CVE-2024-31453 is a medium-severity (CVSS 6.5) Unrestricted File Upload vulnerability in psitransfer. A fix is available for psitransfer — see the affected versions and patch details below.
PsiTransfer vulnerable to violation of the integrity of file distribution
Exploitation Status
Proof-of-concept exploit code exists
- CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.
Exploitation and automatability from CISA’s SSVC triage for CVE-2024-31453.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.
psitransfernpmDescription
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
-
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"> -
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"> -
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"> -
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.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | psitransfer | all versions | 2.2.0npm install psitransfer@2.2.0 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for psitransfer, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update psitransfer to 2.2.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2024-31453 is resolved across your whole dependency graph.
Workarounds
Treat uploaded files as untrusted until proven otherwise: validate the actual content type rather than the supplied extension, store uploads outside the web root on a volume mounted without execute permission, and rename them to server-generated identifiers so an attacker cannot choose the path a request will later resolve.
Frequently Asked Questions
Is CVE-2024-31453 in your dependencies?
Find it across npm, including transitive dependencies.