The Photon operating system must configure Secure Shell (SSH) to ignore user-specific known_host files.
Severity | Group ID | Group Title | Version | Rule ID | Date | STIG Version |
|---|---|---|---|---|---|---|
| medium | V-258881 | SRG-OS-000480-GPOS-00227 | PHTN-40-000218 | SV-258881r991589_rule | 2024-07-11 | 2 |
| Description |
|---|
| SSH trust relationships enable trivial lateral spread after a host compromise and therefore must be explicitly disabled. Individual users can have a local list of trusted remote machines, which must also be ignored while disabling host-based authentication generally. |
| ℹ️ Check |
|---|
| At the command line, run the following command to verify the running configuration of sshd: # sshd -T|&grep -i IgnoreUserKnownHosts Expected result: ignoreuserknownhosts yes If "IgnoreUserKnownHosts" is not set to "yes", this is a finding. |
| ✔️ Fix |
|---|
| Navigate to and open: /etc/ssh/sshd_config Ensure the "IgnoreUserKnownHosts" line is uncommented and set to the following: IgnoreUserKnownHosts yes At the command line, run the following command: # systemctl restart sshd.service |