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The Photon operating system must configure sshd to disconnect idle Secure Shell (SSH) sessions.


Overview

Finding ID Version Rule ID IA Controls Severity
V-256513 PHTN-30-000037 SV-256513r887213_rule Medium
Description
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 a console or console port that has been left unattended.
STIG Date
VMware vSphere 7.0 vCenter Appliance Photon OS Security Technical Implementation Guide 2023-12-01

Details

Check Text ( C-60188r887211_chk )
At the command line, run the following command:

# sshd -T|&grep -i ClientAliveInterval

Expected result:

ClientAliveInterval 900

If the output does not match the expected result, this is a finding.
Fix Text (F-60131r887212_fix)
Navigate to and open:

/etc/ssh/sshd_config

Ensure the "ClientAliveInterval" line is uncommented and set to the following:

ClientAliveInterval 900

At the command line, run the following command:

# systemctl restart sshd.service