Reconnaissance

First thing first, we run a quick initial nmap scan to see which ports are open and which services are running on those ports.

target="10.10.10.185"

ports=$(sudo nmap -p- --min-rate=1000 -T4 $target | grep "^[0-9]" | cut -d '/' -f 1 | tr '\\n' ',' | sed s/,$//)

sudo nmap -p$ports -sC -sV $target -vvv

PORT   STATE SERVICE REASON         VERSION
22/tcp open  ssh     syn-ack ttl 63 OpenSSH 7.6p1 Ubuntu 4ubuntu0.3 (Ubuntu Linux; protocol 2.0)
| ssh-hostkey: 
|   2048 06:d4:89:bf:51:f7:fc:0c:f9:08:5e:97:63:64:8d:ca (RSA)
| ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQClcZO7AyXva0myXqRYz5xgxJ8ljSW1c6xX0vzHxP/Qy024qtSuDeQIRZGYsIR+kyje39aNw6HHxdz50XSBSEcauPLDWbIYLUMM+a0smh7/pRjfA+vqHxEp7e5l9H7Nbb1dzQesANxa1glKsEmKi1N8Yg0QHX0/FciFt1rdES9Y4b3I3gse2mSAfdNWn4ApnGnpy1tUbanZYdRtpvufqPWjzxUkFEnFIPrslKZoiQ+MLnp77DXfIm3PGjdhui0PBlkebTGbgo4+U44fniEweNJSkiaZW/CuKte0j/buSlBlnagzDl0meeT8EpBOPjk+F0v6Yr7heTuAZn75pO3l5RHX
|   256 11:a6:92:98:ce:35:40:c7:29:09:4f:6c:2d:74:aa:66 (ECDSA)
| ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBOVyH7ButfnaTRJb0CdXzeCYFPEmm6nkSUd4d52dW6XybW9XjBanHE/FM4kZ7bJKFEOaLzF1lDizNQgiffGWWLQ=
|   256 71:05:99:1f:a8:1b:14:d6:03:85:53:f8:78:8e:cb:88 (ED25519)
|_ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIE0dM4nfekm9dJWdTux9TqCyCGtW5rbmHfh/4v3NtTU1
80/tcp open  http    syn-ack ttl 63 Apache httpd 2.4.29 ((Ubuntu))
|_http-title: Magic Portfolio
|_http-server-header: Apache/2.4.29 (Ubuntu)
| http-methods: 
|_  Supported Methods: GET HEAD POST OPTIONS
Service Info: OS: Linux; CPE: cpe:/o:linux:linux_kernel

We have two ports open.

• Port 22: running OpenSSH 7.6p1
• Port 80: running Apache httpd 2.4.29

Similarly, we run an nmap scan with the -sU flag enabled to run a UDP scan.

sudo nmap -Pn -sU --open -p- --min-rate 10000 $target

Before we move on to enumeration, let’s make some mental notes about the scan results.

• The OpenSSH version that is running on port 22 is not associated with any critical vulnerabilities, so it’s unlikely that we gain initial access through this port, unless we find credentials.
• Port 80 is running a web server. Since this is the only other port that is open, it is very likely to be our initial foothold vector.

Enumeration

Port 80 - Web HTTP server

Let’s visit the application from the web browser, and in the meanwhile we start enumerating directories with feroxbuster.