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Re: Inconsistent results for VNC

To: rbabcock@cfa.harvard.edu
Subject: Re: Inconsistent results for VNC
From: Michel Arboi <mikhail@nessus.org>
Date: Tue, 14 Nov 2006 17:46:14 +0100
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In-reply-to: <200611141614.kAEGE0mx004120@cfa0.cfa.harvard.edu> (Bob Babcock's message of "Tue, 14 Nov 2006 11:14:00 -0500 (EST)")
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User-agent: Gnus/5.1007 (Gnus v5.10.7) XEmacs/21.4.19 (linux)
On Tue Nov 14 2006 at 17:14, Bob Babcock wrote:

>   The remote VNC server chose security type #0 (Invalid)
>   Any user can connect to it without authentication, and thus take
>   control of this machine.
> and other times get:
[snip]

Try applying this patch (or wait for a while and run
nessus-update-plugins). The script should be more robust.
*** vnc_security_types.nasl     23 May 2006 17:33:55 -0000      1.5
--- vnc_security_types.nasl     14 Nov 2006 16:44:15 -0000
***************
*** 68,74 ****
  if (major == 3 && minor >= 3 && minor < 7)
  {
   r = recv(socket: s, min: 4, length: 4);
!  if (strlen(r) != 4)
   {
    debug_print('Could not read security type\n');
    exit(0);
--- 68,74 ----
  if (major == 3 && minor >= 3 && minor < 7)
  {
   r = recv(socket: s, min: 4, length: 4);
!  if (strlen(r) < 4)
   {
    debug_print('Could not read security type\n');
    exit(0);
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