CWE-577 Variante Borrador

EJB Bad Practices: Use of Sockets

This vulnerability occurs when an Enterprise JavaBeans (EJB) component breaks the EJB specification by directly creating or using network sockets.

Definición

What is CWE-577?

This vulnerability occurs when an Enterprise JavaBeans (EJB) component breaks the EJB specification by directly creating or using network sockets.
The EJB specification sets clear rules to ensure components are portable and behave consistently across different application servers. One of these rules explicitly forbids EJB beans from acting as network servers—meaning they must not open sockets to listen for or accept incoming connections. This restriction preserves the server's ability to manage resources, control the bean's lifecycle, and maintain transactional integrity. Allowing an EJB to become a socket server conflicts with its primary role as a managed component serving EJB clients. It can destabilize the container, interfere with clustering and load balancing, and create unpredictable security and performance issues. Instead, socket-based server functionality should be implemented outside the EJB container, in a managed service or a dedicated layer, keeping the bean's design aligned with its intended client-serving architecture.
Impacto en el mundo real

Real-world CVEs caused by CWE-577

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 Java example is a simple stateless Enterprise JavaBean that retrieves stock symbols and stock values. The Enterprise JavaBean creates a socket and listens for and accepts connections from clients on the socket.

  2. 2

    And the following Java example is similar to the previous example but demonstrates the use of multicast socket connections within an Enterprise JavaBean.

  3. 3

    The previous two examples within any type of Enterprise JavaBean violate the EJB specification by attempting to listen on a socket, accepting connections on a socket, or using a socket for multicast.

Ejemplo de código vulnerable

Vulnerable Java

The following Java example is a simple stateless Enterprise JavaBean that retrieves stock symbols and stock values. The Enterprise JavaBean creates a socket and listens for and accepts connections from clients on the socket.

Vulnerable Java 
@Stateless
  public class StockSymbolBean implements StockSymbolRemote {
  		ServerSocket serverSocket = null;
  		Socket clientSocket = null;
  		public StockSymbolBean() {
  				try {
  					serverSocket = new ServerSocket(Constants.SOCKET_PORT);
  				} catch (IOException ex) {...}
  				try {
  					clientSocket = serverSocket.accept();
  				} catch (IOException e) {...}
  		}
  		public String getStockSymbol(String name) {...}
  		public BigDecimal getStockValue(String symbol) {...}
  		private void processClientInputFromSocket() {...}
  }
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-577

  • Architecture and Design / Implementation Do not use Sockets when writing EJBs.
Señales de detección

How to detect CWE-577

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.

Auto-corrección de Plexicus

Plexicus detecta automáticamente CWE-577 y abre un PR de corrección en menos de 60 segundos.

Codex Remedium escanea cada commit, identifica esta debilidad concreta y entrega un pull request listo para revisión con el parche. Sin tickets. Sin traspasos.

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Preguntas frecuentes

Frequently asked questions

¿Qué es CWE-577?

This vulnerability occurs when an Enterprise JavaBeans (EJB) component breaks the EJB specification by directly creating or using network sockets.

¿Qué gravedad tiene CWE-577?

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-577?

MITRE lists the following affected platforms: Java.

¿Cómo puedo prevenir CWE-577?

Do not use Sockets when writing EJBs.

¿Cómo detecta y corrige Plexicus CWE-577?

El motor SAST de Plexicus detecta la firma de flujo de datos para CWE-577 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-577?

MITRE publica la definición canónica en https://cwe.mitre.org/data/definitions/577.html. También puedes consultar la documentación de OWASP y NIST para guías relacionadas.

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Recursos

Further reading

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