bugtraq - [ GLSA 200504-04 ] mit-krb5: Multiple buffer overflows in telnet client

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Date: Wed, 06 Apr 2005 13:50:44 +0200
From: Thierry Carrez <koon@...too.org>
To: gentoo-announce@...in.gentoo.org
Cc: full-disclosure@...ts.grok.org.uk, bugtraq@...urityfocus.com,
	security-alerts@...uxsecurity.com
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
security@...too.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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