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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DOM-based XSS
This is an exotic variety of XSS. DOM-based XSS differs from other XSS by the fact that the XSS occurs by the execution of user-supplied input on the DOM of the browser instead of normally sneaking into the HTML, which is the case in typical XSS vulnerabilities. In other words, the user-supplied input is not generated as a part of the HTTP response body.
Let us consider the following piece of code to better understand DOM-based XSS:
<html>
<head>
<title>DOM-based XSS</title>
</head>
<body>
<script>
name = location.hash.substring(1);
document.write("<b>Hey "+unescape(name)+"! Nice to meet you</b>");
</script>
</body>
</html>This code takes an input from location.hash and then uses that to create a message using the document.write() ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.