CVE-2024-52591
📋 TL;DR
This vulnerability in Misskey allows attackers to create fake user profiles and forged notes that appear to originate from different instances or users. Attackers can fully control these spoofed objects to impersonate legitimate users and instances. All Misskey instances running affected versions are vulnerable to this identity spoofing attack.
💻 Affected Systems
- Misskey
📦 What is this software?
Misskey by Misskey
Misskey by Misskey
Misskey by Misskey
Misskey by Misskey
⚠️ Risk & Real-World Impact
Worst Case
Attackers could impersonate administrators or trusted users to spread misinformation, manipulate community discussions, conduct social engineering attacks, or damage the reputation of legitimate instances.
Likely Case
Attackers create fake accounts impersonating real users to post misleading content, harass users, or manipulate federated social interactions across instances.
If Mitigated
With proper monitoring and user education, administrators could detect suspicious account behavior, but the fundamental trust in user identities would remain compromised.
🎯 Exploit Status
The vulnerability requires sending specially crafted ActivityPub objects to vulnerable endpoints. No authentication is required to exploit.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2024.11.0-alpha.3
Vendor Advisory: https://github.com/misskey-dev/misskey/security/advisories/GHSA-m2gq-69fp-6hv4
Restart Required: Yes
Instructions:
1. Backup your Misskey instance data. 2. Update Misskey to version 2024.11.0-alpha.3 or later. 3. Restart the Misskey service. 4. Verify the update was successful.
🧯 If You Can't Patch
- Isolate the Misskey instance from the internet if possible
- Implement strict monitoring for unusual account creation or posting patterns
🔍 How to Verify
Check if Vulnerable:
Check your Misskey version. If it's earlier than 2024.11.0-alpha.3, you are vulnerable.Check Version:
Check the Misskey admin panel or run: cat /path/to/misskey/package.json | grep versionVerify Fix Applied:
Verify the version is 2024.11.0-alpha.3 or later and test that the instance properly validates ActivityPub signatures.📡 Detection & Monitoring
Log Indicators:
- Unusual ActivityPub requests to ApRequestService or HttpRequestService endpoints
- Multiple account creations from unexpected instances
- Posts appearing from users that don't exist locally
Network Indicators:
- Incoming ActivityPub objects with mismatched signatures or origins
- Suspicious federation requests
SIEM Query:
source="misskey" AND ("ApRequestService" OR "HttpRequestService") AND ("validation" OR "signature")