Enumeration
Machine IP → 192.168.244.132
Network Scan
Nmap scan → nmap -A -Pn -p- -T4 -o nmap.txt 192.168.244.132
OS Detection → OS: Linux; CPE: cpe:/o:linux:linux_kernel
| Port | Service | Other details (if any) |
|---|---|---|
| 22 | SSH | OpenSSH 7.6p1 Ubuntu 4ubuntu0.3 (Ubuntu Linux; protocol 2.0) |
| 80 | HTTP | Apache httpd 2.4.29 ((Ubuntu)) |
Web Scan
GoBuster scan → gobuster dir -u http://192.168.244.132 -f -w /home/tanq/installations/SecLists/Discovery/Web-Content/directory-list-lowercase-2.3-medium.txt -x html,php,txt
Directories/files listed →
- index.html
- icons/ (403)
- javascript/ (403)
- mini.php
- robots.txt
- phpmyadmin/
Robots txt file lists Enum_this_Box as allowed.
Exploitation
The webpage mini.php is actually a shell interface with some limited options. This was used to read the local flag. This also had the functionality to upload files. This was used to upload the pentest monkey’s reverse shell code and get full shell.
Privilege Escalation
User
Looked at the /etc/passwd file, the users of importance are → root, goat, harry, karla, lissy, sally and oracle. The user oracle’s entry is → oracle:$1$|O@GOeN\$PGb9VNu29e9s6dMNJKH/R0:1004:1004:,,,:/home/oracle:/bin/bash. Using John the Ripper to crack this gives the credentials oracle:hiphop. This did not work for ssh though.
Running hydra to brute-force other users by using → hydra -l karla -P /home/tanq/installations/SecLists/rockyou.txt ssh://192.168.225.132. Ran linenum script for more enumeration, however, nothing useful was discovered. Tried user:user form of credentials for all users, which gave a success for goat:goat. This gives the user shell as user goat.
Root
Looking at sudo -l to enumerate privilege of the goat user, they are allowed to run /usr/bin/mysql as root without any password. MySQL has a functionality for spawning a shell. Executing sudo /usr/bin/mysql gives the mysql shell and using \! bash in the mysql shell spawns a bash shell as the user root. This gives the root flag.