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

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Message-ID: <424D2F08.20907@gentoo.org>
Date: Fri Apr  1 12:23:30 2005
From: koon at gentoo.org (Thierry Carrez)
Subject: [ GLSA 200504-01 ] telnet-bsd: Multiple buffer
	overflows

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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@...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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