CWE-541 Variante Incompleto

Inclusion of Sensitive Information in an Include File

This vulnerability occurs when sensitive data like passwords or system details is placed inside a publicly accessible include file. Attackers can directly request these files to steal credentials…

Definición

What is CWE-541?

This vulnerability occurs when sensitive data like passwords or system details is placed inside a publicly accessible include file. Attackers can directly request these files to steal credentials and compromise the application.
Include files (like .inc, .config, or library files) are often used to store common code or configuration settings. When these files contain hard-coded secrets such as database passwords, API keys, or administrative credentials, and are left in a web-accessible directory, they become a prime target. Attackers can simply browse to the file's URL to download its full source code, bypassing the main application's security controls entirely. To prevent this, never store sensitive information within web-accessible include files. Instead, move configuration containing secrets outside the web root or into environment variables and protected configuration files. Additionally, configure your web server to deny requests to files with common include extensions, and ensure your deployment process cleans directories of development or backup files that might inadvertently expose data.
Impacto en el mundo real

Real-world CVEs caused by CWE-541

Todavía no hay CVEs públicos enlazados a esta CWE en el catálogo de MITRE.

Cómo lo explotan los atacantes

Ruta del atacante paso a paso

  1. 1

    The following code uses an include file to store database credentials:

  2. 2

    database.inc

  3. 3

    login.php

  4. 4

    If the server does not have an explicit handler set for .inc files it may send the contents of database.inc to an attacker without pre-processing, if the attacker requests the file directly. This will expose the database name and password.

Ejemplo de código vulnerable

Vulnerable PHP

database.inc

Vulnerable PHP
<?php
  $dbName = 'usersDB';
  $dbPassword = 'skjdh#67nkjd3$3$';
  ?>
Ejemplo de código seguro

Secure pseudo

Seguro pseudo
// Validate, sanitize, or use a safe API before reaching the sink.
function handleRequest(input) {
  const safe = validateAndEscape(input);
  return executeWithGuards(safe);
}
What changed: the unsafe sink is replaced (or the input is validated/escaped) so the same payload no longer triggers the weakness.
Lista de prevención

How to prevent CWE-541

  • Architecture and Design Do not store sensitive information in include files.
  • Architecture and Design / System Configuration Protect include files from being exposed.
Señales de detección

How to detect CWE-541

SAST High

Ejecuta análisis estático (SAST) sobre el código buscando el patrón inseguro en el flujo de datos.

DAST Moderate

Ejecuta pruebas dinámicas de seguridad de aplicaciones (DAST) contra el endpoint en vivo.

Runtime Moderate

Vigila los logs en tiempo de ejecución para detectar trazas de excepción inusuales, entradas malformadas o intentos de bypass de autorización.

Code review Moderate

Revisión de código: marca cualquier código nuevo que maneje entrada desde esta superficie sin usar los helpers validados del framework.

CWE-541

Don't catalog this weakness. Prove it's reachable.

Plexicus turns CWE catalogs into evidence: every CWE-pattern is matched against your real code graph, reach is proven on a sandbox clone, and verified findings ship as reviewed PRs.

Preguntas frecuentes

Frequently asked questions

¿Qué es CWE-541?

This vulnerability occurs when sensitive data like passwords or system details is placed inside a publicly accessible include file. Attackers can directly request these files to steal credentials and compromise the application.

¿Qué gravedad tiene CWE-541?

MITRE no ha publicado una calificación de probabilidad de explotación para esta debilidad. Trátala como de impacto medio hasta que tu modelo de amenazas demuestre lo contrario.

¿Qué lenguajes o plataformas se ven afectados por CWE-541?

MITRE no ha especificado plataformas afectadas para esta CWE — puede aplicar a la mayoría de los stacks de aplicaciones.

¿Cómo puedo prevenir CWE-541?

Do not store sensitive information in include files. Protect include files from being exposed.

¿Cómo detecta y corrige Plexicus CWE-541?

El motor SAST de Plexicus detecta la firma de flujo de datos para CWE-541 en cada commit. Cuando hay coincidencia, nuestro agente Codex Remedium abre un PR de corrección con el código corregido, las pruebas y un resumen de una línea para el revisor.

¿Dónde puedo aprender más sobre CWE-541?

MITRE publica la definición canónica en https://cwe.mitre.org/data/definitions/541.html. También puedes consultar la documentación de OWASP y NIST para guías relacionadas.

¿Listo para validar lo que importa?

Listo para validar lo que importa.

Plexicus es Proof-Driven AppSec: hallazgos validados, comprensión contextual y remediación revisada — anclada en evidencia, acotada contigo.

Calificación

Comprueba si el AI Swarm Pentest encaja en tu entorno.

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Antes de enviar — verifica que encajas

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Sin compromiso. Si no encajas, te lo decimos.

SAMPLE HANDOVER · ILLUSTRATIVE

Sample evidence handover

A trimmed view of what your team receives at the end of an AI Swarm Pentest engagement. Real engagements include full technical evidence, executive narrative, and a remediation plan.

VALIDATED FINDING Evidence attached

Server-Side Request Forgery in webhooks/receiver

demo-project/sample-app · src/webhooks/receiver.py:42

SeverityHigh CVSS 3.18.6 Priority79 Confirmedvia replay

Untrusted caller-supplied URLs reach an internal egress without an allowlist. Replayed in a sandbox against a fresh authorized target — the same control was validated to fail twice.

REVIEWER-READY REMEDIATION Merge-ready PR

Validate the target URL against an allowlist of permitted hostnames. Reject private/internal IP ranges. Enforce HTTPS only.

plexicus/remediation/webhooks-ssrf 3 changed · 0 new files
42resp = requests.get(target_url)
42+if not is_allowed_host(target_url):
43+  raise WebhookRejected(target_url)
44+resp = requests.get(target_url, timeout=5)
Every engagement hands over:
  • Executive briefing
  • Validated findings list
  • Merge-ready PRs
  • Compliance mapping (NIS2 · DORA · CRA)
Ronda privada Para inversores