CVE-2016-15052
📋 TL;DR
Nagios XI versions before 5.2.4 contain a cross-site scripting vulnerability in the Menu System of the web interface. Attackers can inject malicious scripts that execute in victims' browsers when they view manipulated menu items. This affects all Nagios XI administrators and users who access the web interface.
💻 Affected Systems
- Nagios XI
📦 What is this software?
Nagios Xi by Nagios
⚠️ Risk & Real-World Impact
Worst Case
An authenticated attacker could steal administrator session cookies, perform actions as the victim, or redirect users to malicious sites, potentially leading to full system compromise through privilege escalation.
Likely Case
Attackers with access to the Nagios XI interface could hijack user sessions, modify monitoring configurations, or deploy backdoors through script injection.
If Mitigated
With proper input validation and output encoding, the risk is limited to authenticated users exploiting the vulnerability, reducing overall impact.
🎯 Exploit Status
Exploitation requires authenticated access to the Nagios XI web interface. Attackers must craft malicious menu entries that victims will view.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 5.2.4 and later
Vendor Advisory: https://www.nagios.com/changelog/nagios-xi/
Restart Required: No
Instructions:
1. Backup current Nagios XI configuration and data. 2. Download Nagios XI 5.2.4 or later from the official Nagios website. 3. Follow the upgrade instructions in the Nagios XI documentation. 4. Verify the upgrade completed successfully.
🔧 Temporary Workarounds
Input Validation Enhancement
allImplement additional input validation for menu system fields to reject or sanitize script tags and special characters.
🧯 If You Can't Patch
- Implement web application firewall rules to block XSS payloads in menu parameters.
- Restrict access to Nagios XI web interface to trusted IP addresses only.
🔍 How to Verify
Check if Vulnerable:
Check Nagios XI version via the web interface dashboard or command line. Versions below 5.2.4 are vulnerable.Check Version:
cat /usr/local/nagiosxi/var/xiversionVerify Fix Applied:
After upgrading, verify the version is 5.2.4 or higher and test menu functionality for proper input sanitization.📡 Detection & Monitoring
Log Indicators:
- Unusual menu creation/modification events
- HTTP requests containing script tags or JavaScript in menu parameters
- Multiple failed authentication attempts followed by menu changes
Network Indicators:
- HTTP traffic containing suspicious script payloads in POST parameters
- Unusual outbound connections from Nagios XI server after menu interactions
SIEM Query:
source="nagios_xi_logs" AND (event="menu_modified" OR event="menu_created") AND (param CONTAINS "<script>" OR param CONTAINS "javascript:")