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Day 048 #FromZeroToHacker – Protocols and Servers 2

In the Protocols and Servers lesson, we covered Telnet, HTTP, POP3, and more. Let’s see how they can be attacked and defended.

HTTP, FTP, POP3… How does each one work? What do they do? How they can talk to us? Let’s have a close look at protocols.

In the first lesson of the Network Security Module, we focused on passive reconnaissance. In this one, we will focus on active reconnaissance.

In passive reconnaissance, we rely on public knowledge we can access without engaging the target to gather information about it.

We have found targets and scanned them and their ports. Now it is time for Service and OS detection, Nmap scripts and saving scan results.

We have just covered Nmap Basic Port Scans, including TCP flags and TCP 3-way handshake. Time for Nmap Advanced Port Scans 🙂

After discovering live hosts with Nmap, now is the time to go deeper by scanning their ports.

When we are about to attack a website, we want to know which systems are up and what services are running. Nmap can answer those questions.

Time for a new Capture The Flag (CTF)! Pickle Rick is an easy room, but it is also the first CTF where we get no help.

A basic introduction to sending and receiving (Both Reverse and Bind) shells when exploiting target machines.