CVE-2024-39687 Fedify vulnerable to allowing access to internal network resources
An attacker can exploit Fedify to send requests to internal network resources via crafted ActivityPub URLs, potentially accessing sensitive internal data.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-39687?
CVE-2024-39687 is a high-severity server-side request forgery vulnerability in dahlia fedify, published on 5 Jul 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Fedify is a TypeScript library for building federated server apps powered by ActivityPub and other standards. At present, when Fedify needs to retrieve an object or activity from a remote activitypub server, it makes a HTTP request to the `@id` or other resources present within the activity it has received from the web. This activity could reference an `@id` that points to an internal IP address, allowing an attacker to send request to resources internal to the fedify server's network. This applies to not just resolution of documents containing activities or objects, but also to media URLs as well. Specifically this is a Server Side Request Forgery attack. Users should upgrade to Fedify version 0.9.2, 0.10.1, or 0.11.1 to receive a patch for this issue.
Weakness: CWE-918
Which versions are affected by CVE-2024-39687?
6 open source packages ship an affected version, including @fedify/fedify.
| Package | Affected | Fixed in |
|---|---|---|
@fedify/fedify npm | All versions | 0.9.2 |
@fedify/fedify npm | All versions | 0.9.2 |
@fedify/fedify npm | From 0.10.0 | 0.10.2 |
@fedify/fedify npm | From 0.10.0 | 0.10.2 |
@fedify/fedify npm | From 0.11.0 | 0.11.2 |
@fedify/fedify npm | From 0.11.0 | 0.11.2 |
How do I fix CVE-2024-39687?
Upgrade @fedify/fedify to a fixed version for your release line: 0.9.2, 0.10.2 or 0.11.2.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2024-39687 being exploited?
There is no known exploitation of CVE-2024-39687 in the wild and no public exploit code.
Sources
Also known as GHSA-p9cg-vqcc-grcx.