Hack this site stego 118/30/2023 ![]() ![]() By packing HTML and JavaScript into the header data of the image file, you can end up with a valid image (JPG or PNG) file that will nonetheless be interpreted as HTML by a browser. This is sneaky because there’s exploit code that’s now runnable in your browser, but your anti-virus software won’t see it because it wasn’t ever written out - it was in the image and reconstructed on the fly by innocuous-looking “normal” JavaScript.Īnd here’s the coup de grâce. A little bit of JavaScript later, and you’ve reconstructed your code from the image. Reading it out is actually simple: the HTML canvas element has a built-in getImageData() method that reads the (numeric) value of a given pixel. OK, so the exploit code is hidden in the picture. But that would look strange, so instead the code is delivered steganographically by spreading the bits of the characters that represent the code among the least-significant bits in either a JPG or PNG image. He demonstrates that you can do this directly, by encoding characters of the code in the color values of the pixels. starts off by packing the real exploit code into an image. ![]() Why? Because nobody expects a picture to contain executable code. Stegosploit isn’t really an exploit, so much as it’s a means of delivering exploits to browsers by hiding them in pictures. We’re primarily hardware hackers, but every once in a while we see a software hack that really tickles our fancy. ![]()
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