Lateral Movement and Pivoting
SSH Proxy Chaining
SSH Local Port Forwarding
Examples
Local port forwarding allows us to "pull" a port from an SSH server into the SSH client. In our scenario, this could be used to take any service available in our attacker's machine and make it available through a port on PC-1. That way, any host that can't connect directly to the attacker's PC but can connect to PC-1 will now be able to reach the attacker's services through the pivot host.
Using this type of port forwarding would allow us to run reverse shells from hosts that normally wouldn't be able to connect back to us or simply make any service we want available to machines that have no direct connection to us.
Allows us to gain access to the service running on port 10000 from Kali that was only accessible to the victim from their machine.
Kali
SSH Remote Port Forwarding
Examples
SSH Remote Port Forwarding[Bonus] - Port Forwarding
In our example, let's assume that firewall policies block the attacker's machine from directly accessing port 3389 on the server. If the attacker has previously compromised PC-1 and, in turn, PC-1 has access to port 3389 of the server, it can be used to pivot to port 3389 using remote port forwarding from PC-1. Remote port forwarding allows you to take a reachable port from the SSH client (in this case, PC-1) and project it into a remote SSH server (the attacker's machine).
As a result, a port will be opened in the attacker's machine that can be used to connect back to port 3389 in the server through the SSH tunnel. PC-1 will, in turn, proxy the connection so that the server will see all the traffic as if it was coming from PC-1:
Referring to the previous image, to forward port 3389 on the server back to our attacker's machine, we can use the following command on PC-1:
Kali
/etc/ssh/sshd_config
If it's not working, it could because these settings aren't set
Victim
Socat
If there is a website running on port 6666 that can only be seen on the Victims side locally, we can forward it so we can see it on Kali. Below will allows us to see the website on our Kali instance on port 7777
Examples
Port Forwarding & Finding Flag[Bonus] - Port Forwarding
Kali
Victim
sshuttle
Examples
Kali
SSH
Examples
Kali
Victim
copy paste id_rsa.pub from Kali to the Victim server
Kali
proxychains.conf
Kali
I can now see the webpage from Kali but no login credentials to use.
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