The Photon operating system must configure sshd to ignore user-specific "known_host" files.
Severity | Group ID | Group Title | Version | Rule ID | Date | STIG Version |
|---|---|---|---|---|---|---|
| medium | V-256556 | SRG-OS-000480-GPOS-00227 | PHTN-30-000087 | SV-256556r991589_rule | 2024-12-16 | 1 |
| Description |
|---|
| Secure Shell (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 that must also be ignored while disabling host-based authentication generally. |
| ℹ️ Check |
|---|
| At the command line, run the following command: # sshd -T|&grep -i IgnoreUserKnownHosts Expected result: IgnoreUserKnownHosts yes If the output does not match the expected result, 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 |