CVE-2024-32983: misskey Auth Bypass — Exploit & Fix

Description

Misskey is an open source, decentralized microblogging platform. Misskey doesn't perform proper normalization on the JSON structures of incoming signed ActivityPub activity objects before processing them, allowing threat actors to spoof the contents of signed activities and impersonate the authors of the original activities. This vulnerability is fixed in 2024.5.0.

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CVSS v3.1 Score

8.2

HIGH

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

Weakness Type (CWE)

CWE-863 Incorrect Authorization

Affected Products

Vendor	Product	Versions
misskey	misskey	< 2024.5.0

References

Advisories & Patches

https://github.com/misskey-dev/misskey/commit/d2a5bb39e344fcb84a24ae60faafe4694b227b88 https://github.com/misskey-dev/misskey/security/advisories/GHSA-2vxv-pv3m-3wvj https://github.com/misskey-dev/misskey/commit/d2a5bb39e344fcb84a24ae60faafe4694b227b88 https://github.com/misskey-dev/misskey/security/advisories/GHSA-2vxv-pv3m-3wvj

Exploits

https://github.com/misskey-dev/misskey/security/advisories/GHSA-2vxv-pv3m-3wvj https://github.com/misskey-dev/misskey/security/advisories/GHSA-2vxv-pv3m-3wvj

Frequently Asked Questions

What is CVE-2024-32983? +

Misskey is an open source, decentralized microblogging platform. Misskey doesn't perform proper normalization on the JSON structures of incoming signed ActivityPub activity objects before processing them, allowing threat actors to spoof the contents of signed activities and impersonate the authors of the original activities. This vulnerability is fixed in 2024.5.0. It has a CVSS v3.1 base score of 8.2 (HIGH).

How severe is CVE-2024-32983? +

CVE-2024-32983 has a CVSS v3.1 score of 8.2 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2024-32983? +

CVE-2024-32983 affects products from misskey, specifically: misskey. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-32983? +

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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