It is easy to update your SSH via yum. To do so, simply SSH into your linux server. Once logged in, type the the following;

#yum update openssh

This will update the openssh process, openssh-clients and openssh-server.

To verify what version of openssh you are running, you can type the following commend;

#ssh -V

Your server will then reply back with the version;

[root@XXXXXXX ~]# ssh -V
OpenSSH_4.3p2, OpenSSL 0.9.8e-fips-rhel5 01 Jul 2008

The default port for the SSH user is port 22. For a hacker to determine ssh is running on your machine, he’ll most likely scan port 22 to determine this. So, we better change our default port number to some other port. For instance, you want to run the ssh service on port 99 instead of 22

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