STIGQter: STIG Summary: Red Hat Enterprise Linux 8 Security Technical Implementation Guide Version: 1 Release: 2 Benchmark Date: 23 Apr 2021:

The RHEL 8 SSH public host key files must have mode 0644 or less permissive.

DISA Rule

SV-230286r627750_rule

Vulnerability Number

V-230286

Group Title

SRG-OS-000480-GPOS-00227

Rule Version

RHEL-08-010480

Severity

CAT II

CCI(s)

• CCI-000366 - The organization implements the security configuration settings.

Weight

10

Fix Recommendation

Change the mode of public host key files under "/etc/ssh" to "0644" with the following command:

$ sudo chmod 0644 /etc/ssh/*key.pub

The SSH daemon must be restarted for the changes to take effect. To restart the SSH daemon, run the following command:

$ sudo systemctl restart sshd.service

Check Contents

Verify the SSH public host key files have mode "0644" or less permissive with the following command:

$ sudo ls -l /etc/ssh/*.pub

-rw-r--r-- 1 root root 618 Nov 28 06:43 ssh_host_dsa_key.pub
-rw-r--r-- 1 root root 347 Nov 28 06:43 ssh_host_key.pub
-rw-r--r-- 1 root root 238 Nov 28 06:43 ssh_host_rsa_key.pub

If any key.pub file has a mode more permissive than "0644", this is a finding.

Note: SSH public key files may be found in other directories on the system depending on the installation.

Vulnerability Number

V-230286

Documentable

False

Rule Version

RHEL-08-010480

Severity Override Guidance

Verify the SSH public host key files have mode "0644" or less permissive with the following command:

$ sudo ls -l /etc/ssh/*.pub

-rw-r--r-- 1 root root 618 Nov 28 06:43 ssh_host_dsa_key.pub
-rw-r--r-- 1 root root 347 Nov 28 06:43 ssh_host_key.pub
-rw-r--r-- 1 root root 238 Nov 28 06:43 ssh_host_rsa_key.pub

If any key.pub file has a mode more permissive than "0644", this is a finding.

Note: SSH public key files may be found in other directories on the system depending on the installation.

Check Content Reference

M

Target Key

2921

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