pufferisadev's lisence

Author:
pufferisadev

Language:
C/C++

Upload:
2023-08-01 07:21

Download

Platform:
Mac OS X

Difficulty:
2.2

Quality:
4.0

Arch:
x86-64

Downloads:
13

Writeups:
1

Comments:
6

Description

The goal is to either make any key correct or just entirely bypass the key checker

Comments (6)
Writeups (1)

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lalalaland on 2023-08-03 12:13: Cool challenge.

lalalaland on 2023-08-09 20:04: It uses systime as seed value for the random function (hint). Make a python script and pipe it!

cnathansmith on 2023-08-16 21:24: It won't allow uploading a second solution, but here is a follow-up implementing the time-based attack https://github.com/charlesnathansmith/crackmes/blob/main/lisence_checker/timing.md

Nox on 2024-08-25 07:14: It uses system time as a seed for the random function. The goal was either to make any key correct or bypass the checker. I bypassed the checker and made it always call the success() method. Check the solutions to see me simple solution.

Andrysqui on 2024-12-31 20:25: overall pretty easy, I like that there are LOTS of possible solutions for this crackme. maybe I'll try it again soon

LuLusum on 2025-06-04 01:34: keep it up! Nice one. use ghidra find out the logic and lldb + c to find the key.

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Solution by cnathansmith on 2023-08-06 10:51:
Overview of both requested bypass types, plus a buffer overflow solution.

Download

crackmes.one

crackmes.one

pufferisadev's lisence_checker