high CVSS 7.5

CVE-2024-47525·PHP vulnerability

LibreNMS is an open-source, PHP/MySQL/SNMP-based network monitoring system. A Stored Cross-Site Scripting (XSS) vulnerability in the "Alert Rules" feature allows authenticated users to inject arbitrary JavaScript through the "Title" field. This vulnerability can lead to the execution of malicious code in the context of other users' sessions, potentially compromising their accounts and allowing unauthorized actions. This vulnerability is fixed in 24.9.0.

Severity
high
Software
PHP
Fixed in
24.9.0
Published
2024-10-01

Affected versions

Until: 24.9.0

Fixed in: 24.9.0

How to fix this CVE

LibreNMS users must upgrade to version 24.9.0 or later to patch a stored XSS vulnerability in the Alert Rules feature that permits authenticated attackers to inject malicious scripts through the Title field. This flaw can compromise admin sessions and enable unauthorized system modifications. Apply the update immediately to all LibreNMS installations, particularly those with multiple administrative users.

sudo dnf update php

Defensia detects this vulnerability

What an exploitation attempt looks like

Sample log line indicative of exploitation attempts:

POST.*alert.*rules.*(?:title|name)=[^&]*<script|onerror|onload|onclick|javascript:|eval\(|alert\(|document\.cookie|window\.location

WAF mitigation (if patching is not yet possible)

Add this rule to your WAF to block exploitation attempts while you schedule the patch. 

Implement WAF rules to block POST/PUT requests to alert rule endpoints containing HTML/JavaScript special characters in the Title parameter; whitelist only alphanumeric, spaces, hyphens, and underscores; apply input validation to reject <, >, ", ', and event handler attributes.

How to check if you are affected

  1. Step 1: Check LibreNMS version with: grep -i 'version' /opt/librenms/VERSION or curl http://localhost/api/v0/system 2>/dev/null | grep -i version
  2. Step 2: Verify if Alert Rules feature is accessible by checking /includes/html/print-alert-rules.php exists in LibreNMS installation directory
  3. Step 3: Search web server logs for script tags in POST requests to alert rule endpoints: grep -i '<script' /var/log/apache2/access.log /var/log/nginx/access.log | grep -i alert
  4. Step 4: Confirm the patch by verifying LibreNMS version is 24.9.0+ and checking the git commit hash includes 7620d220e48563938d869da7689b8ac3f7721490

FAQ

What is CVE-2024-47525?

CVE-2024-47525 is a stored cross-site scripting (XSS) vulnerability in LibreNMS's Alert Rules feature that allows authenticated administrators to inject arbitrary JavaScript through the Title field, potentially compromising other users' accounts and enabling unauthorized actions within the monitoring system.

Is CVE-2024-47525 being actively exploited?

No, this vulnerability is not currently listed in CISA's Known Exploited Vulnerabilities (KEV) catalog and no public exploits are available, though the risk remains significant for multi-user LibreNMS deployments with untrusted administrators.

What versions of PHP are affected by CVE-2024-47525?

All versions of LibreNMS prior to 24.9.0 are affected; the vulnerability is in LibreNMS's PHP code rather than PHP itself, so any PHP version running affected LibreNMS versions is at risk.

How do I check if my server is vulnerable to CVE-2024-47525?

Run 'cat /opt/librenms/VERSION' or check the LibreNMS web interface settings page; if the version is below 24.9.0, your system is vulnerable and requires immediate patching.

Does Defensia detect CVE-2024-47525?

Yes — Defensia's CVE advisory scanner compares installed package versions against the NVD database. If LibreNMS is installed on a monitored server, CVE-2024-47525 will appear in your dashboard with remediation steps.

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References

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