From: Sune Kloppenborg Jeppesen <jaervosz@gentoo.org.>
To: gentoo-announce@gentoo.org
Subject: [ GLSA 200608-12 ] x11vnc: Authentication bypass in included LibVNCServer code
Date: Mon, 7 Aug 2006 20:02:22 +0200
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Cc: bugtraq@securityfocus.com, full-disclosure@lists.grok.org.uk,
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Organization: Gentoo Linux Security Team
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Gentoo Linux Security Advisory GLSA 200608-12
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http://security.gentoo.org/
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Severity: High
Title: x11vnc: Authentication bypass in included LibVNCServer code
Date: August 07, 2006
Bugs: #142559
ID: 200608-12
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Synopsis
========
VNC servers created with x11vnc accept insecure protocol types, even
when the server does not offer it, resulting in the possibility of
unauthorized access to the server.
Background
==========
x11vnc provides VNC servers for X displays.
Affected packages
=================
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 x11-misc/x11vnc < 0.8.1 >= 0.8.1
Description
===========
x11vnc 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). x11vnc 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 x11vnc users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=x11-misc/x11vnc-0.8.1"
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-200608-12.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 2006 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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