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[EN] Johnny

tags: Writeup Crypto English

FlyDragon

Step.1

Download passwd and shadow
They are related to a linux account

Step.2

Challenge name Johnny , which let you know this challenge can be solved with John the ripper

$ unshadow passwd shadow > unshadow

$ john --format=crypt unshadow

Get the password and account

Johnny:passw0rd:1001:1001::/home/Johnny:/bin/sh

Step.3

$ nc lotuxctf.com 30005

Login to get the flag

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LoTuX CTF
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[CH] Cookie Stealer

[name=FlyDragon]

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[EN] Cookie Stealer

[name=FlyDragon]

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LoTuX CTF 投稿說明

在 LoTuX 平台上取得 2000 分以上

Apr 4, 2025
[EN] Rev C 2

[name=FlyDragon] Step.1 By observing output.txt and executing the code, it can be inferred that the program flag.exe will output the flag after shuffling it. Step.2 By examining main() using Ghidra, it can be discovered that this program reads in the contents of flag.txt and outputs them after performing specific swaps in a particular order. order = [5, 13, 0, 12, 1, 16, 3, 2, 8, 7, 15, 4, 6, 17, 11, 10, 9]

Nov 1, 2023
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Published on HackMD