[ GLSA 200503-36 ] netkit-telnetd: Buffer overflow

[Thierry Carrez]

This is an OpenPGP/MIME signed message (RFC 2440 and 3156)
--------------enig5AB53435F202A7CF12E5E13A
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Gentoo Linux Security Advisory GLSA 200503-36
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
http://security.gentoo.org/
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Severity: Normal
Title: netkit-telnetd: Buffer overflow
Date: March 31, 2005
Bugs: #87211
ID: 200503-36

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Synopsis
========

The netkit-telnetd telnet client is vulnerable to a buffer overflow,
which could allow a malicious telnet server operator to execute
arbitrary code.

Background
==========

netkit-telnetd provides standard Linux telnet client and server.

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

-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 net-misc/netkit-telnetd < 0.17-r6 >= 0.17-r6

Description
===========

A buffer overflow has been identified in the slc_add_reply() function
of netkit-telnetd client, where a large number of SLC commands can
overflow a fixed size buffer.

Impact
======

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

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All netkit-telnetd users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-misc/netkit-telnetd-0.17-r6"

References
==========

[ 1 ] CAN-2005-0469
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0469
[ 2 ] iDEFENSE Advisory 03-28-05

http://www.idefense.com/application/poi/display?id=220&type=vulnerabilities

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

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

http://security.gentoo.org/glsa/glsa-200503-36.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


--------------enig5AB53435F202A7CF12E5E13A
Content-Type: application/pgp-signature; name="signature.asc"
Content-Description: OpenPGP digital signature
Content-Disposition: attachment; filename="signature.asc"

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.1 (GNU/Linux)

iD8DBQFCS97/vcL1obalX08RAqPTAJ0U96lQ6ItuSV4jrDU16XhgSX4fnwCeJ2 kS
RMB/LUN0B0tNRKR3DBoB0YE=
=0wgI
-----END PGP SIGNATURE-----

--------------enig5AB53435F202A7CF12E5E13A--