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RHEL-10-700590 RHEL 10 must be configured so that Secure Shell (SSH) server configuration files' permissions are not modified.

DISA STIG library V1R3
All changes in this version
first version loaded CAT II

Maps to AC-3 via CCI-000213

Title

RHEL 10 must be configured so that Secure Shell (SSH) server configuration files' permissions are not modified.

Control

Verify RHEL 10 is configured so that SSH server configuration files' permissions are not modified. Check the permissions of the "/etc/ssh/sshd_config" file with the following command: $ sudo rpm --verify openssh-server | awk '! ($2 == "c" && $1 ~ /^.\..\.\.\.\..\./) {print $0}' If the command returns any output, 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. OpenSSH uses the first occurrence of a keyword it sees, and drop-in files are read in lexicographical order at the start of the configuration. Red Hat recommends using drop-in files rather than changing base configuration files.

Related controls

CCI-000213

Fix

Configure RHEL 10 so that SSH server configuration files' permissions are not modified. Run the following commands to restore the correct permissions of OpenSSH server configuration files: $ sudo rpm --setugids openssh-server $ sudo rpm --setperms openssh-server