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RHEL-09-255105 RHEL 9 SSH server configuration file must be group-owned by root.

DISA STIG library V2R10
All changes in this version
first version loaded CAT II

Maps to CM-6 via CCI-000366

Title

RHEL 9 SSH server configuration file must be group-owned by root.

Control

Verify the group ownership of the "/etc/ssh/sshd_config" file and the contents of "/etc/ssh/sshd_config.d" with the following command: $ sudo find /etc/ssh/sshd_config /etc/ssh/sshd_config.d -exec stat -c "%G %n" {} \; root /etc/ssh/sshd_config root /etc/ssh/sshd_config.d root /etc/ssh/sshd_config.d/50-cloud-init.conf root /etc/ssh/sshd_config.d/50-redhat.conf If the "/etc/ssh/sshd_config" file or "/etc/ssh/sshd_config.d" or any files in the sshd_config.d directory do not have a group owner of "root", this is a finding.

Discussion

Service configuration files enable or disable features of their respective services, which if configured incorrectly, can lead to insecure and vulnerable configurations. Therefore, service configuration files must be owned by the correct group to prevent unauthorized changes.

Related controls

CCI-000366

Fix

Configure the "/etc/ssh/sshd_config" file and the contents of "/etc/ssh/sshd_config.d" to be group-owned by root with the following command: $ sudo chgrp root /etc/ssh/sshd_config /etc/ssh/sshd_config.d