CVE-2020-36859
📋 TL;DR
This SQL injection vulnerability in Nagios XI's Core Config Manager allows authenticated users to inject malicious SQL queries through object edit pages. Successful exploitation could lead to unauthorized access, data disclosure, or modification of configuration data. Organizations running Nagios XI versions prior to 5.7.4 are affected.
💻 Affected Systems
- Nagios XI
📦 What is this software?
Nagios Xi by Nagios
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the Nagios XI database, leading to disclosure of all monitoring data, configuration secrets, and potential lateral movement to other systems via database connections.
Likely Case
Unauthorized access to sensitive monitoring data, modification of alert configurations to hide security incidents, or extraction of credentials stored in the configuration.
If Mitigated
Limited impact due to proper input validation, database permissions, and network segmentation preventing lateral movement.
🎯 Exploit Status
Exploitation requires authenticated access but SQL injection is straightforward once authenticated.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Nagios XI 5.7.4 or Core Config Manager 3.0.7
Vendor Advisory: https://www.nagios.com/changelog/nagios-xi/
Restart Required: Yes
Instructions:
1. Backup current Nagios XI installation. 2. Download Nagios XI 5.7.4 or later from Nagios website. 3. Follow Nagios XI upgrade documentation. 4. Restart Nagios services after upgrade.
🔧 Temporary Workarounds
Input Validation Web Application Firewall
allDeploy WAF rules to detect and block SQL injection patterns in POST requests to object edit pages.
Restrict Access to Core Config Manager
allLimit access to CCM interface to only necessary administrative users using network ACLs or authentication proxies.
🧯 If You Can't Patch
- Implement strict database permissions limiting CCM application user to only necessary operations
- Deploy network segmentation to isolate Nagios XI database from other critical systems
🔍 How to Verify
Check if Vulnerable:
Check Nagios XI version via Admin > System Config > About page or run: cat /usr/local/nagiosxi/var/xiversionCheck Version:
cat /usr/local/nagiosxi/var/xiversionVerify Fix Applied:
Verify version is 5.7.4 or higher and check that SQL injection attempts are properly sanitized in object edit functionality.📡 Detection & Monitoring
Log Indicators:
- Unusual SQL queries in database logs
- Multiple failed login attempts followed by CCM access
- Unexpected configuration changes in object edit logs
Network Indicators:
- Unusual database connection patterns from Nagios XI server
- SQL error messages in HTTP responses
SIEM Query:
source="nagios_logs" AND ("SQL syntax" OR "unexpected character" OR "object edit")