Following my previous blog post (Fusion level 05 solution), I continued my nightly quest for fun and solved the next challenge as well. As I try to keep my content unique and original, this blog post is mostly created due to the fact that as for today, there was no solution for this challenge on the internet.
This time we will examine the danger of unsafe shared data structures between multiple threads, as well as function arguments type mismatch causing an integer overflow leading to stack overrun exploit. In this blog post i will cover the concepts of controllable threads race-conditions, stack overflowing while making sure the flow of the program remains safe to the end of the function, where the return address is overwritten.
So let’s get to it.