CVE-2023-7312
📋 TL;DR
Nagios Fusion versions before 4.2.0 contain a stored cross-site scripting vulnerability in email settings configuration. Attackers with administrative access can inject malicious JavaScript that executes in other users' browsers when they view the affected administrative pages. This affects Nagios Fusion administrators and users with access to the administrative interface.
💻 Affected Systems
- Nagios Fusion
📦 What is this software?
Fusion by Nagios
⚠️ Risk & Real-World Impact
Worst Case
An attacker with administrative credentials could steal session cookies, perform actions as other users, redirect to malicious sites, or compromise administrative accounts to gain full control of the Nagios Fusion instance.
Likely Case
Privilege escalation within the Nagios Fusion application, session hijacking of administrative users, or credential theft leading to further system compromise.
If Mitigated
Limited to administrative interface only, with no impact on monitored systems or external services if proper access controls and network segmentation are in place.
🎯 Exploit Status
Exploitation requires administrative privileges to modify email settings. No public exploit code is known at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.2.0
Vendor Advisory: https://www.nagios.com/changelog/nagios-fusion/
Restart Required: No
Instructions:
1. Backup current configuration. 2. Download Nagios Fusion 4.2.0 from official Nagios website. 3. Follow upgrade instructions in documentation. 4. Verify email settings functionality post-upgrade.
🔧 Temporary Workarounds
Restrict Administrative Access
allLimit access to Nagios Fusion administrative interface to only trusted administrators using network controls and strong authentication.
Input Validation Rules
allImplement web application firewall rules to block XSS patterns in email configuration parameters.
🧯 If You Can't Patch
- Implement strict access controls to limit who can modify email settings
- Monitor and audit all changes to email configuration for suspicious patterns
🔍 How to Verify
Check if Vulnerable:
Check Nagios Fusion version via web interface or command line. If version is below 4.2.0, system is vulnerable.Check Version:
grep 'fusion_version' /usr/local/nagiosfusion/html/includes/config.inc.php 2>/dev/null || echo 'Check web interface About page'Verify Fix Applied:
After upgrading to 4.2.0, verify version shows 4.2.0 or higher and test email settings functionality.📡 Detection & Monitoring
Log Indicators:
- Unusual modifications to email/SMTP settings
- Administrative login from unexpected sources
- JavaScript payloads in configuration logs
Network Indicators:
- Unexpected outbound connections from Nagios Fusion server after administrative actions
- Suspicious HTTP requests containing script tags to configuration endpoints
SIEM Query:
source="nagios_fusion" AND (event="config_change" AND field="email_*" AND value MATCHES "<script")