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

[Thierry Carrez <koon () gentoo org>]

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Gentoo Linux Security Advisory                           GLSA 200503-36
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: netkit-telnetd: Buffer overflow
      Date: March 31, 2005
      Bugs: #87211
        ID: 200503-36

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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

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