CWE-651 Variante Incompleto

Exposure of WSDL File Containing Sensitive Information

This vulnerability occurs when a Web Service Definition Language (WSDL) file, which acts as a public blueprint for a web service, is exposed in a way that reveals sensitive information about the…

Definición

What is CWE-651?

This vulnerability occurs when a Web Service Definition Language (WSDL) file, which acts as a public blueprint for a web service, is exposed in a way that reveals sensitive information about the application's internal structure or functionality.
A WSDL file is automatically generated to tell clients how to interact with a web service, detailing available methods, required parameters, and data types. The security risk arises when this technical specification is made accessible to a broader audience than intended, such as being publicly reachable on the internet instead of restricted to trusted developers or systems. This overexposure can provide attackers with a detailed map of your application's entry points. Specifically, the file often lists all service methods, including those that are internal, administrative, or deprecated and should not be publicly called. Attackers can use this information to discover hidden functionality, guess the names or locations of unprotected resources, and craft precise attacks against the backend logic. The problem is frequently compounded because WSDL generation is an automated process that may pull details directly from the code without security filtering.
Impacto en el mundo real

Real-world CVEs caused by CWE-651

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

    Identifica una ruta de código que maneje entrada no confiable sin validación.

  2. 2

    Crea un payload que ejercite el comportamiento inseguro — inyección, traversal, overflow o abuso de lógica.

  3. 3

    Envía el payload a través de una solicitud normal y observa la reacción de la aplicación.

  4. 4

    Itera hasta que la respuesta filtre datos, ejecute código del atacante o escale privilegios.

Ejemplo de código vulnerable

Vulnerable pseudo

MITRE no ha publicado un ejemplo de código para esta CWE. El patrón siguiente es ilustrativo — consulta Recursos para referencias canónicas.

Vulnerable pseudo
// Example pattern — see MITRE for the canonical references.
function handleRequest(input) {
  // Untrusted input flows directly into the sensitive sink.
  return executeUnsafe(input);
}
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-651

  • Architecture and Design Limit access to the WSDL file as much as possible. If services are provided only to a limited number of entities, it may be better to provide WSDL privately to each of these entities than to publish WSDL publicly.
  • Architecture and Design Make sure that WSDL does not describe methods that should not be publicly accessible. Make sure to protect service methods that should not be publicly accessible with access controls.
  • Architecture and Design Do not use method names in WSDL that might help an adversary guess names of private methods/resources used by the service.
Señales de detección

How to detect CWE-651

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-651

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-651?

This vulnerability occurs when a Web Service Definition Language (WSDL) file, which acts as a public blueprint for a web service, is exposed in a way that reveals sensitive information about the application's internal structure or functionality.

¿Qué gravedad tiene CWE-651?

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-651?

MITRE lists the following affected platforms: Web Server.

¿Cómo puedo prevenir CWE-651?

Limit access to the WSDL file as much as possible. If services are provided only to a limited number of entities, it may be better to provide WSDL privately to each of these entities than to publish WSDL publicly. Make sure that WSDL does not describe methods that should not be publicly accessible. Make sure to protect service methods that should not be publicly accessible with access controls.

¿Cómo detecta y corrige Plexicus CWE-651?

El motor SAST de Plexicus detecta la firma de flujo de datos para CWE-651 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-651?

MITRE publica la definición canónica en https://cwe.mitre.org/data/definitions/651.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.

Déjanos el contexto mínimo. Revisaremos el alcance y te indicaremos el siguiente paso comercial.

Antes de enviar — verifica que encajas

0 / 280

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