    </package>
  </affected>
  <background>
    <p>
    mit-krb5 is the free implementation of the Kerberos network authentication
    protocol by the Massachusetts Institute of Technology.
    </p>
  </background>
  <description>
    <p>
    The library function krb5_aname_to_localname() contains multiple buffer
    overflows. This is only exploitable if explicit mapping or rules-based
    mapping is enabled. These are not enabled as default.
    </p>
    <p>
    With explicit mapping enabled, an attacker must authenticate using a
    principal name listed in the explicit mapping list.
    </p>
    <p>
    With rules-based mapping enabled, an attacker must first be able to create
    arbitrary principal names either in the local realm Kerberos realm or in a
    remote realm from which the local realm's service are reachable by
    cross-realm authentication.
    </p>
  </description>
  <impact type="high">
    <p>
    An attacker could use these vulnerabilities to execute arbitrary code with
    the permissions of the user running mit-krb5, which could be the root user.
    </p>
  </impact>
  <workaround>
    <p>
    There is no known workaround at this time. All users are encouraged to
    upgrade to the latest available version.
    </p>
  </workaround>
  <resolution>
    <p>
    mit-krb5 users should upgrade to the latest version:
    </p>
    <code>
    # emerge sync

    # emerge -pv ">=app-crypt/mit-krb5-1.3.3-r1"
    # emerge ">=app-crypt/mit-krb5-1.3.3-r1"</code>
  </resolution>
  <references>
    <uri link="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0523">CAN-2004-0523</uri>
    <uri link="http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2004-001-an_to_ln.txt">MIT krb5 Security Advisory</uri>
  </references>
  <metadata tag="submitter">
    jaervosz
  </metadata>
</glsa>