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

[Thierry Carrez <koon () gentoo org>]

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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 () 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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