CWE-585 Variante Borrador

Empty Synchronized Block

An empty synchronized block is a Java code construct where a synchronized block exists but contains no executable statements inside it.

Definición

What is CWE-585?

An empty synchronized block is a Java code construct where a synchronized block exists but contains no executable statements inside it.
An empty synchronized block is a logic flaw that fails to provide any actual thread safety or mutual exclusion. While the synchronized keyword is present, the block does nothing to protect shared data or coordinate threads, leaving critical sections of your code vulnerable to race conditions and concurrency bugs. This issue often arises during code maintenance, such as when a developer comments out or removes the internal logic for debugging but forgets to remove the now-useless synchronization wrapper. It serves as a clear red flag for developers to review that section of code, as it either indicates missing functionality or unnecessary overhead that can harm performance without benefit.
Impacto en el mundo real

Real-world CVEs caused by CWE-585

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 Java

The following code attempts to synchronize on an object, but does not execute anything in the synchronized block. This does not actually accomplish anything and may be a sign that a programmer is wrestling with synchronization but has not yet achieved the result they intend.

Vulnerable Java 
synchronized(this) { }
Ejemplo de código seguro

Secure Java

Instead, in a correct usage, the synchronized statement should contain procedures that access or modify data that is exposed to multiple threads. For example, consider a scenario in which several threads are accessing student records at the same time. The method which sets the student ID to a new value will need to make sure that nobody else is accessing this data at the same time and will require synchronization.

Seguro Java 
public void setID(int ID){
  	synchronized(this){
  		this.ID = ID;
  	}
  }
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-585

  • Implementation When you come across an empty synchronized statement, or a synchronized statement in which the code has been commented out, try to determine what the original intentions were and whether or not the synchronized block is still necessary.
Señales de detección

How to detect CWE-585

Automated Static Analysis High

Automated static analysis, commonly referred to as Static Application Security Testing (SAST), can find some instances of this weakness by analyzing source code (or binary/compiled code) without having to execute it. Typically, this is done by building a model of data flow and control flow, then searching for potentially-vulnerable patterns that connect "sources" (origins of input) with "sinks" (destinations where the data interacts with external components, a lower layer such as the OS, etc.)

Auto-corrección de Plexicus

Plexicus detecta automáticamente CWE-585 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-585?

An empty synchronized block is a Java code construct where a synchronized block exists but contains no executable statements inside it.

¿Qué gravedad tiene CWE-585?

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-585?

MITRE lists the following affected platforms: Java.

¿Cómo puedo prevenir CWE-585?

When you come across an empty synchronized statement, or a synchronized statement in which the code has been commented out, try to determine what the original intentions were and whether or not the synchronized block is still necessary.

¿Cómo detecta y corrige Plexicus CWE-585?

El motor SAST de Plexicus detecta la firma de flujo de datos para CWE-585 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-585?

MITRE publica la definición canónica en https://cwe.mitre.org/data/definitions/585.html. También puedes consultar la documentación de OWASP y NIST para guías relacionadas.

Debilidades relacionadas

Weaknesses related to CWE-585

CWE-1071 Padre

Empty Code Block

An empty code block occurs when a section of source code, such as a conditional statement or function body, contains no executable…

CWE-1069 Hermano

Empty Exception Block

This weakness occurs when a try-catch or try-finally block is present but contains no code to handle the caught exception or perform…

Recursos

Further reading

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