STIGQter: STIG Summary: Oracle Linux 9 Security Technical Implementation Guide Version: 1 Release: 6 Benchmark Date: 01 Jul 2026:

OL 9 SSH private host key files must have mode 0600 or less permissive.

DISA Rule

SV-271771r1208733_rule

Vulnerability Number

V-271771

Group Title

SRG-OS-000480-GPOS-00227

Rule Version

OL09-00-002502

Severity

CAT II

CCI(s)

• CCI-000366 - Implement the security configuration settings.

Weight

10

Fix Recommendation

Configure the mode of SSH private host key files under "/etc/ssh" to "0600" with the following command:

$ sudo chmod 0600 /etc/ssh/ssh_host*key

Restart the SSH daemon for the changes to take effect:

$ sudo systemctl restart sshd.service

Check Contents

Verify that OL 9 SSH private host key files have a mode of "0600" or less permissive with the following command:

$ ls -l /etc/ssh/*_key
600 /etc/ssh/ssh_host_dsa_key
600 /etc/ssh/ssh_host_ecdsa_key
600 /etc/ssh/ssh_host_ed25519_key
600 /etc/ssh/ssh_host_rsa_key

If any private host key file has a mode more permissive than "0600", this is a finding.

Vulnerability Number

V-271771

Documentable

False

Rule Version

OL09-00-002502

Severity Override Guidance

Verify that OL 9 SSH private host key files have a mode of "0600" or less permissive with the following command:

$ ls -l /etc/ssh/*_key
600 /etc/ssh/ssh_host_dsa_key
600 /etc/ssh/ssh_host_ecdsa_key
600 /etc/ssh/ssh_host_ed25519_key
600 /etc/ssh/ssh_host_rsa_key

If any private host key file has a mode more permissive than "0600", this is a finding.

Check Content Reference

M

Target Key

5680