Date: Fri, 01 Apr 2005 13:22:48 +0200
From: Thierry Carrez <koon@gentoo.org.>
To: gentoo-announce@robin.gentoo.org
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@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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