The TOSS SSH public host key files must have mode 0644 or less permissive.
An XCCDF Rule
Description
If a public host key file is modified by an unauthorized user, the SSH service may be compromised.
- ID
- SV-253108r991589_rule
- Version
- TOSS-04-040670
- Severity
- Medium
- References
- Updated
Remediation Templates
A Manual Procedure
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