CWE-268 Base Borrador High likelihood

Privilege Chaining

Privilege chaining occurs when an attacker combines two separate permissions or capabilities, neither of which is dangerous on its own, to perform a harmful action that neither permission should…

Definición

What is CWE-268?

Privilege chaining occurs when an attacker combines two separate permissions or capabilities, neither of which is dangerous on its own, to perform a harmful action that neither permission should individually allow.
This vulnerability is like a security bypass puzzle. A system might correctly enforce that a user cannot directly delete a file or directly write to a system directory. However, if the user can first move a file into that protected directory (using one permission) and then delete any file they own there (using a second permission), they have effectively achieved an unauthorized deletion. The core failure is that the system's security checks evaluate each privilege in isolation, missing the dangerous sequence they enable when used together. To prevent this, developers must design authorization checks that consider context and history, not just the immediate action. This involves analyzing how privileges can interact over a session or transaction. Implementing mandatory access control (MAC), logging and monitoring for unusual privilege sequences, and adhering to the principle of least privilege are key defenses. Always ask: 'Could these two allowed actions be combined to achieve something we explicitly forbid?'
Impacto en el mundo real

Real-world CVEs caused by CWE-268

  • CVE-2005-1736

    Chaining of user rights.

  • CVE-2002-1772

    Gain certain rights via privilege chaining in alternate channel.

  • CVE-2005-1973

    Application is allowed to assign extra permissions to itself.

  • CVE-2003-0640

    "operator" user can overwrite usernames and passwords to gain admin privileges.

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

This code allows someone with the role of "ADMIN" or "OPERATOR" to reset a user's password. The role of "OPERATOR" is intended to have less privileges than an "ADMIN", but still be able to help users with small issues such as forgotten passwords.

Vulnerable Java 
public enum Roles {
  	ADMIN,OPERATOR,USER,GUEST
  }
  public void resetPassword(User requestingUser, User user, String password ){
  		if(isAuthenticated(requestingUser)){
  				switch(requestingUser.role){
  						case GUEST:
  							System.out.println("You are not authorized to perform this command");
  							break;
  						case USER:
  							System.out.println("You are not authorized to perform this command");
  							break;
  						default:
  							setPassword(user,password);
  							break;
  						}
  				}
  		else{
  			System.out.println("You must be logged in to perform this command");
  		}
  }
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-268

  • Architecture and Design Consider following the principle of separation of privilege. Require multiple conditions to be met before permitting access to a system resource.
  • Architecture and Design / Operation Very carefully manage the setting, management, and handling of privileges. Explicitly manage trust zones in the software.
  • Architecture and Design / Operation Run your code using the lowest privileges that are required to accomplish the necessary tasks [REF-76]. If possible, create isolated accounts with limited privileges that are only used for a single task. That way, a successful attack will not immediately give the attacker access to the rest of the software or its environment. For example, database applications rarely need to run as the database administrator, especially in day-to-day operations.
Señales de detección

How to detect CWE-268

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-268 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.

Solicitar demo Probar Plexicus gratis
Preguntas frecuentes

Frequently asked questions

¿Qué es CWE-268?

Privilege chaining occurs when an attacker combines two separate permissions or capabilities, neither of which is dangerous on its own, to perform a harmful action that neither permission should individually allow.

¿Qué gravedad tiene CWE-268?

MITRE califica la probabilidad de explotación como Alta — esta debilidad se explota activamente en la práctica y debe priorizarse para su remediación.

¿Qué lenguajes o plataformas se ven afectados por CWE-268?

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

¿Cómo puedo prevenir CWE-268?

Consider following the principle of separation of privilege. Require multiple conditions to be met before permitting access to a system resource. Very carefully manage the setting, management, and handling of privileges. Explicitly manage trust zones in the software.

¿Cómo detecta y corrige Plexicus CWE-268?

El motor SAST de Plexicus detecta la firma de flujo de datos para CWE-268 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-268?

MITRE publica la definición canónica en https://cwe.mitre.org/data/definitions/268.html. También puedes consultar la documentación de OWASP y NIST para guías relacionadas.

Debilidades relacionadas

Weaknesses related to CWE-268

CWE-269 Padre

Improper Privilege Management

This vulnerability occurs when an application fails to correctly manage user permissions, allowing someone to perform actions or access…

CWE-250 Hermano

Execution with Unnecessary Privileges

This vulnerability occurs when software runs with higher permissions than it actually needs to perform its tasks. This excessive privilege…

CWE-266 Hermano

Incorrect Privilege Assignment

This vulnerability occurs when a system mistakenly grants a user, process, or entity a specific permission or privilege they should not…

CWE-267 Hermano

Privilege Defined With Unsafe Actions

This vulnerability occurs when a system grants a user, role, or process a specific permission that can be misused to perform dangerous,…

CWE-270 Hermano

Privilege Context Switching Error

This vulnerability occurs when an application fails to properly manage user permissions while moving between different security contexts,…

CWE-271 Hermano

Privilege Dropping / Lowering Errors

This vulnerability occurs when a system or process fails to reduce its elevated permissions before transferring control of a resource to a…

CWE-274 Hermano

Improper Handling of Insufficient Privileges

This vulnerability occurs when an application fails to properly manage situations where it lacks the necessary permissions to execute an…

CWE-648 Hermano

Incorrect Use of Privileged APIs

This vulnerability occurs when software incorrectly uses functions that require special permissions. Attackers can exploit these mistakes…

Recursos

Further reading

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