full-disclosure - [ GLSA 200409-09 ] MIT krb5: Multiple vulnerabilities

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Message-ID: <413C225B.5010101@gentoo.org>
From: koon at gentoo.org (Thierry Carrez)
Subject: [ GLSA 200409-09 ] MIT krb5: Multiple vulnerabilities

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Gentoo Linux Security Advisory                           GLSA 200409-09
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                                            http://security.gentoo.org/
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  Severity: High
     Title: MIT krb5: Multiple vulnerabilities
      Date: September 06, 2004
      Bugs: #62417
        ID: 200409-09

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Synopsis
========

MIT krb5 contains several double-free vulnerabilities, potentially
allowing the execution of arbitrary code, as well as a denial of
service vulnerability.

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       < 1.3.4                         >= 1.3.4

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

The implementation of the Key Distribution Center (KDC) and the MIT
krb5 library contain double-free vulnerabilities, making client
programs as well as application servers vulnerable.

The ASN.1 decoder library is vulnerable to a denial of service attack,
including the KDC.

Impact
======

The double-free vulnerabilities could allow an attacker to execute
arbitrary code on a KDC host and hosts running krb524d or vulnerable
services. In the case of a KDC host, this can lead to a compromise of
the entire Kerberos realm. Furthermore, an attacker impersonating a
legitimate KDC or application server can potentially execute arbitrary
code on authenticating clients.

An attacker can cause a denial of service for a KDC or application
server and clients, the latter if impersonating a legitimate KDC or
application server.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All mit-krb5 users should upgrade to the latest stable version:

    # emerge sync

    # emerge -pv ">=app-crypt/mit-krb5-1.3.4"
    # emerge ">=app-crypt/mit-krb5-1.3.4"

References
==========

  [ 1 ] MIT krb5 Security Advisory 2004-002

http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2004-002-dblfree.txt
  [ 2 ] MIT krb5 Security Advisory 2004-003

http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2004-003-asn1.txt
  [ 3 ] CAN-2004-0642
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0642
  [ 4 ] CAN-2004-0643
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0643
  [ 5 ] CAN-2004-0644
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0644
  [ 6 ] CAN-2004-0772
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0772

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

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

  http://security.gentoo.org/glsa/glsa-200409-09.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@...too.org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2004 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/1.0

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