CWE-583 Variante Incompleto

finalize() Method Declared Public

This vulnerability occurs when a Java class declares its finalize() method as public, violating secure coding practices for mobile code.

Definición

What is CWE-583?

This vulnerability occurs when a Java class declares its finalize() method as public, violating secure coding practices for mobile code.
In Java, the finalize() method is a special method called by the garbage collector before an object is destroyed. Declaring it as public breaks the intended contract, as this method should only ever be invoked automatically by the JVM's garbage collection process, not directly by application code. Explicit calls to finalize() are strongly discouraged and are a common source of errors and unpredictable behavior. For mobile code, such as applets or frameworks where code is downloaded and executed remotely, this flaw becomes a direct security threat. An attacker could exploit the publicly accessible finalize() method to trigger malicious logic, interfere with object cleanup, or cause a denial of service by manually invoking garbage collection routines. The secure practice is to always declare finalize() as protected, and within it, only call super.finalize().
Impacto en el mundo real

Real-world CVEs caused by CWE-583

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 Java Applet code mistakenly declares a public finalize() method.

Vulnerable Java 
public final class urlTool extends Applet {
  	public void finalize() {
  		...
  	}
  	...
  }
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-583

  • Implementation If you are using finalize() as it was designed, there is no reason to declare finalize() with anything other than protected access.
Señales de detección

How to detect CWE-583

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-583 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-583?

This vulnerability occurs when a Java class declares its finalize() method as public, violating secure coding practices for mobile code.

¿Qué gravedad tiene CWE-583?

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-583?

MITRE lists the following affected platforms: Java.

¿Cómo puedo prevenir CWE-583?

If you are using finalize() as it was designed, there is no reason to declare finalize() with anything other than protected access.

¿Cómo detecta y corrige Plexicus CWE-583?

El motor SAST de Plexicus detecta la firma de flujo de datos para CWE-583 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-583?

MITRE publica la definición canónica en https://cwe.mitre.org/data/definitions/583.html. También puedes consultar la documentación de OWASP y NIST para guías relacionadas.

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Recursos

Further reading

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