VNC Security Type Enforcement Failure Remote Authentication Bypass

This script is Copyright (C) 2006-2013 Tenable Network Security, Inc.


Synopsis :

The remote VNC server is prone to an authentication bypass issue.

Description :

The VNC server installed on the remote host allows an attacker
to bypass authentication by simply requesting 'Type 1 - None' as the
authentication type even though it is not explicitly configured to
support that.

See also :

http://www.nessus.org/u?ef2b8a64
http://lists.grok.org.uk/pipermail/full-disclosure/2006-May/046039.html
http://www.realvnc.com/products/free/4.1/release-notes.html
http://www.realvnc.com/products/personal/4.2/release-notes.html
http://www.realvnc.com/products/enterprise/4.2/release-notes.html
http://www.nessus.org/u?b71e7987

Solution :

If using RealVNC, upgrade to RealVNC Free Edition 4.1.2 / Personal Edition 4.2.3 /
Enterprise Edition 4.2.3 or later.

If using LibVNCServer, upgrade to version 0.8.2 or later.

Risk factor :

High / CVSS Base Score : 7.5
(CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P)
CVSS Temporal Score : 5.9
(CVSS2#E:POC/RL:OF/RC:C)
Public Exploit Available : true

Family: Misc.

Nessus Plugin ID: 21564 ()

Bugtraq ID: 17978
18977

CVE ID: CVE-2006-2369
CVE-2006-2450