CVE-2024-14003
📋 TL;DR
Nagios XI versions before 2024R1.2 contain a critical remote code execution vulnerability in the NRDP server plugins. Attackers can send specially crafted NRDP requests to execute arbitrary commands on the host system with web/Nagios service privileges. Organizations running vulnerable Nagios XI instances are affected.
💻 Affected Systems
- Nagios XI
📦 What is this software?
Nagios Xi by Nagios
Nagios Xi by Nagios
Nagios Xi by Nagios
Nagios Xi by Nagios
Nagios Xi by Nagios
Nagios Xi by Nagios
Nagios Xi by Nagios
Nagios Xi by Nagios
Nagios Xi by Nagios
Nagios Xi by Nagios
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise allowing attackers to install malware, steal sensitive data, pivot to other systems, or deploy ransomware across the network.
Likely Case
Initial foothold leading to privilege escalation, lateral movement, and deployment of persistence mechanisms within the monitoring infrastructure.
If Mitigated
Contained impact limited to the Nagios service account with no lateral movement due to network segmentation and strict access controls.
🎯 Exploit Status
Exploitation requires network access to the NRDP endpoint but no authentication. Public proof-of-concept code exists.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2024R1.2
Vendor Advisory: https://www.nagios.com/changelog/nagios-xi/
Restart Required: Yes
Instructions:
1. Backup current Nagios XI configuration. 2. Download Nagios XI 2024R1.2 from the Nagios customer portal. 3. Run the upgrade script following Nagios documentation. 4. Verify the upgrade completed successfully.
🔧 Temporary Workarounds
Disable NRDP server plugins
linuxTemporarily disable vulnerable NRDP server plugins to block exploitation vectors
Edit Nagios XI configuration to disable NRDP plugins or block access to NRDP endpoints
Network access restrictions
linuxRestrict network access to Nagios XI NRDP endpoints using firewall rules
iptables -A INPUT -p tcp --dport 5667 -s trusted_ips -j ACCEPT
iptables -A INPUT -p tcp --dport 5667 -j DROP
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Nagios XI from critical systems
- Deploy web application firewall (WAF) rules to block malicious NRDP requests
🔍 How to Verify
Check if Vulnerable:
Check Nagios XI version via web interface Admin > System Config > About or run: grep 'nagios_version' /usr/local/nagiosxi/var/xiversionCheck Version:
grep 'nagios_version' /usr/local/nagiosxi/var/xiversionVerify Fix Applied:
Confirm version is 2024R1.2 or later and test NRDP functionality with legitimate requests📡 Detection & Monitoring
Log Indicators:
- Unusual NRDP requests in /usr/local/nagiosxi/var/log/nrdp.log
- Suspicious command execution in system logs
- Unexpected processes spawned by nagios user
Network Indicators:
- NRDP requests containing shell metacharacters or command injection patterns
- Unusual outbound connections from Nagios server
SIEM Query:
source="nrdp.log" AND ("cmd" OR "exec" OR "system") AND NOT normal_pattern