GLSA 200504-01: telnet-bsd: Multiple buffer overflows
Posted on: 04/01/2005 04:58 AM

A telnet-bsd security update is available for Gentoo Linux

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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
================

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Package / Vulnerable / Unaffected
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1 net-misc/telnet-bsd lt; 1.0-r1 gt;= 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 "gt;=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=221type=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=220type=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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