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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@xxxxxxxxxx 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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