How do I improve the security of Copssh ?

Some recommendations (not all of them can be applicable in your case, no sorting by importance):


 

Recommendation Benefits/Side effects How
Change port 22 to something non-standard Reduces your vulnerability surface dramatically by taking a well-known parameter out of equation, not applicable if you have a general purpose server. Security by obscurity ? Yes. However, there are many script kiddies out there bombing port 22 wherever they find. Conf.file etc\sshd_config: port
Reduce the maximum number of concurrent unauthenticated con-
nections
Reduces your vulnerability surface by allowing a smaller number of potentialy dangerous attacks simultaneously. Conf.file etc\sshd_config: MaxStartups (default 10)
Turn off authentication by password. Use public key authentication instead. Eliminates the most widely used technique of potential attacks: cracking passwords.

Conf.file etc\sshd_config: PasswordAuthentication no

PubkeyAuthentication
(default yes)

Restrict access by host Use your firewall setting to limit hosts authorized for access

 

Restrict access by user/group  

Conf.file etc\sshd_config:

AllowUsers
AllowGroups