Thursday, February 1, 2018

Port Scanning : First Step Of Exploitation

Port Scanning

First of all If you don’t know about ports then refer to A Beginner’s Guide To Ports.
So every program on a computer which is connected to Internet receives data from its respective port. Hence if Computer is a house then a port is a door and we know opened doors are dangerous as attackers can directly enter into our house. So as a hacker we want to attack the house (computer) right? Yep that’s why we start with checking doors. So Port Scanning is the process of checking which ports are open the target machine. The program which performs Port Scanning is called a Port Scanner and it tries to connect to all ports one by one and tells us which ports are open.

What if a port is open?

That’s a good question that should be answered and will be answered.
Well every thing has weaknesses and programs have too, called vulnerability. Hackers can identify them and can build exploits. Exploits are small piece of code which allow hackers to take advantage of the vulnerability. So if you have a program installed on your computer and a hacker finds that it is vulnerable then he can send exploit to the port linked with that program and hence can get into your system.
So do you need to learn how to write exploits? No man at least not now. There are already many Exploits already written by hackers that you can use in your hack.

How To Perform A Port Scan?

Nmap is the best port scanner, Nmap can do a lot of other things too.
Well if you are a beginner I will suggest you to use ZenMap which is the front end GUI of Nmap.
You can download it from here
So lets perform a port scan with Nmap.
Note: These directions are for Linux Users and we strongly recommend you to use Linux.
1. Open Terminal
2. Type “nmap Target_IP_Address_Here” (without ” quotes and you can also put Domain in place of IP)
3. Now Nmap will scan the most common ports if they are open and you will see a output like this

nmap port scan

Thats it! Yes sir that’s it! We did port scanning and now we have a list of open ports and therefore we know what kind of services are running on that server.
So you must be thinking oh wow a lot of open doors lets attack! But we should clear our basics first right? Yeah good boy There are many kind of port scans and a great explanation about the basic ones is here.
 

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