WordPress Plugin SendIt 1.5.9 - Blind SQL Injection

# Exploit Title: WordPress SendIt plugin <= 1.5.9 Blind SQL Injection Vulnerability
# Google Dork: inurl:"wp-content/plugins/sendit/submit.php"
# Date: 2011-08-25
# Author: evilsocket ( evilsocket [at] gmail [dot] com )
# Software Link: http://wordpress.org/extend/plugins/sendit/
# Version: 1.5.9 (tested with magic quotes OFF)


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Vulnerable code
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[ submit.php line 27 ]

$user_count = $wpdb->get_var("SELECT COUNT(*) FROM $table_email where email ='$_POST[email_add]' and id_lista = '$_POST[lista]';");


As you can see, $_POST[lista] parameter is nor validated neither escaped, so you can blind sql inject it using $user_count for the 
boolean condition checking :


[ submit.php line 29 ]

if($user_count>0) :
  $errore_presente = "<div class=\"error\">".__('email address already present', 'sendit')."</div>";
  die($errore_presente);

---
PoC
---

POST:

email_add = [email protected]
lista = BLIND SQL INJECTION HERE

TO:

http://www.site.com/wp-content/plugins/sendit/submit.php