> For the complete documentation index, see [llms.txt](https://hacking-notes.jord4n.pro/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hacking-notes.jord4n.pro/es/web/authentication/simple-2fa-bypass.md).

# Elusión sencilla de 2FA

### Evasión simple de 2FA

Este laboratorio usa autenticación de dos factores que puede ser eludida. Ya tenemos un nombre de usuario y una contraseña válidos, pero no tenemos acceso al código 2FA enviado a la víctima. El objetivo es acceder a la página de la cuenta de Carlos.

```bash
Tus credenciales: wiener:peter
Credenciales de la víctima: carlos:montoya
```

<figure><img src="/files/527d2364fe10b3acee85c382b17e195057a92ae0" alt=""><figcaption></figcaption></figure>

Después de iniciar sesión con las credenciales de Carlos, el servidor envía un código 2FA por correo electrónico. Al introducir este código de 4 dígitos, la solicitud se envía en **POST** al endpoint **/login2**.

<figure><img src="/files/8c5a399bb6b15966744a76bcb4ec91f330516387" alt=""><figcaption></figcaption></figure>

<figure><img src="/files/9c982ea14fb61095577227341df78aed554dc93f" alt="" width="499"><figcaption></figcaption></figure>

Sin embargo, es posible omitir completamente este paso. En lugar de enviar el código 2FA, simplemente solicita acceso directamente a **/my-account**. El servidor no comprueba correctamente el estado de validación de 2FA y permite el acceso a pesar de la falta de código.

<figure><img src="/files/160c1e53181202df3bacf397e04c8dd2a1f2e0a1" alt="" width="563"><figcaption></figcaption></figure>


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