[ GLSA 200504-01 ] telnet-bsd: Multiple buffer overflows

[Thierry Carrez <koon () gentoo org>]

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Gentoo Linux Security Advisory                           GLSA 200504-01
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: telnet-bsd: Multiple buffer overflows
      Date: April 01, 2005
      Bugs: #87019
        ID: 200504-01

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Synopsis
========

The telnet-bsd telnet client is vulnerable to two buffer overflows,
which could allow a malicious telnet server operator to execute
arbitrary code.

Background
==========

telnet-bsd provides a command line telnet client which is used for
remote login using the telnet protocol.

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

    -------------------------------------------------------------------
     Package              /  Vulnerable  /                  Unaffected
    -------------------------------------------------------------------
  1  net-misc/telnet-bsd      < 1.0-r1                       >= 1.0-r1

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

A buffer overflow has been identified in the env_opt_add() function of
telnet-bsd, 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 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 telnet-bsd users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-misc/telnet-bsd-1.0-r1"

References
==========

  [ 1 ] CAN-2005-0468
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0468
  [ 2 ] IDEF0867

http://www.idefense.com/application/poi/display?id=221&type=vulnerabilities
  [ 3 ] CAN-2005-0469
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0469
  [ 4 ] IDEF0866

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-200504-01.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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