CVE-2016-15053
📋 TL;DR
Nagios XI versions before 5.2.4 contain a cross-site scripting vulnerability in the 'My Reports' listing page. Attackers can inject malicious scripts that execute in victims' browsers when viewing reports. 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
Attacker steals administrator session cookies, gains full control of Nagios XI, and pivots to monitored systems.
Likely Case
Attacker steals user session tokens to impersonate legitimate users and modify monitoring configurations.
If Mitigated
Script execution blocked by browser security features or web application firewall.
🎯 Exploit Status
Requires authenticated user interaction but no special privileges. Attack typically involves tricking users to click malicious links.
🛠️ 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 configuration. 2. Download Nagios XI 5.2.4 or later from Nagios website. 3. Follow upgrade instructions in documentation. 4. Verify upgrade completed successfully.
🔧 Temporary Workarounds
Disable My Reports Feature
allTemporarily disable the vulnerable 'My Reports' functionality until patching.
Navigate to Admin > System Extensions > Manage Components > Disable 'My Reports'
Implement Content Security Policy
allAdd CSP headers to restrict script execution sources.
Add 'Content-Security-Policy: script-src 'self'' to web server configuration
🧯 If You Can't Patch
- Restrict Nagios XI web interface access to trusted IP addresses only
- Implement web application firewall with XSS protection rules
🔍 How to Verify
Check if Vulnerable:
Check Nagios XI version in Admin > About page. If version is below 5.2.4, system is vulnerable.Check Version:
grep 'nagiosxi_version' /usr/local/nagiosxi/var/xiversionVerify Fix Applied:
After upgrade, verify version is 5.2.4 or higher and test 'My Reports' page for script injection.📡 Detection & Monitoring
Log Indicators:
- Unusual script tags in web access logs
- Multiple failed report generation attempts
Network Indicators:
- Suspicious JavaScript payloads in HTTP requests to /nagiosxi/reports/
SIEM Query:
source="nagios_access.log" AND (uri="/nagiosxi/reports/" AND (method="POST" OR method="GET") AND (content="<script>" OR content="javascript:"))