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The Photon operating system must be configured to protect the SSH public host key from unauthorized modification.


Overview

Finding ID Version Rule ID IA Controls Severity
V-239186 PHTN-67-000115 SV-239186r675366_rule Medium
Description
If a public host key file is modified by an unauthorized user, the SSH service may be compromised.
STIG Date
VMware vSphere 6.7 Photon OS Security Technical Implementation Guide 2022-06-17

Details

Check Text ( C-42397r675364_chk )
At the command line, execute the following command:

# stat -c "%n permissions are %a and owned by %U:%G" /etc/ssh/*key.pub

Expected result:

/etc/ssh/ssh_host_dsa_key.pub permissions are 644 and owned by root:root
/etc/ssh/ssh_host_ecdsa_key.pub permissions are 644 and owned by root:root
/etc/ssh/ssh_host_ed25519_key.pub permissions are 644 and owned by root:root
/etc/ssh/ssh_host_rsa_key.pub permissions are 644 and owned by root:root

If the output does not match the expected result, this is a finding.
Fix Text (F-42356r675365_fix)
At the command line, execute the following commands for each returned file:

# chmod 644
# chown root:root