[ GLSA 200406-21 ] mit-krb5: Multiple buffer overflows in krb5_aname_to_localname

[Kurt Lieber <klieber () gentoo org>]

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Gentoo Linux Security Advisory                           GLSA 200406-21
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                                            http://security.gentoo.org/
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  Severity: High
     Title: mit-krb5: Multiple buffer overflows in
            krb5_aname_to_localname
      Date: June 29, 2004
      Bugs: #52744
        ID: 200406-21

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Synopsis
========

mit-krb5 contains multiple buffer overflows in the function
krb5_aname_to_localname(). This could potentially lead to a complete
remote system compromise.

Background
==========

mit-krb5 is the free implementation of the Kerberos network
authentication protocol by the Massachusetts Institute of Technology.

Affected packages
=================

    -------------------------------------------------------------------
     Package             /   Vulnerable   /                 Unaffected
    -------------------------------------------------------------------
  1  app-crypt/mit-krb5       <= 1.3.3                     >= 1.3.3-r1

Description
===========

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.

With explicit mapping enabled, an attacker must authenticate using a
principal name listed in the explicit mapping list.

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.

Impact
======

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.

Workaround
==========

There is no known workaround at this time. All users are encouraged to
upgrade to the latest available version.

Resolution
==========

mit-krb5 users should upgrade to the latest version:

    # emerge sync

    # emerge -pv ">=app-crypt/mit-krb5-1.3.3-r1"
    # emerge ">=app-crypt/mit-krb5-1.3.3-r1"

References
==========

  [ 1 ] CAN-2004-0523
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0523
  [ 2 ] MIT krb5 Security Advisory
        http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2004-001-an_to_ln.txt

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

     http://security.gentoo.org/glsa/glsa-200406-21.xml

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users machines is of utmost
importance to us. Any security concerns should be addressed to
security () gentoo org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2004 Gentoo Technologies, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/1.0

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