CVE-2025-29471
📋 TL;DR
A Cross-Site Scripting (XSS) vulnerability in Nagios Log Server v.2024R1.3.1 allows remote attackers to inject malicious scripts via the Email field. This could enable attackers to execute arbitrary code in the context of the victim's browser session. Organizations running Nagios Log Server v.2024R1.3.1 are affected.
💻 Affected Systems
- Nagios Log Server
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of Nagios Log Server instance leading to data exfiltration, privilege escalation, and lateral movement within the network.
Likely Case
Session hijacking, credential theft, and unauthorized access to log data and system information.
If Mitigated
Limited to client-side impact if proper input validation and output encoding are implemented.
🎯 Exploit Status
Exploitation requires user interaction (e.g., clicking a malicious link) and may need authentication to access the Email field.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Nagios changelog for latest version
Vendor Advisory: https://www.nagios.com/changelog/#log-server
Restart Required: Yes
Instructions:
1. Backup current configuration. 2. Download latest Nagios Log Server version from official site. 3. Follow Nagios upgrade documentation. 4. Restart services.
🔧 Temporary Workarounds
Input Validation and Sanitization
allImplement strict input validation and output encoding for the Email field to prevent XSS payloads.
Modify application code to sanitize email input using libraries like OWASP ESAPI or built-in language functions.
🧯 If You Can't Patch
- Implement Web Application Firewall (WAF) rules to block XSS payloads in the Email field.
- Restrict access to Nagios Log Server to trusted IPs only.
🔍 How to Verify
Check if Vulnerable:
Check Nagios Log Server version via web interface or command line.Check Version:
cat /usr/local/nagioslogserver/version.txtVerify Fix Applied:
Verify version is updated beyond v.2024R1.3.1 and test Email field for XSS vulnerabilities.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to email update endpoints with script tags or JavaScript payloads.
- Unexpected admin or user activity following email field modifications.
Network Indicators:
- HTTP requests containing malicious scripts in email parameters.
SIEM Query:
source="nagios_log_server" AND (http_request="*<script>*" OR http_request="*javascript:*")