GLSA 200409-09: MIT krb5: Multiple vulnerabilities
Posted on: 09/06/2004 05:56 AM

A MIT krb5 security update has been released for Gentoo Linux

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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
================

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Package / Vulnerable / Unaffected
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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@gentoo.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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