Executive Summary

This vulnerability affects Concrete CMS version 9.5.0 and below. It is an Insecure Direct Object Reference (IDOR) issue in the '/ccm/frontend/conversations/get_rating' endpoint. This endpoint can be exploited to confirm the existence of any message by its ID and retrieve its rating score without proper authorization.

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Impact Analysis

An attacker can use this vulnerability to access information about messages that they should not be able to see, specifically confirming message existence and viewing rating scores. This could lead to unauthorized disclosure of information and potential privacy issues.

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Detection Guidance

This vulnerability involves the '/ccm/frontend/conversations/get_rating' endpoint confirming the existence and returning the rating score for any message by ID.

To detect this vulnerability on your system or network, you can attempt to access this endpoint with different message IDs and observe if the system returns rating scores without proper authorization.

For example, you might use a command like the following to test the endpoint:

• curl -i -X GET "http://[target]/ccm/frontend/conversations/get_rating?message_id=[ID]"

Replace [target] with your Concrete CMS server address and [ID] with various message IDs to check if the endpoint returns rating information without authentication.

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Mitigation Strategies

The CVE description does not provide specific mitigation steps.

However, general immediate mitigation steps for an IDOR vulnerability like this include:

• Restrict access to the '/ccm/frontend/conversations/get_rating' endpoint to authenticated and authorized users only.
• Implement proper access control checks on the server side to ensure users can only access ratings for messages they are permitted to view.
• Consider updating Concrete CMS to a version where this vulnerability is fixed once available.

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