STIGQter: STIG Summary: Apple OS X 10.15 (Catalina) Security Technical Implementation Guide Version: 1 Release: 4 Benchmark Date: 23 Apr 2021:

The macOS system must be configured with the SSH daemon ClientAliveCountMax option set to 0.

DISA Rule

SV-225140r610901_rule

Vulnerability Number

V-225140

Group Title

SRG-OS-000163-GPOS-00072

Rule Version

AOSX-15-000052

Severity

CAT II

CCI(s)

• CCI-001133 - The information system terminates the network connection associated with a communications session at the end of the session or after an organization-defined time period of inactivity.

Weight

10

Fix Recommendation

To ensure that the SSH idle timeout occurs precisely when the "ClientAliveCountMax" is set, run the following command:

/usr/bin/sudo /usr/bin/sed -i.bak 's/.*ClientAliveCountMax.*/ClientAliveCountMax 0/' /etc/ssh/sshd_config

Check Contents

The SSH daemon "ClientAliveCountMax" option must be set correctly. To verify the SSH idle timeout will occur when the "ClientAliveCountMax" is set, run the following command:

/usr/bin/sudo /usr/bin/grep ^ClientAliveCountMax /etc/ssh/sshd_config

If the setting is not "ClientAliveCountMax 0", this is a finding.

Vulnerability Number

V-225140

Documentable

False

Rule Version

AOSX-15-000052

Severity Override Guidance

The SSH daemon "ClientAliveCountMax" option must be set correctly. To verify the SSH idle timeout will occur when the "ClientAliveCountMax" is set, run the following command:

/usr/bin/sudo /usr/bin/grep ^ClientAliveCountMax /etc/ssh/sshd_config

If the setting is not "ClientAliveCountMax 0", this is a finding.

Check Content Reference

M

Target Key

4212

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