ull-disclosure [ GLSA 200703-19
Posted on: 03/20/2007 12:00 AM

A new security update has been released for Gentoo Linux - [ GLSA 200703-19 . Here the announcement:

Gentoo Linux Security Advisory GLSA 200703-19
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http://security.gentoo.org/
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Severity: High
Title: LTSP: Authentication bypass in included LibVNCServer code
Date: March 18, 2007
Bugs: #142661
ID: 200703-19

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Synopsis
========

LTSP includes a version of libVNCServer that is vulnerable to an
authentication bypass.

Background
==========

The Linux Terminal Server Project adds thin-client support to Linux
servers.

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

-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 net-misc/ltsp lt; 4.2-r1 gt;= 4.2-r1

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

The LTSP server includes vulnerable LibVNCServer code, which fails to
properly validate protocol types effectively letting users decide what
protocol to use, such as "Type 1 - None" (GLSA-200608-05). The LTSP VNC
server will accept this security type, even if it is not offered by the
server.

Impact
======

An attacker could exploit this vulnerability to gain unauthorized
access with the privileges of the user running the VNC server.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All LTSP users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose "gt;=net-misc/ltsp-4.2-r1"

References
==========

[ 1 ] CVE-2006-2450
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-2450
[ 2 ] GLSA 200608-05
http://www.gentoo.org/security/en/glsa/glsa-200608-05.xml

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

http://security.gentoo.org/glsa/glsa-200703-19.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 2007 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/2.5



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