*XSS and Uncontrolled redirect Vulns in Encrypted Blog Plugin for Wordpress*
# Date: 28 August 2013
# Author: k3170makan
# Vendor or Software Link: http://wordpress.org/plugins/encrypted-blog/
# Version: 0.0.6.2
# Category: webapps
# Tested on: N/A
The Encrypted Blog Plug-in for Wordpress suffers from multiple
vulnerabilities exposing authenticated wordpress users to Cross Site
Scripting attacks and Uncontrolled redirects and via a combination of these
vulnerabilities a leakage of the Encryption key set by the wordpress user.
*Cross Site Scripting:*
The contents of the redirect_to field in the encrypt_blog_form.php, which
is supplied via GET method is not sanitized and allows attackers to submit
malicious HTML/JavaScript and other client side browser scripting content.
Here's the code:
from
https://github.com/marcusds/EncryptedBlog/blob/master/encrypted_blog_form.php
13 <form name="loginform" id="loginform" action="<?php
14 if( isset( $_GET['redirect_to'] ) && !empty( $_GET['redirect_to'] ) )
15 {
16 *echo $_GET['redirect_to'];*
17 if( strpos( $_GET['redirect_to'], '?' ) === false && substr(
$_GET['page'], -1 ) !== '/') {
18 echo '/';
19 }
20 }
21 else
22 {
23 echo './';
24 }
line 16 shows the that the echo is done without parsing the redirect_to
field's value or remove any
potentially malicious HMTL.
PoC: http://imgur.com/S9L4FeV
*Uncontrolled Redirect:*
The uncontrolled redirect stems the following
code:https://github.com/marcusds/EncryptedBlog/blob/master/encrypted_blog_form.php#L43
line 43 shows that unsanitized and uncontrolled data from the redirect_to
field is used to build redirects, meaning that attackers will be able to
redirect victims to arbitrary domains.
PoC: http://imgur.com/LrWmB77
--
<Keith k3170makan <http://about.me/k3170makan> Makan/>
blog.k3170makan.com
