MITRE CTF 2013 – bin200 #1

We’re given an ELF binary. Opening this in IDA, the strings dump shows that this is a crackme.

Looking at the location of the invalid CD key message, it’s immediately clear where we need to end up.

We step through the program in gdb, and use set $eip =   to force the program to follow our desired jumps. Once we are where we want to be, we let the program run and are presented with our key.