Claroline Cross-site Scripting

Claroline 13.5.7 and prior allows an authenticated attacker to elevate privileges via the arbitrary creation of a privileged user. By combining the XSS vulnerability present in several upload forms and a javascript request to the present API, it is possible to trigger the creation of a user with administrative rights by opening an SVG file as an administrator user. (2022-08-25, CVE-2022-37160)

Claroline 13.5.7 and prior is vulnerable to Cross Site Scripting (XSS) via SVG file upload. (2022-08-25, CVE-2022-37161)

Claroline 13.5.7 and prior is vulnerable to Cross Site Scripting (XSS). An attacker can obtain javascript code execution by adding arbitrary javascript code in the 'Location' field of a calendar event. (2022-08-25, CVE-2022-37162)

Cross site scripting is an attack where a web page executes code that is injected by an adversary. It usually appears, when users input is presented. This attack can be used to impersonate a user, take over control of the session, or even steal API keys.

The attack can be executed e.g. when you application injects the request parameter directly into the HTML code of the page returned to the user:

https://server.com/confirmation?message=Transaction+Complete

what results in:

<span>Confirmation: Transaction Complete</span>

In that case the message can be modified to become a valid Javascript code, e.g.:

https://server.com/confirmation?message=<script>dangerous javascript code here</script>

and it will be executed locally by the user's browser with full access to the user's personal application/browser data:

<span>Confirmation: <script>dangerous javascript code here</script></span>