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How secure is WinVNC ?

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by net designer

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How secure would it be to run WinVNC server service on PCs behind NAPTed routers?
Could it be hacked from Internet via ports 5800/5900 it runs on?
We do port mapping at router side for internal services (SMTP, HTTP, etc.), and , of course, 5800/5900 are out of the picture, but concern still remains. Share your experience or know-how. Greatly appreciated.
Thx

2 replies

by joseph moore

Yes, I have seen VNC attack programs that run on the standard VNC ports. They do dictionary attacks against VNC. So, to leave a server open on the Internet with the VNC ports open is not a secure-minded thing to do.
What I have seen instead is running VNC in a SSH tunnel; this is more secure. Here is an article on the subject:
http://web.mit.edu/pismere/ssh/vnc-over-ssh.html

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