GLSA 200504-04: mit-krb5: Multiple buffer overflows in telnet
Posted on: 04/06/2005 08:36 AM

A mit-krb5 security update has been released for Gentoo Linux

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Gentoo Linux Security Advisory GLSA 200504-04
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http://security.gentoo.org/
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Severity: Normal
Title: mit-krb5: Multiple buffer overflows in telnet client
Date: April 06, 2005
Bugs: #87145
ID: 200504-04

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Synopsis
=======

The mit-krb5 telnet client is vulnerable to two buffer overflows, which could allow a malicious telnet server operator to execute arbitrary code.

Background
=========

The MIT Kerberos 5 implementation provides a command line telnet client which is used for remote login via the telnet protocol.

Affected packages
================

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Package / Vulnerable / Unaffected
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1 app-crypt/mit-krb5 lt; 1.3.6-r2 gt;= 1.3.6-r2

Description
==========

A buffer overflow has been identified in the env_opt_add() function, where a response requiring excessive escaping can cause a heap-based buffer overflow. Another issue has been identified in the slc_add_reply() function, where a large number of SLC commands can overflow a fixed size buffer.

Impact
=====

Successful exploitation would require a vulnerable user to connect to an attacker-controlled telnet host, potentially executing arbitrary code with the permissions of the telnet user on the client.

Workaround
=========

There is no known workaround at this time.

Resolution
=========

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

# emerge --sync
# emerge --ask --oneshot --verbose "gt;=app-crypt/mit-krb5-1.3.6-r2"

References
=========

[ 1 ] CAN-2005-0468
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0468
[ 2 ] CAN-2005-0469
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0469
[ 3 ] MITKRB5-SA-2005-001

http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2005-001-telnet.txt

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

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

http://security.gentoo.org/glsa/glsa-200504-04.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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