GLSA 200507-11: MIT Kerberos 5: Multiple vulnerabilities
Posted on: 07/13/2005 05:23 AM

A MIT Kerberos 5 security update has been released for Gentoo Linux

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

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Package / Vulnerable / Unaffected
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1 app-crypt/mit-krb5 lt; 1.4.1-r1 gt;= 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 "gt;=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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