The OS X system must automatically remove or disable emergency accounts after the crisis is resolved or within 72 hours.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-75983	AOSX-12-000115	SV-90671r1_rule		Medium

Description
Emergency administrator accounts are privileged accounts established in response to crisis situations where the need for rapid account activation is required. Therefore, emergency account activation may bypass normal account authorization processes. If these accounts are automatically disabled, system maintenance during emergencies may not be possible, thus adversely affecting system availability. Emergency administrator accounts are different from infrequently used accounts (i.e., local logon accounts used by system administrators when network or normal logon/access is not available). Infrequently used accounts also remain available and are not subject to automatic termination dates. However, an emergency administrator account is normally a different account created for use by vendors or system maintainers. To address access requirements, many operating systems can be integrated with enterprise-level authentication/access mechanisms that meet or exceed access control policy requirements.

Description

Emergency administrator accounts are privileged accounts established in response to crisis situations where the need for rapid account activation is required. Therefore, emergency account activation may bypass normal account authorization processes. If these accounts are automatically disabled, system maintenance during emergencies may not be possible, thus adversely affecting system availability. Emergency administrator accounts are different from infrequently used accounts (i.e., local logon accounts used by system administrators when network or normal logon/access is not available). Infrequently used accounts also remain available and are not subject to automatic termination dates. However, an emergency administrator account is normally a different account created for use by vendors or system maintainers. To address access requirements, many operating systems can be integrated with enterprise-level authentication/access mechanisms that meet or exceed access control policy requirements.

STIG	Date
Apple OS X 10.12 Security Technical Implementation Guide	2018-12-24

Details

Check Text ( C-75667r1_chk )
If an emergency account has been created on the system, check the expiration settings of a local account using the following command, replacing "username" with the correct value: /usr/bin/sudo /usr/bin/pwpolicy -u username getaccountpolicies \| tail -n +2 If there is output, verify that the account policies do not restrict the ability to log in after a certain date or amount of time. If they do, this is a finding.

Check Text ( C-75667r1_chk )

If an emergency account has been created on the system, check the expiration settings of a local account using the following command, replacing "username" with the correct value:

/usr/bin/sudo /usr/bin/pwpolicy -u username getaccountpolicies | tail -n +2

If there is output, verify that the account policies do not restrict the ability to log in after a certain date or amount of time.

If they do, this is a finding.

Fix Text (F-82621r1_fix)
To remove all "pwpolicy" settings for an emergency account, run the following command, replacing "username" with the correct value: /usr/bin/sudo /usr/bin/pwpolicy -u username clearaccountpolicies Otherwise, to change the password policy for an emergency account and only remove some policy sections, run the following command to save a copy of the current policy file for the specified username: /usr/bin/sudo /usr/bin/pwpolicy -u username getaccountpolicies \| tail -n +2 > pwpolicy.plist Open the resulting password policy file in a text editor and remove any policyContent sections that would restrict the ability to log in after a certain date or amount of time. To remove the section cleanly, remove the entire text that begins with , contains the like policyContent<'/key>, and ends with . After saving the file and exiting to the command prompt, run the following command to load the new policy file: /usr/bin/sudo /usr/bin/pwpolicy -u username setaccountpolicies pwpolicy.plist

Fix Text (F-82621r1_fix)

To remove all "pwpolicy" settings for an emergency account, run the following command, replacing
"username" with the correct value:

/usr/bin/sudo /usr/bin/pwpolicy -u username clearaccountpolicies

Otherwise, to change the password policy for an emergency account and only remove some policy sections, run the following command to save a copy of the current policy file for the specified username:

/usr/bin/sudo /usr/bin/pwpolicy -u username getaccountpolicies | tail -n +2 > pwpolicy.plist

Open the resulting password policy file in a text editor and remove any policyContent sections that would restrict the ability to log in after a certain date or amount of time.

To remove the section cleanly, remove the entire text that begins with , contains the like policyContent<'/key>, and ends with .

After saving the file and exiting to the command prompt, run the following command to load the new policy file:

/usr/bin/sudo /usr/bin/pwpolicy -u username setaccountpolicies pwpolicy.plist