CVE-2018-25119
📋 TL;DR
This cross-site scripting vulnerability in Nagios Fusion allows attackers to inject malicious scripts via the 'fusionwindow' parameter. When exploited, these scripts execute in victims' browsers, potentially stealing session cookies or performing unauthorized actions. Organizations running Nagios Fusion versions before 4.1.5 are affected.
💻 Affected Systems
- Nagios Fusion
📦 What is this software?
Fusion by Nagios
⚠️ Risk & Real-World Impact
Worst Case
Attacker steals administrator session cookies, gains full administrative access to Nagios Fusion, and potentially compromises the entire monitoring infrastructure.
Likely Case
Attacker steals user session cookies, performs unauthorized actions within Nagios Fusion, or redirects users to malicious sites.
If Mitigated
Script execution is blocked by browser security features or web application firewalls, limiting impact to minor UI disruption.
🎯 Exploit Status
Exploitation requires user interaction (victim must click malicious link) and knowledge of the vulnerable parameter.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.1.5
Vendor Advisory: https://www.nagios.com/changelog/nagios-fusion/
Restart Required: No
Instructions:
1. Backup current Nagios Fusion configuration. 2. Download Nagios Fusion 4.1.5 from official Nagios website. 3. Follow upgrade instructions in Nagios Fusion documentation. 4. Verify upgrade completed successfully.
🔧 Temporary Workarounds
Web Application Firewall Rules
allImplement WAF rules to block malicious script patterns in the fusionwindow parameter
Content Security Policy
allImplement strict CSP headers to prevent script execution from untrusted sources
🧯 If You Can't Patch
- Implement network segmentation to restrict access to Nagios Fusion only to authorized users
- Enable browser security features like XSS filters and disable JavaScript execution for untrusted sources
🔍 How to Verify
Check if Vulnerable:
Check Nagios Fusion version via web interface or configuration files. If version is below 4.1.5, system is vulnerable.Check Version:
grep 'version' /usr/local/nagiosfusion/etc/version.txtVerify Fix Applied:
After patching, verify version shows 4.1.5 or higher and test that script injection in fusionwindow parameter is properly sanitized.📡 Detection & Monitoring
Log Indicators:
- Unusual length or special characters in fusionwindow parameter values
- Multiple failed script injection attempts in web logs
Network Indicators:
- HTTP requests containing script tags or JavaScript in fusionwindow parameter
SIEM Query:
source="nagios_fusion_logs" AND (fusionwindow CONTAINS "<script>" OR fusionwindow CONTAINS "javascript:")