The macOS system must configure SSHD unused connection timeout to 900.

An XCCDF Rule

Description

<VulnDiscussion>If SSHD is enabled, it must be configured with unused connection timeout set to 900. This will set the timeout when there are no open channels within a session. Note: /etc/ssh/sshd_config will be automatically modified to its original state following any update or major upgrade to the operating system. Satisfies: SRG-OS-000163-GPOS-00072,SRG-OS-000279-GPOS-00109</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls>

ID: SV-259447r940963_rule
Severity: Medium
References: CCI-001133 CCI-002361
Updated: 8 months ago

Configure the macOS system to set the SSHD unused connection timeout to 900 with the following command:

include_dir=$(/usr/bin/awk '/^Include/ {print $2}' /etc/ssh/sshd_config | /usr/bin/tr -d '*')

if [[ -z $include_dir ]]; then
  /usr/bin/sed -i.bk "1s/.*/Include \/etc\/ssh\/sshd_config.d\/\*/" /etc/ssh/sshd_configfi

/usr/bin/grep -qxF 'unusedconnectionetimeout 900' "${include_dir}01-mscp-sshd.conf" 2>/dev/null || echo "unusedconnectionetimeout 900" >> "${include_dir}01-mscp-sshd.conf"

for file in $(ls ${include_dir}); do
  if [[ "$file" == "100-macos.conf" ]]; then
      continue
  fi
  if [[ "$file" == "01-mscp-sshd.conf" ]]; then
      break
  fi
  /bin/mv ${include_dir}${file} ${include_dir}20-${file}
done

The macOS system must configure SSHD unused connection timeout to 900.

Description

Remediation - Manual Procedure