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5.1.36 Ensure sshd KerberosAuthentication is disabled

Information

The operating system's SSH daemon must not allow Kerberos authentication, except to fulfill documented and validated mission requirements.

Configuring these settings for the SSH daemon provides additional assurance that remote logon via SSH will not use unused methods of authentication, even in the event of misconfiguration elsewhere.

Solution

Configure the SSH daemon to not allow Kerberos authentication.

Edit the /etc/ssh/sshd_config file to set the KerberosAuthentication parameter to no above any Include and Match entries as follows:

KerberosAuthentication no

Note: First occurrence of a option takes precedence, Match set statements withstanding. If Include locations are enabled, used, and order of precedence is understood in your environment, the entry may be created in a file in Include location.

The SSH daemon must be restarted for the changes to take effect. To restart the SSH daemon, run the following command:

# systemctl reload-or-restart sshd.service

See Also

https://workbench.cisecurity.org/benchmarks/19886

Item Details

Category: CONFIGURATION MANAGEMENT

References: 800-53|CM-6, 800-53|CM-6b., 800-53|CM-7, CAT|II, CSCv7|9.2, Rule-ID|SV-230291r952105_rule, STIG-ID|RHEL-08-010521, Vuln-ID|V-230291

Plugin: Unix

Control ID: ecf092cd17aced073ea42bd9569c9ff5028c6b529b181cd907bd6fbb802a616e