BitFriends's vuln

Author:
BitFriends

Language:
C/C++

Upload:
2020-04-09 17:52

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Platform:
Unix/linux etc.

Difficulty:
3.5

Quality:
5.0

Arch:
x86-64

Downloads:
24

Size:
16.30 KB

Writeups:
1

Comments:
7

Description

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

Comments (7)
Writeups (1)

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TecnoLinux on 2020-04-22 18:03: 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 2020-04-26 15:25: Hey @BitFriends, NULL byte is terminating my string, can you help.

ano12 on 2020-04-26 15:26: The printf stops at null byte, and it's a 64bit binary, so first 2 bytes are always going to be null,

BitFriends on 2020-04-26 17:25: fgets adds a \x00 byte at the end of the input everytime.

BitFriends on 2020-04-26 17:36: Tipp: Place a NULL byte at the end of your input

ano12 on 2020-04-26 17:58: But printf will stop when it gets a null byte i can't see how that would help

BitFriends on 2020-04-26 20:47: 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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Solution by nds on 2025-06-07 03:08:
if need modify,please inform me!

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BitFriends's vuln