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XCCDF
Guide to the Secure Configuration of Ubuntu 18.04
Services
SSH Server
Configure OpenSSH Server if Necessary
Ensure SSH MaxStartups is configured
Ensure SSH MaxStartups is configured
An XCCDF Rule
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Ensure SSH MaxStartups is configured
Medium Severity
The MaxStartups parameter specifies the maximum number of concurrent unauthenticated connections to the SSH daemon. Additional connections will be dropped until authentication succeeds or the LoginGraceTime expires for a connection. To confgure MaxStartups, you should add or correct the following line in the
/etc/ssh/sshd_config
file:
MaxStartups
CIS recommends a MaxStartups value of '10:30:60', or more restrictive where dictated by site policy.