> 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/xss-reflected-in-an-attribute-with-encoded-angle-brackets.md).

# XSS Refletido em um Atributo com Colchetes Angulares Codificados

Notas sobre XSS Refletido em um Atributo com Colchetes Angulares Codificados para laboratórios da PortSwigger Web Security Academy, incluindo fluxo de exploração, teste de payloads, validação no Burp Suite e contexto de remediação cont

### XSS refletido em atributo com colchetes angulares codificados em HTML

Este laboratório contém uma vulnerabilidade de XSS refletida na funcionalidade de pesquisa do blog: o conteúdo fornecido pelo usuário é injetado no valor de um `valor` atributo de um `<input>`, e os `<` e `>` colchetes angulares são codificados em HTML (`&lt;`, `&gt;`). O objetivo é injetar um novo atributo que acione `alert()`.

<figure><img src="https://783634792-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-fc2d30b77cffcc51f165ad90b2f460bde2bc136c%2F%7B71527070-CD57-4432-8AD8-7E00987CB4F4%7D.png?alt=media" alt=""><figcaption></figcaption></figure>

#### Observações

* O texto inserido aparece no `valor` atributo do input.
* Tentar inserir `">test` é neutralizado pela codificação dos colchetes angulares, então você não pode abrir uma nova tag dessa forma.

```
">test
```

<figure><img src="https://783634792-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-a8dc691e0f73938c9846c0ea77e00539a883ba46%2F%7B82974CE5-7E55-4164-8A8F-751731A6044B%7D.png?alt=media" alt=""><figcaption></figcaption></figure>

No entanto, como o valor está entre aspas, é possível fechar o `valor` valor e adicionar um novo atributo ao mesmo `<input>` elemento ao injetar uma sequência contendo uma aspa dupla de fechamento.

```javascript
hola" test="hello
```

<figure><img src="https://783634792-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-76f3542f81c6d34e368d6a5efa49f164bc665173%2F%7B850D47D6-C680-4C82-BD99-5AD8970B57D3%7D.png?alt=media" alt=""><figcaption></figcaption></figure>

1. Feche o `valor` valor com uma aspa dupla injetada.
2. Adicione um novo atributo de evento (por exemplo, `onmouseover`) contendo a chamada para `alert()`.

```javascript
test" onmouseover="alert(0)
```

<figure><img src="https://783634792-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-2a68ee1711c4ef46404d981314e31082ad904249%2F%7B0E533FFC-4354-4775-8107-4E803A6783B4%7D.png?alt=media" alt=""><figcaption></figcaption></figure>

* O payload fecha o `valor` atributo e adiciona `onmouseover="alert(0)"` ao `<input>` elemento.

<figure><img src="https://783634792-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-c9ccfc3f244c3f139c144debed3eae8198b388e3%2F%7B192F39F4-2CA5-4E94-A757-93B77022B775%7D.png?alt=media" alt=""><figcaption></figcaption></figure>


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