Integer Overflow SimpleSums Writeup

Hi, I’m David Eduardo Karpinski and today we’ll solve a MetaCTF challenge and you’ll learn about the low-level Integer Overflow vulnerability. If you haven’t seen my latest article about Password Cracking, check it out now! Spoiler: it’s interesting.

Numbers in C

In C, numeric values are signed by default, which means they can be negative or positive. In contrast, unsigned values only allow positive numbers. A 32-bit unsigned integer can have a maximum value of 2³², with …

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