> 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/es/web/xss/xss-in-a-javascript-string-with-apostrophe-and-backslash-escaped.md).

# XSS en una cadena de JavaScript con apóstrofo y barra invertida escapados

### XSS reflejado en una cadena de JavaScript con comilla simple y barra invertida escapadas

XSS reflejado en la función de seguimiento de términos de búsqueda. El valor reflejado se inserta en una cadena de JavaScript; las comillas simples y las barras invertidas se han escapado, lo que dificulta la evasión.

Objetivo

* Salir de la cadena de JavaScript escapada y llamar a `alert()`.

<figure><img src="/files/60d4c5ecd70fd1b022f6b729bb79c8bd418c45bc" alt=""><figcaption></figcaption></figure>

Observaciones actuales

* Si `prueba` se envía, el valor se almacena en la `searchTerm` variable del script.
* Intento de introducir una nueva variable:/ `testing'; var=test='thisIsATest`/ → Se observa que las comillas y las barras invertidas () se inyectan/presentan e impiden la inyección directa.

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

* Simplemente insertar la etiqueta de cierre del script puede cerrar el contexto del script: `</script>`

```javascript
</script>
```

<figure><img src="/files/e0ca67286b1058bf0b1749b7b6191340354124d0" alt=""><figcaption></figcaption></figure>

* Después de cerrar, se puede renderizar texto HTML simple: `</script><h1>HACK</h1>`

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

<figure><img src="/files/949fa01d7bd6396d2c6df80a482986f5e32aa18e" alt=""><figcaption></figcaption></figure>

* Y, finalmente, es posible ejecutar un `alerta` añadiendo un nuevo `<script>` después de cerrar: `</script><script>alert(0)</script>`

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

<figure><img src="/files/65ce67f1b517bc39ddac6b8bba03362cb2104cb6" alt=""><figcaption></figcaption></figure>


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