CVE-2011-10039
📋 TL;DR
This cross-site scripting (XSS) vulnerability in Nagios XI allows attackers to inject malicious scripts into the Alert Heatmap report and My Reports listing. When victims view these compromised pages, the attacker's scripts execute in their browser context, potentially stealing session cookies or performing actions as the victim. Organizations running Nagios XI versions before 2011R1.9 are affected.
💻 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 administrator session cookies, gains full administrative access to Nagios XI, modifies monitoring configurations, disables alerts, or uses the compromised system as a pivot point to attack internal networks.
Likely Case
Attacker steals user session cookies to gain unauthorized access to Nagios XI, views sensitive monitoring data, or performs limited administrative actions depending on victim's privileges.
If Mitigated
Script execution is blocked by browser security features or web application firewalls, resulting in no impact beyond potential UI disruption.
🎯 Exploit Status
Exploitation requires the attacker to have access to create or modify reports, then trick a victim into viewing them. No authentication bypass is involved.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2011R1.9
Vendor Advisory: https://www.nagios.com/changelog/nagios-xi/
Restart Required: No
Instructions:
1. Log into Nagios XI as administrator. 2. Navigate to Admin > Check for Updates. 3. Follow the upgrade wizard to install 2011R1.9 or later. 4. Verify the update completes successfully.
🔧 Temporary Workarounds
Input Validation Enhancement
allImplement additional input validation for report names and parameters in the web interface
Not applicable - requires code modification
🧯 If You Can't Patch
- Implement a web application firewall (WAF) with XSS protection rules to block malicious script injection
- Restrict report creation/modification permissions to trusted administrators only
🔍 How to Verify
Check if Vulnerable:
Check Nagios XI version via Admin > System Status > Version Information. If version is earlier than 2011R1.9, the system is vulnerable.Check Version:
Not applicable - use web interface at Admin > System Status > Version InformationVerify Fix Applied:
After upgrading, verify version is 2011R1.9 or later in Admin > System Status > Version Information. Test report creation with script-like input to ensure proper escaping.📡 Detection & Monitoring
Log Indicators:
- Unusual report creation/modification activity
- HTTP requests containing script tags or JavaScript in report parameters
- Multiple failed attempts to access report functionality
Network Indicators:
- HTTP traffic containing malicious script payloads in report-related requests
- Unusual patterns of report viewing from single IP addresses
SIEM Query:
source="nagios_xi_access.log" AND (uri="/nagiosxi/reports/" OR uri="/nagiosxi/heatmap/") AND (content="<script>" OR content="javascript:" OR content="onload=" OR content="onerror=")