CVE-2023-53688
📋 TL;DR
Nagios XI versions before 5.11.3 contain XSS and CSRF vulnerabilities in the Hypermap Replay component. Attackers can inject malicious scripts that execute in victims' browsers or trick authenticated users into performing unauthorized actions. Organizations running vulnerable Nagios XI instances are affected.
💻 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 uses it as a pivot point to attack internal systems.
Likely Case
Attacker steals user credentials or session tokens, modifies monitoring configurations, or creates false alerts to disrupt operations.
If Mitigated
Limited impact due to network segmentation, strong authentication, and browser security controls preventing script execution.
🎯 Exploit Status
XSS requires user interaction; CSRF requires authenticated victim to visit malicious page.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 5.11.3
Vendor Advisory: https://www.nagios.com/changelog/nagios-xi/
Restart Required: No
Instructions:
1. Backup current Nagios XI configuration. 2. Download Nagios XI 5.11.3 or later. 3. Follow Nagios XI upgrade documentation. 4. Verify upgrade completed successfully.
🔧 Temporary Workarounds
Disable Hypermap Replay
allTemporarily disable the vulnerable component until patching is possible.
Navigate to Admin > System Extensions > Manage Components, disable Hypermap Replay
Implement WAF Rules
allConfigure web application firewall to block XSS and CSRF attempts targeting Hypermap Replay endpoints.
🧯 If You Can't Patch
- Implement strict Content Security Policy headers to mitigate XSS impact
- Enforce SameSite cookies and CSRF tokens via reverse proxy configuration
🔍 How to Verify
Check if Vulnerable:
Check Nagios XI version in Admin > About page. If version is below 5.11.3, system is vulnerable.Check Version:
cat /usr/local/nagiosxi/var/xiversionVerify Fix Applied:
After upgrade, verify version is 5.11.3 or higher in Admin > About page.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /nagiosxi/admin/hypermapreplay.php
- JavaScript payloads in URL parameters or form submissions
Network Indicators:
- Multiple requests with similar parameters from different user sessions
- Requests containing script tags or event handlers
SIEM Query:
source="nagios_access.log" AND (uri="/nagiosxi/admin/hypermapreplay.php" AND (method="POST" OR params CONTAINS "<script>"))