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Did you ever wondered, how many sites are hosted on linux? No? Then let me make you aware, that more than 70% of websites you see on internet are hosted on linux! Even google.com is hosted on Linux. You must be wondering, why am I talking about linux? The reason is simple, only sites hosted on linux can be attacked using ssh (secure shell) attack. In SSH attack, most common type of attack is SSH brute force attack. In this type of attack hacker/attackers tries to break your ssh password using all possible combinations (read about brute force from wikipedia for more detail on brute force). When you see SSH login logs, you will notice there are numerous failed login attempts.
SSH attack involves scanning ip ranges for default SSH port, 22, and trying to login to a machine which has open or insecure port, using predetermined list of commonly used usernames and passwords. If hacker can crack into ssh, then he can elevate himself to root! So, it is really important to prevent SSH attack. In this tutorial, I'll share most common and effective measures you need to take to prevent this type of attack.
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