An Integer Overflow is an attack used by hackers and security specialists that abuse the properties of signed and unsigned integers.
This year, google held a CTF competition. The qualifying for the CTF was called “beginners quest” and features miscelaneous challenges. It even has a story line.
The story is about getting a cake (that is hopefully not a lie) from a smart fridge. And in your quest to delicious glory you have to solve multiple challenges, including but not limited to:
- crypto (easy crypto)
- reverse engineering and binary exploitation
- crack password protected zips
- privilege escalation/ dirty cow
- fridge hacking
It is a non linear challenge which means, you have three different paths to solve it, and the ability to traverse from one path to the other at specific points:
You can watch me solve a path and gain the delicious cake that is waiting at the end. Or is it?
The Necromancer Challenge is an interesting vulnhub box with 11 flags in various disciplines.
It starts of with network monitoring via wireshark and continues with simple bas64 decoding and some hash/ password cracking.
The challenge offers a lot to play around including steganography, cracking, binary exploitation and reversing. There’s even a little web hacking involved, so there’s something for everyone.
Enjoy the full challenge in the playlist posted above.