Moodle 4.3.3 Chat Activity cross site scripting ⚔ [Disputed]

Summaryinfo

A vulnerability categorized as problematic has been discovered in Moodle 4.3.3. This issue affects some unknown processing of the component Chat Activity. Executing a manipulation can lead to cross site scripting. The identification of this vulnerability is CVE-2024-28593. The attack may be launched remotely. There is no exploit available. The actual existence of this vulnerability is currently in question.

Detailsinfo

A vulnerability classified as problematic was found in Moodle 4.3.3. This vulnerability affects an unknown functionality of the component Chat Activity. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. CVE summarizes:

The Chat activity in Moodle 4.3.3 allows students to insert a potentially unwanted HTML A element or IMG element, or HTML content that leads to a performance degradation. NOTE: the vendor's Using_Chat page says "If you know some HTML code, you can use it in your text to do things like insert images, play sounds or create different coloured and sized text." This page also says "Chat is due to be removed from standard Moodle."

The advisory is available at docs.moodle.org. This vulnerability was named CVE-2024-28593 since 03/08/2024. The exploitation appears to be easy. The attack can be initiated remotely. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 11/05/2024). This vulnerability is assigned to T1059.007 by the MITRE ATT&CK project.

The real existence of this vulnerability is still doubted at the moment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Learning Management Software

Name

• Moodle

Version

• 4.3.3

License

• open-source

Website

• Product: https://moodle.org/

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