CVE-2024-39687: SSRF (CVSS 7.2)

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.

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CVSS v3.1 Score

7.2

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:L

Weakness Type (CWE)

CWE-918 Server-Side Request Forgery (SSRF)

References

Other References

https://github.com/dahlia/fedify/commit/30f9cf4a175704a04c874f3ea88414c5f1e00b28 https://github.com/dahlia/fedify/commit/c641e976089dd913f649889c1bfb016df04e86ba https://github.com/dahlia/fedify/security/advisories/GHSA-p9cg-vqcc-grcx https://github.com/dahlia/fedify/commit/30f9cf4a175704a04c874f3ea88414c5f1e00b28 https://github.com/dahlia/fedify/commit/c641e976089dd913f649889c1bfb016df04e86ba https://github.com/dahlia/fedify/security/advisories/GHSA-p9cg-vqcc-grcx

Frequently Asked Questions

What is CVE-2024-39687? +

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. It has a CVSS v3.1 base score of 7.2 (HIGH).

How severe is CVE-2024-39687? +

CVE-2024-39687 has a CVSS v3.1 score of 7.2 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

How do I check if I'm vulnerable to CVE-2024-39687? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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