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GHSA-xg8v-m2mh-45m6

MediumCVSS 6.5 / 10
Published Apr 5, 2024·Last modified Apr 10, 2024
Affected Components(0)

No affected components available

Description

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.

    <img width="1434" alt="Снимок экрана 2024-03-17 в 21 27 30" src="https://github.com/psi-4ward/psitransfer/assets/163760990/4634a6f7-6e7d-486e-9929-76156aaa1340">

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

    <img width="1426" alt="Снимок экрана 2024-03-17 в 21 27 35" src="https://github.com/psi-4ward/psitransfer/assets/163760990/a57c910c-69e2-4b07-985d-b0a46c69891a">

  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.

    <img width="1403" alt="Снимок экрана 2024-03-17 в 21 28 09" src="https://github.com/psi-4ward/psitransfer/assets/163760990/8b839fb8-2c0b-432f-8503-e4c42a840056">

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

    <img width="1067" alt="Снимок экрана 2024-03-17 в 21 28 51" src="https://github.com/psi-4ward/psitransfer/assets/163760990/c5b2acf3-fdf1-4780-8c63-61a7f19338df">

Result: <img width="1432" alt="Снимок экрана 2024-03-17 в 21 29 05" src="https://github.com/psi-4ward/psitransfer/assets/163760990/c49b17c8-e1d2-4894-b6e2-f50b9663fca7"> <img width="1424" alt="Снимок экрана 2024-03-17 в 21 29 15" src="https://github.com/psi-4ward/psitransfer/assets/163760990/e4a1e07d-3e77-4f61-a4e7-ceee4a5a7b8e">

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.

Risk Scores
Base Score
6.5

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. The attacker needs the user to perform some action, like clicking a link. The impact is confined to the system where the vulnerability exists. There is a high impact on the integrity of the data.

Threat Intelligence
6.0

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
0.52%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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