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Showing posts from September, 2016

[Idea] False Biased Extraction for SQLi using Prime numbers

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I'm getting into this new style of blogging where I blog my unadulterated raw thoughts. Open to the ridicule of the entire world. Its liberating :) Its also very interesting to see how I make mistakes and what I learn from them, instead of just the monotonous, lifeless style of blogging what you got right or won at. So anyway here's todays thought...

A couple years ago, some dude from Immunity talked about how in "True"Blind SQLi it might be effective to favor responses that produce no-wait responses (here's the link: http://infiltratecon.com/miguelturner.html ). That is to say, if you are exploiting a Blind SQL injection vulnerability in which only time based responses are observable, it makes sense that responses that don't trigger sleeps or waits would get you information faster. Brilliant observation! This is quite clever because it allows you to throw the traditional computer science idea of efficiency out of the window (or rather the conventional idea c…

Abusing WebVTT and CORS for fun and profit

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WebVTT is a way html5 developers can display and cue text as subtitles for video formats. The grammar for WebVTT is pretty simple and as we know browsers are always willing to forgive any "weird" looking grammar in an effort to provide best effort experience for users. This post looks at ways to take advantage of WebVTT in some attack contexts in order to extract information or perform general DOM abuse.

Introduction
Video tags can make use of subtitle files, as follows:

WebVTT (subtitle) files need to follow this format:


The file merely describes cues, allows you to number them and associate a duration and display time for them. Display timestamps specify hours (hh), minutes (mm) , seconds (s) and milliseconds (ttt). According to my basically inspection of the grammar, most browser require you to respect the placeholders (significant figures) if you specify the magnitude. For instance, if you want to indicate hours you need to use both place holders, same goes for others. …

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