August 2018
Intermediate to advanced
482 pages
12h 44m
English
Content preview from Practical Linux Security Cookbook - Second Edition
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How to do it...
In this section, we will see how Telnet can cause serious security issues:
- Using Telnet is very easy. Just open a terminal window and type the following command:
telnet <IP Address> <Port>
Here is an example: telnet 192.168.43.100 23
- When Telnet is running on a server, it can be used by attackers to perform the banner grabbing of other services. Let's use it to find the version of SSH running on the server. Type the following command to do this:
As we can see from the previous screenshot, the version of SSH is clearly displayed.
- We can also perform SMTP banner grabbing through Telnet. For this, we run the following command: ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.