CVE-2022-50584
📋 TL;DR
This cross-site scripting (XSS) vulnerability in Nagios XI's Core Config Manager allows attackers to inject malicious scripts into search and deletion interfaces. When exploited, these scripts execute in victims' browsers, potentially stealing session cookies or performing actions as authenticated users. Organizations running Nagios XI versions before 5.8.8 or CCM before 3.1.6 are affected.
💻 Affected Systems
- Nagios XI
- Nagios Core Config Manager (CCM)
📦 What is this software?
Nagios Xi by Nagios
⚠️ Risk & Real-World Impact
Worst Case
Attacker steals administrator session cookies, gains full administrative access to Nagios XI, and potentially compromises the entire monitoring infrastructure or uses it as a pivot point to attack other systems.
Likely Case
Attacker steals user session cookies, gains unauthorized access to monitoring data, modifies configurations, or creates persistent backdoors in the Nagios XI interface.
If Mitigated
With proper input validation and output encoding, the attack fails to execute scripts, though malicious input might still appear in interface elements.
🎯 Exploit Status
Exploitation requires the attacker to trick an authenticated user into interacting with malicious content. The vulnerability is in specific search and deletion interfaces within CCM.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Nagios XI 5.8.8 or CCM 3.1.6
Vendor Advisory: https://www.nagios.com/changelog/nagios-xi/
Restart Required: No
Instructions:
1. Backup your Nagios XI configuration. 2. Update to Nagios XI 5.8.8 or later via the built-in update system (Admin > System Updates). 3. Verify the update completed successfully. 4. If using CCM separately, update to CCM 3.1.6 or later.
🔧 Temporary Workarounds
Input Validation Enhancement
allImplement additional input validation and output encoding for user-supplied data in search and deletion interfaces
Content Security Policy
allImplement strict Content Security Policy headers to prevent script execution from untrusted sources
🧯 If You Can't Patch
- Restrict access to Nagios XI interface to trusted networks only using firewall rules
- Implement web application firewall (WAF) rules to detect and block XSS payloads in search parameters
🔍 How to Verify
Check if Vulnerable:
Check Nagios XI version in Admin > System Status > Version Information. If version is below 5.8.8, the system is vulnerable.Check Version:
cat /usr/local/nagiosxi/var/xiversionVerify Fix Applied:
After updating, verify version shows 5.8.8 or higher in Admin > System Status. Test search and deletion interfaces with basic XSS payloads to confirm they're properly sanitized.📡 Detection & Monitoring
Log Indicators:
- Unusual search patterns containing script tags or JavaScript code in web server logs
- Multiple failed search attempts with suspicious payloads
Network Indicators:
- HTTP requests to Nagios XI containing script tags or JavaScript in query parameters
- Unusual outbound connections from Nagios XI server after user interactions
SIEM Query:
source="nagios_access.log" AND ("<script" OR "javascript:" OR "onerror=" OR "onload=") AND ("search" OR "delete")