# 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.
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.