CVE-2021-28925
📋 TL;DR
This SQL injection vulnerability in Nagios Network Analyzer allows attackers to execute arbitrary SQL commands via the o[col] parameter in the api/checks/read/ endpoint. This affects all Nagios Network Analyzer installations before version 2.4.3, potentially leading to data theft, manipulation, or complete system compromise.
💻 Affected Systems
- Nagios Network Analyzer
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise leading to data exfiltration, privilege escalation, and potential remote code execution on the underlying server.
Likely Case
Unauthorized access to sensitive network monitoring data, configuration information, and potential lateral movement within the network.
If Mitigated
Limited impact with proper input validation and database permissions, potentially only allowing data viewing without modification.
🎯 Exploit Status
The vulnerability requires no authentication and has publicly available proof-of-concept code, making exploitation straightforward.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.4.3
Vendor Advisory: https://www.nagios.com/downloads/nagios-network-analyzer/change-log/
Restart Required: Yes
Instructions:
1. Download Nagios Network Analyzer 2.4.3 or later from the official Nagios website. 2. Follow the upgrade instructions in the documentation. 3. Restart the Nagios Network Analyzer service. 4. Verify the upgrade was successful.
🔧 Temporary Workarounds
Input Validation Filter
allImplement input validation to sanitize the o[col] parameter before processing
# Requires modifying the application code to validate/sanitize the o[col] parameter
Web Application Firewall Rules
allDeploy WAF rules to block SQL injection patterns in the o[col] parameter
# WAF-specific configuration to block SQL injection patterns in the o[col] parameter
🧯 If You Can't Patch
- Implement network segmentation to restrict access to Nagios Network Analyzer to authorized users only
- Deploy a web application firewall with SQL injection detection rules specifically for the o[col] parameter
🔍 How to Verify
Check if Vulnerable:
Check the Nagios Network Analyzer version via the web interface or by examining the installation directory. Versions before 2.4.3 are vulnerable.Check Version:
Check the web interface or examine the application files for version information. On Linux: grep -r 'version' /usr/local/nagiosna/ or similar installation directory.Verify Fix Applied:
Verify the version is 2.4.3 or later and test the api/checks/read/ endpoint with SQL injection payloads to confirm they are blocked.📡 Detection & Monitoring
Log Indicators:
- Unusual SQL queries in database logs
- Multiple failed login attempts followed by SQL error messages
- Requests to api/checks/read/ with unusual o[col] parameter values
Network Indicators:
- HTTP requests containing SQL keywords (SELECT, UNION, etc.) in the o[col] parameter
- Unusual traffic patterns to the Nagios Network Analyzer API endpoint
SIEM Query:
source="web_logs" AND uri="/api/checks/read/" AND (param="o[col]" AND value CONTAINS "SELECT" OR value CONTAINS "UNION" OR value CONTAINS "OR 1=1")🔗 References
- https://medium.com/stolabs/issues-found-on-nagios-network-analyzer-2-4-2-50ec4ffb5e25
- https://www.nagios.com/downloads/nagios-network-analyzer/change-log/
- https://medium.com/stolabs/issues-found-on-nagios-network-analyzer-2-4-2-50ec4ffb5e25
- https://www.nagios.com/downloads/nagios-network-analyzer/change-log/
