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TUCoPS :: Linux :: Apps A-M :: b06-4044.htm

LibVNCServer: Authentication bypass



LibVNCServer: Authentication bypass
LibVNCServer: Authentication bypass



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Gentoo Linux Security Advisory                           GLSA 200608-05
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http://security.gentoo.org/ 
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  Severity: High
     Title: LibVNCServer: Authentication bypass
      Date: August 04, 2006
      Bugs: #136916
        ID: 200608-05

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Synopsis
=======
VNC servers created with LibVNCServer accept insecure protocol types,
even when the server does not offer it, resulting in unauthorized
access to the server.

Background
=========
LibVNCServer is a GPL'ed library for creating VNC servers.

Affected packages
================
    -------------------------------------------------------------------
     Package                /  Vulnerable  /                Unaffected
    -------------------------------------------------------------------
  1  net-libs/libvncserver       < 0.8.2                      >= 0.8.2

Description
==========
LibVNCServer fails to properly validate protocol types effectively
letting users decide what protocol to use, such as "Type 1 - None".
LibVNCServer will accept this security type, even if it is not offered
by the server.

Impact
=====
An attacker could use 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 LibVNCServer users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-libs/libvncserver-0.8.2"

References
=========
  [ 1 ] CVE-2006-2450
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-2450 

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

http://security.gentoo.org/glsa/glsa-200608-05.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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