CVE-2024-11173
📋 TL;DR
An unhandled exception vulnerability in LibreChat allows attackers to crash the server, causing denial of service. Attackers can exploit this by sending malformed input to specific API endpoints. While authentication is required, open registration enables unauthenticated attackers to create accounts and perform the attack.
💻 Affected Systems
- LibreChat
📦 What is this software?
Librechat by Librechat
⚠️ Risk & Real-World Impact
Worst Case
Complete service disruption making LibreChat unavailable to all users, potentially requiring manual server restart and causing extended downtime.
Likely Case
Service crashes requiring restart, causing temporary unavailability and potential data loss for active sessions.
If Mitigated
Server remains stable with proper input validation and exception handling in place.
🎯 Exploit Status
Exploitation requires creating an account if open registration is enabled, then sending malformed requests to vulnerable endpoints.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.7.6
Vendor Advisory: https://github.com/danny-avila/librechat/commit/95a212534f1c5991bd1231a34ac3668b4b592cc3
Restart Required: Yes
Instructions:
1. Update LibreChat to version 0.7.6 or later. 2. Restart the LibreChat service. 3. Verify the fix by checking the version and testing API endpoints.
🔧 Temporary Workarounds
Disable Open Registration
allPrevents unauthenticated attackers from creating accounts to exploit the vulnerability
Edit LibreChat configuration to disable open registration
Implement Input Validation
allAdd input validation at the web application firewall or reverse proxy level
Configure WAF rules to filter malformed API requests
🧯 If You Can't Patch
- Disable open registration to prevent unauthenticated exploitation
- Implement rate limiting on API endpoints to reduce attack surface
🔍 How to Verify
Check if Vulnerable:
Check if LibreChat version is below 0.7.6 by examining the version file or running the version check commandCheck Version:
Check package.json or version file in LibreChat installation directoryVerify Fix Applied:
Confirm version is 0.7.6 or higher and test API endpoints with malformed input to ensure proper error handling📡 Detection & Monitoring
Log Indicators:
- Unhandled exception errors in server logs
- Server crash/restart events
- Multiple failed API requests with malformed input
Network Indicators:
- Unusual patterns of API requests to vulnerable endpoints
- Sudden drop in service availability
SIEM Query:
source="librechat.log" AND ("unhandled exception" OR "crash" OR "500 error")