Author:
BitFriends

Language:
C/C++

Upload:
5:52 PM 04/09/2020

Download

Platform
Unix/linux etc.

Difficulty:
3.5

Quality:
5.0

Arch:
x86-64

Description

Welcome to this crackme. I am waiting for your solutions!

• Comments
• Solutions

TecnoLinux on 6:03 PM 04/22/2020: This challenge is hard because we dont know what to look for, my close theory is that we have to do a GOT to do something.

ano12 on 3:25 PM 04/26/2020: Hey @BitFriends, NULL byte is terminating my string, can you help.

ano12 on 3:26 PM 04/26/2020: The printf stops at null byte, and it's a 64bit binary, so first 2 bytes are always going to be null,

BitFriends on 5:25 PM 04/26/2020: fgets adds a \x00 byte at the end of the input everytime.

BitFriends on 5:36 PM 04/26/2020: Tipp: Place a NULL byte at the end of your input

ano12 on 5:58 PM 04/26/2020: But printf will stop when it gets a null byte i can't see how that would help

BitFriends on 8:47 PM 04/26/2020: The Null Byte at the end is for tricking fgets. Place the format parameters before the address you want to write to. So it doesn't matter if printf stops at a null byte, because you have entered everything you need.

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