Advisory

Burak Kelebek, July 2016

Cross-Site Scripting in WordPress Landing Pages Plugin

Abstract

A reflected Cross-Site Scripting (XSS) vulnerability has been found in the WordPress Landing Pages Plugin. By using this vulnerability an attacker can inject malicious JavaScript code into the application, which will execute within the browser of any user who views the Activity Log, in general WP admin.

OVE ID

OVE-20160721-0001

Tested versions

This issue was successfully tested on WordPress Landing Pages version 2.2.4.

Fix

This issue is fixed in WordPress Landing Pages version 2.2.5.

Introduction

WordPress Landing Pages creates landing pages (a.k.a. conversion or splash pages) for your WordPress site. It gives site owners the ability to monitor and track conversion rates, run a/b or multivariate split tests on landing pages, and increase lead flow.

Details

Cross-Site Scripting (XSS) attacks are a type of injection, in which malicious scripts are injected into otherwise benign and trusted web sites. XSS attacks occur when an attacker uses a web application to send malicious code, generally in the form of a browser side script, to a different end user. Flaws that allow these attacks to succeed are quite widespread and occur anywhere a web application uses input from a user within the output it generates without validating or encoding it. Reflected XSS occurs when user input is immediately returned by a web application in an error message, search result, or any other response that includes some or all of the input provided by the user as part of the request

"open-tab" field does not validate <script> tags and does not perform output encoding.

landing-pages/classes/class.settings.php:

177: $active_tab = $_REQUEST['open-tab'];
   
[...]
   
204: echo echo "<form action='edit.php?post_type=landing-page&page=lp_global_settings' method='POST'>    <input type='hidden' name='nature' value='lp-global-settings-save'>    <input type='hidden' name='open-tab' id='id-open-tab' value='{$active_tab}'>";

Proof of concept

http://<target>/wp-admin/edit.php?post_type=landing-page&page=lp_global_settings&open-tab=foobar%5C%27%3E%3Cscript%3Ealert%281%29%3C%2Fscript%3E

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