CVE-2023-43793
📋 TL;DR
This vulnerability allows unauthenticated users to bypass authentication for the Bull dashboard job queue management interface in Misskey by editing URLs. This affects all Misskey instances running versions prior to 2023.9.0. The Bull dashboard provides administrative control over background job processing.
💻 Affected Systems
- Misskey
📦 What is this software?
Misskey by Misskey
⚠️ Risk & Real-World Impact
Worst Case
Attackers could manipulate job queues, delete pending jobs, modify job parameters, or disrupt platform operations, potentially leading to service degradation or data corruption.
Likely Case
Unauthorized users accessing the job queue dashboard to view sensitive job information, monitor system activity, or interfere with scheduled tasks.
If Mitigated
With proper authentication controls, only authorized administrators can access job queue management functions.
🎯 Exploit Status
Exploitation requires only URL manipulation, making it trivial for attackers with basic web knowledge.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2023.9.0
Vendor Advisory: https://github.com/misskey-dev/misskey/security/advisories/GHSA-9fj2-gjcf-cqqc
Restart Required: Yes
Instructions:
1. Backup your Misskey instance. 2. Update to version 2023.9.0 or later using your package manager or git pull. 3. Run database migrations if required. 4. Restart the Misskey service.
🔧 Temporary Workarounds
Disable Bull Dashboard
allCompletely disable the Bull dashboard interface to prevent access.
Edit configuration to set 'enableBullDashboard: false' in your Misskey config
Network Access Control
linuxRestrict access to the Bull dashboard port using firewall rules.
iptables -A INPUT -p tcp --dport [BULL_PORT] -j DROP
ufw deny [BULL_PORT]
🧯 If You Can't Patch
- Implement strict network segmentation to isolate the Bull dashboard from untrusted networks
- Deploy a web application firewall (WAF) with authentication bypass detection rules
🔍 How to Verify
Check if Vulnerable:
Attempt to access /queue or /bull dashboard endpoints without authentication. If accessible, instance is vulnerable.Check Version:
Check package.json or run: node -e "console.log(require('./package.json').version)" in Misskey directoryVerify Fix Applied:
After patching, verify authentication is required for /queue or /bull dashboard endpoints.📡 Detection & Monitoring
Log Indicators:
- Unauthenticated access to /queue/* or /bull/* endpoints
- Failed authentication attempts followed by successful dashboard access
Network Indicators:
- HTTP requests to job queue endpoints without authentication headers
- Unusual traffic patterns to administrative interfaces
SIEM Query:
source="misskey.log" AND (url_path="/queue/*" OR url_path="/bull/*") AND auth_status="unauthenticated" AND response_code=200🔗 References
- https://github.com/misskey-dev/misskey/commit/c9aeccb2ab260ceedc126e6e366da8cd13ece4b2
- https://github.com/misskey-dev/misskey/security/advisories/GHSA-9fj2-gjcf-cqqc
- https://github.com/nexryai/nexkey/security/advisories/GHSA-g8w5-568f-ffwf
- https://github.com/misskey-dev/misskey/commit/c9aeccb2ab260ceedc126e6e366da8cd13ece4b2
- https://github.com/misskey-dev/misskey/security/advisories/GHSA-9fj2-gjcf-cqqc
- https://github.com/nexryai/nexkey/security/advisories/GHSA-g8w5-568f-ffwf
