downloadbrowseMazrock's crackmypadre

Download crackmypadre.zip, 3 kb (password: crackmes.de)
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Hello admin, here is a crackme that I made.

As you can see it's a crackme for unix/linux OS. (more precisely, it's a keyfileme)

The principal aim is to find the unique password that this crackme contains.

But the routine is dynamic, to uncover the solution, the routine relies on PIDs of father/child coming from a fork().

This program tries to open and read a file named "livret_famille" (yeah sorry i'm French and this challenge was supposed to be for a french contest).
In this file, the program tries to get 2 numbers, the 2 PIDs of the father and child.

That's make it dynamic, everytime the PIDs change.

Then, If there is a file named "livret_famille" containing the PIDs of the 2 process => WIN, if not => FAIL.

But to make it harder, there is a protection that I made. It's an anti-debugging technique based on the presence or not of certain programs in the process list (like gdb, ddd etc...): for instance, if there is a process with the name "gdb crackmypadre" in the process list, my program will stop and print a message saying that the user shouldn't open a debugger ;)


If i remember, the final password is something like "0mg0d", anyway there is only 1 password, so if you see "** Le mot de passe pour valider est ..." ("the password to valid the solution is...", you are done.


If you are a little bit interested in this challenge I can provide you the source code.


Bye

Difficulty: 2 - Needs a little brain (or luck)
Platform: Unix/linux etc.
Language: C/C++

Published: 24. Jan, 2011
Downloads: 443

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Solutions

Solution by s3Rious, published 30. jul, 2013; download (6 kb), password: crackmes.de or browse.

s3Rious has rated this crackme as nothing special.

Solution by Yoha, published 14. feb, 2013; download (7 kb), password: crackmes.de or browse.

Yoha has not rated this crackme yet.

Solution by stupid, published 14. feb, 2013; download (970 b), password: crackmes.de or browse.

stupid has not rated this crackme yet.

Solution by Matir, published 11. feb, 2011; download (518 b), password: crackmes.de or browse.

Matir has not rated this crackme yet.

Solution by tiriki, published 11. feb, 2011; download (610 b), password: crackmes.de or browse.

tiriki has not rated this crackme yet.

The submission of solutions is closed.

Discussion and comments

lagalopex
07. Feb 2011		Ehm, I think here is something wrong?! Or why is the cm explained? ;)
Mazrock
Author
13. Feb 2011		lagalopex: I don't know, I think the admin/moderator made a little mistake by posting the solution :(


And I don't have any chance to edit this.

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