PORT STATE SERVICE 21/tcp open ftp 22/tcp open ssh 80/tcp open http
visit web service on port number 80 and it looks like a static dashboard but has 1.pcap file, but unfortunately, it was a bank file. Tried for a different number instead of 1 like 2 and 3 but it redirects to the main page. Then tried 0, got the password and username nathan of FTP service.
use that credentials to login via ssh and got user.txt
for privilege escalation run linpeas.sh
got interesting files with capabilities, here is good article about privilege escalation capabilities https://www.hackingarticles.in/linux-privilege-escalation-using-capabilities/https://www.hackingarticles.in/linux-privilege-escalation-using-capabilities/
can also check it manually
getcap -r / 2>/dev/null
for escalating privileges
python3 -c 'import os; os.setuid(0); os.system("/bin/bash")'