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The macOS system must configure SSH ServerAliveInterval option set to 900.

An XCCDF Rule

Description

SSH must be configured with an Active Server Alive Maximum Count set to 900. Setting the Active Server Alive Maximum Count to 900 will log users out after a 900-second interval of inactivity. Note: /etc/ssh/ssh_config will be automatically modified to its original state following any update or major upgrade to the operating system.

ID
SV-259445r970703_rule
Version
APPL-14-000110
Severity
Medium
References
Updated

Remediation Templates

A Manual Procedure

Configure the macOS system to set the SSH ServerAliveInterval option set to 900 with the following command:

for u in $(/usr/bin/dscl . -list /Users UniqueID | /usr/bin/awk '$2 > 500 {print $1}'); do
  config=$(/usr/bin/sudo -u $u /usr/bin/ssh -Gv . 2>&1 | /usr/bin/awk '/Reading configuration data/ {print $NF}'| /usr/bin/tr -d '\r')
  configarray=( ${(f)config} )
  for c in $configarray; do