CVE-2020-36869
📋 TL;DR
Nagios XI versions before 5.7.5 contain a SQL injection vulnerability in the SNMP Trap Interface edit page. This allows authenticated administrators to execute arbitrary SQL commands against the database, potentially leading to data theft, modification, or system compromise. Only users with administrative privileges can exploit this vulnerability.
💻 Affected Systems
- Nagios XI
📦 What is this software?
Nagios Xi by Nagios
⚠️ Risk & Real-World Impact
Worst Case
Administrator account compromise leading to full database takeover, data exfiltration, privilege escalation to operating system, or complete system compromise.
Likely Case
Malicious administrator or compromised admin account uses SQL injection to access sensitive monitoring data, modify configurations, or disrupt monitoring operations.
If Mitigated
Limited impact due to proper access controls, monitoring, and least privilege principles restricting administrative access.
🎯 Exploit Status
Exploitation requires administrative credentials. SQL injection is straightforward once authenticated to the vulnerable interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 5.7.5 and later
Vendor Advisory: https://www.nagios.com/changelog/nagios-xi/
Restart Required: No
Instructions:
1. Backup current configuration and database. 2. Download Nagios XI 5.7.5 or later from Nagios website. 3. Follow official upgrade instructions at https://assets.nagios.com/downloads/nagiosxi/docs/Upgrading-Nagios-XI.pdf. 4. Verify upgrade completed successfully.
🔧 Temporary Workarounds
Restrict Administrative Access
allLimit administrative account access to only trusted users and implement strong authentication controls.
Network Segmentation
allIsolate Nagios XI management interface from untrusted networks and implement strict firewall rules.
🧯 If You Can't Patch
- Implement strict access controls and monitor all administrative activity on Nagios XI
- Deploy web application firewall (WAF) with SQL injection protection rules
🔍 How to Verify
Check if Vulnerable:
Check Nagios XI version via web interface (Help > About) or command line: cat /usr/local/nagiosxi/var/xiversionCheck Version:
cat /usr/local/nagiosxi/var/xiversionVerify Fix Applied:
Confirm version is 5.7.5 or higher using same methods. Test SNMP Trap Interface edit page functionality.📡 Detection & Monitoring
Log Indicators:
- Unusual SQL queries in database logs
- Multiple failed login attempts followed by successful admin login
- Unexpected modifications to SNMP trap configurations
Network Indicators:
- Unusual database connections from Nagios XI server
- Suspicious HTTP POST requests to /nagiosxi/admin/snmptrap.php
SIEM Query:
source="nagios" AND (uri="/nagiosxi/admin/snmptrap.php" OR sql_query="*SELECT*" OR sql_query="*UNION*")