CVE-2024-11172
📋 TL;DR
An unauthenticated denial-of-service vulnerability in librechat allows attackers to crash the server by sending a crafted payload. The vulnerability exists in the checkBan middleware which lacks proper error handling. All users running affected versions of librechat are impacted.
💻 Affected Systems
- danny-avila/librechat
📦 What is this software?
Librechat by Librechat
⚠️ Risk & Real-World Impact
Worst Case
Complete service disruption with server crashes, potentially leading to extended downtime and data loss if persistent storage is affected.
Likely Case
Temporary service interruption requiring manual restart of the librechat service.
If Mitigated
Minimal impact if proper monitoring and automated restart mechanisms are in place.
🎯 Exploit Status
Exploitation requires sending a crafted payload but no authentication is needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.7.6
Vendor Advisory: https://github.com/danny-avila/librechat/commit/976784c01fa4cce00d4c2941801d56aed375c21b
Restart Required: Yes
Instructions:
1. Update librechat to version 0.7.6 or later using your package manager or git. 2. Restart the librechat service. 3. Verify the fix is applied.
🔧 Temporary Workarounds
Add try-catch wrapper
allManually add error handling to the checkBan middleware to prevent crashes
Edit the middleware file to wrap checkBan logic in try-catch block
Implement rate limiting
allAdd rate limiting to prevent repeated exploitation attempts
Configure web server or application rate limiting rules
🧯 If You Can't Patch
- Implement network-level filtering to block suspicious payloads
- Deploy behind a WAF with DoS protection rules
🔍 How to Verify
Check if Vulnerable:
Check if librechat version is below 0.7.6 or if the git commit is a1647d7 or earlierCheck Version:
npm list librechat || check package.json versionVerify Fix Applied:
Confirm version is 0.7.6 or later and test with payload simulation📡 Detection & Monitoring
Log Indicators:
- Server crash logs
- Unhandled exception errors in middleware
- Repeated connection failures
Network Indicators:
- Unusual spike in requests to librechat endpoints
- Pattern of crafted payloads
SIEM Query:
source="librechat" AND ("unhandled exception" OR "crash" OR "middleware error")