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Sicherheit: Pufferüberlauf in telnet-bsd
Aktuelle Meldungen Distributionen
Name: Pufferüberlauf in telnet-bsd
ID: 200504-01
Distribution: Gentoo
Plattformen: Keine Angabe
Datum: Sa, 2. April 2005, 13:00
Referenzen: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-0468
Applikationen: telnet-bsd

Originalnachricht

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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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