CVE-2025-44823
📋 TL;DR
Nagios Log Server before version 2024R1.3.2 allows authenticated users to retrieve cleartext administrative API keys via a specific API endpoint. This vulnerability affects all Nagios Log Server installations running vulnerable versions. Attackers with authenticated access can obtain sensitive credentials that could lead to full system compromise.
💻 Affected Systems
- Nagios Log Server
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers obtain administrative API keys, gain full control over Nagios Log Server, access all monitored logs and systems, and potentially pivot to other infrastructure.
Likely Case
Authenticated attackers or compromised accounts retrieve API keys, leading to unauthorized access, data exfiltration, and privilege escalation within the monitoring system.
If Mitigated
With proper access controls and network segmentation, impact is limited to the Nagios Log Server instance itself.
🎯 Exploit Status
Exploit requires authenticated access but is trivial to execute via simple HTTP GET request.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2024R1.3.2
Vendor Advisory: https://www.nagios.com/changelog/#log-server
Restart Required: Yes
Instructions:
1. Backup current configuration. 2. Download Nagios Log Server 2024R1.3.2 or later. 3. Follow Nagios upgrade documentation. 4. Restart Nagios Log Server services.
🔧 Temporary Workarounds
Restrict API Access
linuxBlock access to the vulnerable API endpoint using web server or firewall rules
# For Apache: RewriteRule ^/nagioslogserver/index.php/api/system/get_users - [F]
# For Nginx: location ~ /nagioslogserver/index.php/api/system/get_users { deny all; }
Network Segmentation
linuxRestrict network access to Nagios Log Server API endpoints
# Example iptables rule: iptables -A INPUT -p tcp --dport 80 -m string --string "/nagioslogserver/index.php/api/system/get_users" --algo bm -j DROP
🧯 If You Can't Patch
- Implement strict access controls and limit authenticated users to minimum necessary privileges
- Monitor API access logs for suspicious requests to the vulnerable endpoint
🔍 How to Verify
Check if Vulnerable:
Check Nagios Log Server version via web interface or command: grep 'version' /usr/local/nagioslogserver/var/nagios.logCheck Version:
grep 'version' /usr/local/nagioslogserver/var/nagios.log || cat /usr/local/nagioslogserver/var/version.txtVerify Fix Applied:
Verify version is 2024R1.3.2 or later and test that API endpoint no longer returns cleartext API keys📡 Detection & Monitoring
Log Indicators:
- HTTP GET requests to /nagioslogserver/index.php/api/system/get_users
- Unusual API key usage patterns
- Multiple failed authentication attempts followed by API access
Network Indicators:
- Traffic to vulnerable endpoint from unexpected sources
- Outbound connections using administrative API keys
SIEM Query:
source="*nagios*" AND (uri_path="/nagioslogserver/index.php/api/system/get_users" OR message="*get_users*")