Tags: fastbin malloc 

Rating:

`cat` is a good challenge to understand how `glibc heap` handles `fast bins`. You can populate the content of fast bins to influence the program data flow if the developers do not initialize the memory (allocated via `malloc`) correctly.

Original writeup (https://github.com/sajjadium/ctf-writeups/tree/master/AsisCTFQuals/2018/Cat).