CVE-2011-10037
📋 TL;DR
This cross-site scripting vulnerability in Nagios XI allows attackers to inject malicious scripts into permalinks via xiwindow variables. When victims click these manipulated links, arbitrary JavaScript executes in their browser session. This affects all Nagios XI installations prior to version 2011R1.9.
💻 Affected Systems
- Nagios XI
📦 What is this software?
Nagios Xi by Nagios
Nagios Xi by Nagios
Nagios Xi by Nagios
Nagios Xi by Nagios
Nagios Xi by Nagios
Nagios Xi by Nagios
Nagios Xi by Nagios
Nagios Xi by Nagios
Nagios Xi by Nagios
Nagios Xi by Nagios
⚠️ Risk & Real-World Impact
Worst Case
Attacker steals authenticated session cookies, performs actions as the victim (including administrative actions), and potentially compromises the monitoring system or pivots to other systems.
Likely Case
Attacker steals session cookies to gain unauthorized access to the Nagios XI interface, potentially modifying monitoring configurations or accessing sensitive system information.
If Mitigated
With proper input validation and output encoding, malicious scripts are neutralized before execution, preventing successful exploitation.
🎯 Exploit Status
Exploitation requires the attacker to craft malicious URLs and trick authenticated users into clicking them. No authentication bypass is needed once the user is logged in.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2011R1.9 or 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 2011R1.9 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 Filter
allImplement server-side validation to sanitize xiwindow parameter values before processing.
Content Security Policy
allImplement strict CSP headers to restrict script execution sources.
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block XSS payloads in URL parameters
- Restrict access to Nagios XI web interface to trusted networks only
🔍 How to Verify
Check if Vulnerable:
Check Nagios XI version via the web interface (Help > About) or command line: grep 'nagiosxi_version' /usr/local/nagiosxi/var/xiversionCheck Version:
grep 'nagiosxi_version' /usr/local/nagiosxi/var/xiversionVerify Fix Applied:
Confirm version is 2011R1.9 or later and test permalink functionality with XSS test payloads like <script>alert('test')</script>📡 Detection & Monitoring
Log Indicators:
- Unusual URL parameters containing script tags or JavaScript in web server logs
- Multiple failed XSS attempts in application logs
Network Indicators:
- HTTP requests with suspicious parameters containing script tags or encoded JavaScript
SIEM Query:
source="web_server_logs" AND (uri="*<script*" OR uri="*javascript:*" OR uri="*onload=*" OR uri="*onerror=*")