destructeur's Sh4ll10.1

Author:
destructeur

Language:
C/C++

Upload:
2020-02-20 17:22

Download

Platform:
Unix/linux etc.

Difficulty:
2.5

Quality:
4.0

Arch:
x86-64

Downloads:
24

Size:
14.73 KB

Writeups:
4

Comments:
11

Description

You have to find a flag. The program may tell you if the one you gave in input is good.

Comments (11)
Writeups (4)

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timotei on 2020-02-24 19:28: "Well played! This is the only valid flag." Easy to trace. Good for beginners. Level 1.

ragnar_crackbeard87 on 2020-02-26 00:06: I hope someone writes a solution for this. I have been trying it all day. I got the first key easily enough, the one that doesn't print anything '1a4f'... However I've reversed every single line of user-code in this thing and can't figure out how this can work. I patched it but certainly that's not the solution, as I see timotei posted the actual good-boy.

4rr4y on 2020-02-26 00:48: @ragnar_crackbeard87 I submitted a solution but its pending approval i think~ perhaps a good hint for you is there is more stuff other than the main() function :)

ragnar_crackbeard87 on 2020-02-26 04:26: Thank you 4rr4y I GOT IT FINALLLY :):) A perfect hint. It told me hardly anything but i knew to stop trying to figure out how this main code could possibly be doing some magical jump haha

luc4sb3rt1n on 2020-03-14 15:43: @timotei, what you mean by "Easy to trace"? Just to be clear, I did it but debugging with gdb. Do you know any other (easy) way to get that?

tim0tei on 2020-03-15 09:33: @luc4sb3rt1n What I meant was that the codeflow is good to follow and understandable.

luc4sb3rt1n on 2020-03-15 15:21: Oh, got it @timetei, thanks

robon on 2020-04-24 01:52: @luc4sb3rt1n Use edb-debuger

ttotons on 2020-05-10 17:10: Wow finally I did. As a beginner it took me days until I used some hints, because I wasn't getting any closer. :) But I gained some experience.

mistilteinn on 2020-05-11 10:55: look at author's name : )

tristansca on 2020-11-09 00:22: How do you extract it it asks for code?

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Solution by jeffli6789 on 2020-02-25 03:09:

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Solution by 4rr4y on 2020-02-25 09:56:
Learnt more about ELFs :)

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Solution by HinataDeku on 2020-04-01 20:16:
Thank you! fun one!

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Solution by patoLocosc on 2020-07-16 05:50:
My approach about how I solved this problem. :)

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crackmes.one

crackmes.one

destructeur's Sh4ll10.1