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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Denial of Service
Denial of Service (DoS) techniques must only be tested in a controlled environment, in which it is easy to recover if the application goes down. Never try them on production systems.
We can force certain image parsing applications or libraries to crash when they try to parse a malformed image file. Today, image parsing code is available in most web applications in the form of image upload, resize, and so on. Let's go through some of the documented techniques of DoS through image files.
The following documented techniques were publicly disclosed by a HackerOne user who goes by the dutchgraa username.
Malicious JPEG file – pixel flood
This technique exploits the way image parsers parse a JPG or JPEG file. Simply speaking, initially, ...
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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.