[ GLSA 200507-11 ] MIT Kerberos 5: Multiple vulnerabilities

[Sune Kloppenborg Jeppesen <jaervosz () gentoo org>]

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Gentoo Linux Security Advisory                           GLSA 200507-11
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                                            http://security.gentoo.org/
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  Severity: High
     Title: MIT Kerberos 5: Multiple vulnerabilities
      Date: July 12, 2005
      Bugs: #98799
        ID: 200507-11

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Synopsis
========

MIT Kerberos 5 is vulnerable to a Denial of Service attack and remote
execution of arbitrary code, possibly leading to the compromise of the
entire Kerberos realm.

Background
==========

MIT Kerberos 5 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     < 1.4.1-r1                     >= 1.4.1-r1

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

Daniel Wachdorf discovered that MIT Kerberos 5 could corrupt the heap
by freeing unallocated memory when receiving a special TCP request
(CAN-2005-1174). He also discovered that the same request could lead to
a single-byte heap overflow (CAN-2005-1175). Magnus Hagander discovered
that krb5_recvauth() function of MIT Kerberos 5 might try to
double-free memory (CAN-2005-1689).

Impact
======

Although exploitation is considered difficult, a remote attacker could
exploit the single-byte heap overflow and the double-free vulnerability
to execute arbitrary code, which could lead to the compromise of the
whole Kerberos realm. A remote attacker could also use the heap
corruption to cause a Denial of Service.

Workaround
==========

There are no known workarounds at this time.

Resolution
==========

All MIT Kerberos 5 users should upgrade to the latest available
version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=app-crypt/mit-krb5-1.4.1-r1"

References
==========

  [ 1 ] CAN-2005-1174
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1174
  [ 2 ] CAN-2005-1175
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1175
  [ 3 ] CAN-2005-1689
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1689
  [ 4 ] MITKRB5-SA-2005-002
        http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2005-002-kdc.txt
  [ 5 ] MITKRB5-SA-2005-003
        http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2005-003-recvauth.txt

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

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

  http://security.gentoo.org/glsa/glsa-200507-11.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 2005 Gentoo Foundation, 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/2.0

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