CVE-2024-36113
📋 TL;DR
This vulnerability allows a rogue staff user with administrative privileges in Discourse to suspend other staff users, preventing them from logging into the platform. It affects Discourse installations running vulnerable versions before the patches were released. The issue stems from insufficient access controls that should have prevented staff from suspending other staff members.
💻 Affected Systems
- Discourse
📦 What is this software?
Discourse by Discourse
Discourse by Discourse
Discourse by Discourse
Discourse by Discourse
⚠️ Risk & Real-World Impact
Worst Case
A malicious or compromised staff account could suspend all other staff accounts, effectively locking administrators out of their own Discourse instance and causing complete administrative disruption.
Likely Case
A disgruntled or compromised staff member suspends key administrators, disrupting site management and requiring manual database intervention to restore access.
If Mitigated
With proper staff access controls and monitoring, the impact is limited to temporary administrative disruption that can be quickly identified and resolved.
🎯 Exploit Status
Exploitation requires authenticated access as a staff user. The vulnerability is in the access control logic, making exploitation straightforward for malicious insiders.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Stable: 3.2.3; Beta: 3.3.0.beta3; Tests-passed: 3.3.0.beta4-dev
Vendor Advisory: https://github.com/discourse/discourse/security/advisories/GHSA-3w3f-76p7-3c4g
Restart Required: Yes
Instructions:
1. Backup your Discourse instance and database. 2. Update to the patched version using your deployment method (Docker, manual, etc.). 3. Restart the Discourse application. 4. Verify the update was successful by checking the version.
🧯 If You Can't Patch
- Implement strict access controls and monitoring of staff user activities.
- Reduce the number of staff users to only essential personnel and implement principle of least privilege.
🔍 How to Verify
Check if Vulnerable:
Check your Discourse version. If running stable branch version < 3.2.3, beta branch version < 3.3.0.beta3, or tests-passed branch version < 3.3.0.beta4-dev, you are vulnerable.Check Version:
Check the Discourse admin dashboard or run: `cd /var/discourse && ./launcher status app` (for Docker installations)Verify Fix Applied:
After updating, verify the version matches or exceeds the patched versions. Test that staff users cannot suspend other staff users through the admin interface.📡 Detection & Monitoring
Log Indicators:
- Log entries showing staff user suspension events
- Multiple staff account suspension events in short timeframes
- Failed login attempts from previously active staff accounts
Network Indicators:
- Unusual patterns of admin interface access from staff accounts
SIEM Query:
source="discourse_logs" AND (event="user_suspended" AND user_type="staff") | stats count by src_user🔗 References
- https://github.com/discourse/discourse/commit/8470546f59b04bd82ce9b711406758fd5439936d
- https://github.com/discourse/discourse/commit/9c4a5f39d3ad351410a1453ff5e5f7ffce17cd7e
- https://github.com/discourse/discourse/security/advisories/GHSA-3w3f-76p7-3c4g
- https://github.com/discourse/discourse/commit/8470546f59b04bd82ce9b711406758fd5439936d
- https://github.com/discourse/discourse/commit/9c4a5f39d3ad351410a1453ff5e5f7ffce17cd7e
- https://github.com/discourse/discourse/security/advisories/GHSA-3w3f-76p7-3c4g
