From: Israel Ochoa (israel@telvista.com.mx)
Date: Tue Jan 22 2008 - 14:44:17 EST
>> Is it secure against Man in the middle attack?
No.
It's kind of insecure, that's because with a "man-in-the-middle" attack you can get the hash of the VNC password (i.e. using Cain) and then using a dictionary or brute force attack you can guess the password, that depends if it is complex or not, and take control of that computer.
Using a sniffer and the same attack you can view all data between VNC client and server.
>> Do I need to report this as a CRITICAL/HIGH security issue..
IMHO Yes, you can consider this as a high issue.
If your client still want to use VNC as a remote connection solution, they can use the AES plugin for UltraVNC.
Israel Ochoa
-----Original Message-----
From: listbounce@securityfocus.com [mailto:listbounce@securityfocus.com] On Behalf Of pentestr
Sent: Viernes, 18 de Enero de 2008 12:46 p.m.
To: Pentest Mailinglist
Subject: Ultra VNC-3DES-is it secure
hi hackers,
I am doing a VA/PT for one our client and found one of the servers is
using Ultra VNC. The ports (5800 & 5900) are open to Internet. Is it
secure against Man in the middle attack?
Do I need to report this as a CRITICAL/HIGH security issue..
Thanks & Rgds.
P.T.
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