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The Photon operating system must configure Secure Shell (SSH) to ignore user-specific known_host files.


Finding ID Version Rule ID IA Controls Severity
V-258881 PHTN-40-000218 SV-258881r935567_rule Medium
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.
VMware vSphere 8.0 vCenter Appliance Photon OS 4.0 Security Technical Implementation Guide 2023-10-29


Check Text ( C-62621r933702_chk )
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 Text (F-62530r933703_fix)
Navigate to and open:


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