Date: Wed, 06 Apr 2005 13:50:44 +0200
From: Thierry Carrez <koon@gentoo.org.>
To: [email protected]Subject: [ GLSA 200504-04 ] mit-krb5: Multiple buffer overflows in telnet
client
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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
=================
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 app-crypt/mit-krb5 < 1.3.6-r2 >= 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 ">=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
[email protected] 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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