CVE-2024-38866
📋 TL;DR
CVE-2024-38866 is an input validation vulnerability in Nagvis that allows livestatus injection attacks. Attackers can inject malicious commands into Nagvis's livestatus interface, potentially executing arbitrary code or manipulating monitoring data. This affects all Nagvis installations before version 1.9.47.
💻 Affected Systems
- Nagvis
📦 What is this software?
Nagvis by Nagvis
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution with the privileges of the Nagvis process, potentially leading to complete system compromise, data exfiltration, or lateral movement within the monitoring infrastructure.
Likely Case
Unauthorized access to monitoring data, manipulation of Nagios/Icinga status information, or denial of service affecting monitoring visibility.
If Mitigated
Limited impact with proper input validation and network segmentation, potentially only affecting the Nagvis application's functionality.
🎯 Exploit Status
The vulnerability involves improper input neutralization that could be exploited via crafted HTTP requests to the livestatus endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.9.47
Vendor Advisory: https://www.nagvis.org/downloads/changelog/1.9.47
Restart Required: Yes
Instructions:
1. Backup current Nagvis configuration. 2. Download Nagvis 1.9.47 from the official website. 3. Follow the upgrade instructions in the Nagvis documentation. 4. Restart the web server service (Apache/Nginx). 5. Verify the upgrade was successful.
🔧 Temporary Workarounds
Network Access Restriction
linuxRestrict access to Nagvis's livestatus interface using firewall rules or web server configuration.
# Example iptables rule to restrict access to Nagvis port
# iptables -A INPUT -p tcp --dport [NAGVIS_PORT] -s [TRUSTED_NETWORK] -j ACCEPT
# iptables -A INPUT -p tcp --dport [NAGVIS_PORT] -j DROP
Input Validation Enhancement
allImplement additional input validation at the web application firewall or proxy level.
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Nagvis from untrusted networks.
- Deploy a web application firewall (WAF) with rules to detect and block livestatus injection attempts.
🔍 How to Verify
Check if Vulnerable:
Check the Nagvis version in the web interface or by examining the installation directory. Versions before 1.9.47 are vulnerable.Check Version:
grep '\$version' /usr/local/nagvis/share/nagvis/includes/defines/global.php | head -1Verify Fix Applied:
After upgrading, verify the version shows 1.9.47 or later in the Nagvis web interface or configuration files.📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP requests to /nagvis/frontend/nagvis-js/backend.php or livestatus endpoints
- Suspicious patterns in Nagvis access logs containing injection attempts
Network Indicators:
- Unexpected outbound connections from Nagvis server
- Anomalous traffic patterns to livestatus ports
SIEM Query:
source="nagvis_access.log" AND (uri="/nagvis/frontend/nagvis-js/backend.php" OR uri="*livestatus*") AND (status=500 OR method="POST" AND size>10000)