AlmaLinux OS 9 SSH daemon must not allow rhosts authentication.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-269269	SRG-OS-000480-GPOS-00227	ALMA-09-021360	SV-269269r1050151_rule	2025-02-20	1

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

ℹ️ Check
Verify the SSH daemon does not allow rhosts authentication with the following command: $ sshd -T \| grep ignorerhosts ignorerhosts yes If the "IgnoreRhosts" keyword is set to "no", this is a finding.

✔️ Fix
Configure the SSH daemon to not allow rhosts authentication. Add the following line to "/etc/ssh/sshd_config", or uncomment the line and set the value to "yes": IgnoreRhosts yes Alternatively, add the setting to an include file if the line "Include /etc/ssh/sshd_config.d/*.conf" is found at the top of the "/etc/ssh/sshd_config" file: $ echo 'IgnoreRhosts yes' > /etc/ssh/sshd_config.d/40-rhosts.conf Restart the SSH daemon for the settings to take effect: $ systemctl restart sshd.service

✔️ Fix

Configure the SSH daemon to not allow rhosts authentication. Add the following line to "/etc/ssh/sshd_config", or uncomment the line and set the value to "yes": IgnoreRhosts yes Alternatively, add the setting to an include file if the line "Include /etc/ssh/sshd_config.d/*.conf" is found at the top of the "/etc/ssh/sshd_config" file: $ echo 'IgnoreRhosts yes' > /etc/ssh/sshd_config.d/40-rhosts.conf Restart the SSH daemon for the settings to take effect: $ systemctl restart sshd.service