CVE-2024-52043
📋 TL;DR
This vulnerability in HumHub allows attackers to enumerate valid usernames through error messages that leak sensitive information. All HumHub installations through version 1.16.2 are affected, potentially exposing user accounts to targeted attacks.
💻 Affected Systems
- HumHub GmbH & Co. KG - HumHub
📦 What is this software?
Humhub by Humhub
⚠️ Risk & Real-World Impact
Worst Case
Complete user enumeration leading to targeted credential stuffing attacks, account takeovers, and subsequent lateral movement within the platform.
Likely Case
Attackers identify valid usernames for targeted phishing, brute-force attacks, or social engineering campaigns.
If Mitigated
Limited information disclosure with no direct access to user data or system compromise.
🎯 Exploit Status
User enumeration via error messages typically requires minimal technical skill and can be automated.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.16.3 or later
Vendor Advisory: https://github.com/advisories/GHSA-3q4w-rf2j-fx5x
Restart Required: No
Instructions:
1. Backup your HumHub installation. 2. Update to HumHub version 1.16.3 or later via the admin panel or manual upgrade. 3. Verify the update completed successfully.
🔧 Temporary Workarounds
Error Message Sanitization
linuxModify error handling to suppress sensitive information in error responses
# Requires code modification - consult HumHub documentation for error handling configuration
🧯 If You Can't Patch
- Implement rate limiting on authentication endpoints to slow enumeration attempts
- Deploy a WAF with rules to detect and block user enumeration patterns
🔍 How to Verify
Check if Vulnerable:
Check if your HumHub version is 1.16.2 or earlier via the admin dashboard or version fileCheck Version:
grep "version" /path/to/humhub/protected/config/version.phpVerify Fix Applied:
Confirm version is 1.16.3 or later and test that error messages no longer reveal user existence information📡 Detection & Monitoring
Log Indicators:
- Multiple failed login attempts with different usernames
- Unusual pattern of authentication errors
Network Indicators:
- High volume of requests to authentication endpoints
- Patterns suggesting automated username testing
SIEM Query:
source="humhub_logs" AND (event="login_failed" OR event="authentication_error") | stats count by src_ip, username | where count > threshold