CVE-2024-6163
📋 TL;DR
This authentication bypass vulnerability in Checkmk allows remote attackers to access HTTP endpoints without proper credentials, potentially exposing sensitive monitoring data. It affects Checkmk versions before specific patch releases across multiple major versions.
💻 Affected Systems
- Checkmk
📦 What is this software?
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⚠️ Risk & Real-World Impact
Worst Case
Unauthenticated attackers could access all monitoring data, configuration files, and potentially execute administrative functions, leading to complete system compromise.
Likely Case
Attackers access monitoring dashboards, view system metrics, and potentially extract sensitive infrastructure information.
If Mitigated
With proper network segmentation and access controls, impact is limited to unauthorized viewing of monitoring data.
🎯 Exploit Status
The vulnerability allows authentication bypass, making exploitation straightforward once the vulnerable endpoint is identified.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.3.0p10, 2.2.0p31, 2.1.0p46, 2.0.0p40
Vendor Advisory: https://checkmk.com/werk/17011
Restart Required: Yes
Instructions:
1. Backup your Checkmk configuration. 2. Update to the patched version using your distribution's package manager. 3. Restart Checkmk services. 4. Verify the update was successful.
🔧 Temporary Workarounds
Network Access Restriction
linuxRestrict access to Checkmk HTTP endpoints using firewall rules or network segmentation.
iptables -A INPUT -p tcp --dport 80 -s trusted_network -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s trusted_network -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
Reverse Proxy Authentication
allPlace Checkmk behind a reverse proxy with additional authentication layer.
🧯 If You Can't Patch
- Implement strict network access controls to limit Checkmk HTTP endpoint exposure
- Monitor authentication logs for suspicious access patterns and failed login attempts
🔍 How to Verify
Check if Vulnerable:
Check Checkmk version: omd version. If version matches affected range and specific HTTP endpoints are accessible without authentication, system is vulnerable.Check Version:
omd versionVerify Fix Applied:
Verify updated version: omd version. Test previously vulnerable endpoints require authentication.📡 Detection & Monitoring
Log Indicators:
- Unauthenticated access to sensitive endpoints
- HTTP requests to Checkmk endpoints without authentication headers
Network Indicators:
- Unusual traffic patterns to Checkmk HTTP endpoints from unauthorized sources
SIEM Query:
source="checkmk.log" AND (http_status=200 OR http_status=302) AND NOT (user!="" OR auth_success="true")