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