Authentication

Testing credentials

VNC servers may support password authentication, though this is uncommon. Currently, NetExec does not support username auth and will omit any value provided to --username/-u.

nxc vnc <ip> -u '' -p <password>

Expected Results:

nxc vnc 192.168.56.22 -u '' -p 'badpassword'
VNC         192.168.56.22   5900   192.168.56.22    [*] RFB 3.8
VNC         192.168.56.22   5900   192.168.56.22    [+] badpassword

Unauthenticated access

When the VNC server doesn't require authentication, the following output can be expected.

nxc vnc 192.168.56.22
VNC         192.168.56.22   5900   192.168.56.22    [*] RFB 3.8 (No Auth:True)

Specify port

nxc vnc 192.168.56.22 --port 5901
VNC         192.168.56.22   5901   192.168.56.22    [*] RFB 3.8 (No Auth:True)

VNC sleep

Increase the VNC socket connection sleep interval to prevent rate limiting.

nxc vnc <ip> --vnc-sleep <seconds>