RHEL 9 SSH daemon must not allow rhosts authentication.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-258005	RHEL-09-255145	SV-258005r926002_rule		Medium

Description
SSH trust relationships mean a compromise on one host can allow an attacker to move trivially to other hosts.

STIG	Date
Red Hat Enterprise Linux 9 Security Technical Implementation Guide	2023-12-01

Details

Check Text ( C-61746r926000_chk )
Verify the SSH daemon does not allow rhosts authentication with the following command: $ sudo grep -ir ignorerhosts /etc/ssh/sshd_config /etc/ssh/sshd_config.d/* IgnoreRhosts yes If the value is returned as "no", the returned line is commented out, or no output is returned, this is a finding.

Fix Text (F-61670r926001_fix)
Configure the SSH daemon to not allow rhosts authentication. Add the following line in "/etc/ssh/sshd_config", or uncomment the line and set the value to "yes": IgnoreRhosts yes The SSH service must be restarted for changes to take effect: $ sudo systemctl restart sshd.service