Difference from vulnerability number GHSA-2p2x-p7wj-j5h2

This vulnerability allows you to violate the integrity of a file bucket and upload new files there. Violation of integrity on the bucket. While the vulnerability with the number GHSA-2p2x-p7wj-j5h2 allows you to violate the integrity of a single file that is uploaded by another user by writing data there and not allows you to upload new files to the bucket. Thus, vulnerabilities are reproduced differently, require different security recommendations and affect different objects of the application’s business logic.

Summary
The absence of restrictions on the endpoint, which allows you to create a path for uploading a file in a file distribution, allows an attacker to add arbitrary files to the distribution.

Details
Vulnerable endpoint: POST /files

PoC

1. Create a file distribution.

2. Go to the link address (id of the file distribution is needed by an attacker to upload files there).

3. Send a POST /files. As the value of the Upload-Metadata header we specify the sid parameter with the id of the file distribution obtained in the second step. In the response from the server in the Location header we get the path for uploading a new file to the file distribution.

5. Send a PATCH /files/{{id}} request with arbitrary content in the request body. Id is taken from the previous step.

Result:

Impact
The vulnerability allows an attacker to influence those users who come to the file distribution after him and slip the victim files with a malicious or phishing signature.