CVE-2023-7313
📋 TL;DR
Nagios XI versions before 5.11.3 contain a cross-site scripting vulnerability in the Bulk Modifications tool. Attackers can inject malicious scripts that execute in victims' browsers when they view manipulated content. This affects all Nagios XI administrators and users who access the vulnerable 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 administrative access to Nagios XI, and potentially compromises the monitoring infrastructure and monitored systems.
Likely Case
Attacker steals user session tokens, performs unauthorized actions within Nagios XI, or redirects users to malicious sites.
If Mitigated
Script execution is blocked by browser security features or Content Security Policy, limiting impact to minor UI disruption.
🎯 Exploit Status
Requires authenticated access to Nagios XI and victim interaction with crafted content.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 5.11.3 or later
Vendor Advisory: https://www.nagios.com/changelog/nagios-xi/
Restart Required: No
Instructions:
1. Backup current Nagios XI installation. 2. Download Nagios XI 5.11.3 or later from Nagios customer portal. 3. Follow upgrade instructions in Nagios XI documentation. 4. Verify upgrade completed successfully.
🔧 Temporary Workarounds
Restrict Bulk Modifications Access
allLimit access to Bulk Modifications tool to only essential administrators using Nagios XI role-based access controls.
Implement Content Security Policy
allAdd Content Security Policy headers to block inline script execution in Nagios XI web interface.
🧯 If You Can't Patch
- Implement strict input validation and output encoding for Bulk Modifications tool parameters
- Monitor for suspicious activity in Nagios XI access logs and audit trails
🔍 How to Verify
Check if Vulnerable:
Check Nagios XI version via Admin > System Config > About page or run: grep 'nagiosxi_version' /usr/local/nagiosxi/var/xiversionCheck Version:
grep 'nagiosxi_version' /usr/local/nagiosxi/var/xiversionVerify Fix Applied:
Confirm version is 5.11.3 or higher using same method as checking vulnerability.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to bulk modification endpoints
- Suspicious script-like patterns in URL parameters or form data
Network Indicators:
- Multiple failed authentication attempts followed by successful login and bulk modification access
SIEM Query:
source="nagios_xi_access.log" AND (uri_path="/nagiosxi/admin/bulk*" OR uri_path="/nagiosxi/includes/components/bulk*") AND (param_contains="<script>" OR param_contains="javascript:")