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Date: Sat, 17 Mar 2012 12:51:07 +0530
From: Dhiru Kholia <>
Subject: Re: VNC Pcap's for cracking

On Wed, Mar 14, 2012 at 10:02 PM, Dhiru Kholia <> wrote:
> I have integrated VNCcrack into JtR. See
> For testing, I used
> TightVNC server 1.3.9 (on Ubuntu 11.04) & TightVNC client 1.3.10 (on
> Windows 7) which use RFB Protocol Version 3.8. Testing and adding
> support for other VNC servers and protocol versions is TODO. For now,
> vncpcap2john.cpp (included in git repository) needs to be compiled
> separately.


According to RFB documents, vnc_format_plug.c can be used to crack all
versions of RFB protocols (3.3, 3.7 and 3.8). They all use same VNC
authentication scheme. I have tested it against 3.7 and 3.8 versions.
However vncpcap2john.cpp is currently limited to cracking TightVNC
generated pcap files. I am working on extending vncpcap2john to
support other servers.


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