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The Photon operating system must configure sshd to ignore user-specific known_host files.


Finding ID Version Rule ID IA Controls Severity
V-239164 PHTN-67-000093 SV-239164r675300_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 6.7 Photon OS Security Technical Implementation Guide 2022-06-17


Check Text ( C-42375r675298_chk )
At the command line, execute 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 Text (F-42334r675299_fix)
Open /etc/ssh/sshd_config with a text editor.

Ensure that the "IgnoreUserKnownHosts" line is uncommented and set to the following:

IgnoreUserKnownHosts yes

At the command line, execute the following command:

# service sshd reload