The TOSS SSH private host key files must have mode 0600 or less permissive.
An XCCDF Rule
Description
If an unauthorized user obtains the private SSH host key file, the host could be impersonated.
- ID
- SV-253107r991589_rule
- Version
- TOSS-04-040660
- Severity
- Medium
- References
- Updated
Remediation Templates
A Manual Procedure
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
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