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The Photon operating system must configure sshd to disconnect idle SSH sessions.


Finding ID Version Rule ID IA Controls Severity
V-239111 PHTN-67-000039 SV-239111r675141_rule Medium
Terminating an idle session within a short time period reduces the window of opportunity for unauthorized personnel to take control of a management session enabled on the console or console port that has been left unattended.
VMware vSphere 6.7 Photon OS Security Technical Implementation Guide 2022-06-17


Check Text ( C-42322r675139_chk )
At the command line, execute the following command:

# sshd -T|&grep -i ClientAliveCountMax

Expected result:

ClientAliveCountMax 0

If the output does not match the expected result, this is a finding.
Fix Text (F-42281r675140_fix)
Open /etc/ssh/sshd_config with a text editor.

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

ClientAliveCountMax 0

At the command line, execute the following command:

# service sshd reload