Title

The macOS system logon window must be configured to prompt for username and password. (Cat II impact)

Discussion

The logon window must be configured to prompt all users for both a username and a password. By default, the system displays a list of known users at the logon screen. This gives an advantage to an attacker with physical access to the system, as the attacker would only have to guess the password for one of the listed accounts.

Check Content

Verify the macOS system is configured to prompt for username and password at the logon window with the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep "SHOWFULLNAME" SHOWFULLNAME = 1; If "SHOWFULLNAME" is not set to "1", this is a finding.

Fix Text

Configure the macOS system to prompt for username and password at the logon window by installing the "Login Window Policy" configuration profile.

Additional Identifiers

Rule ID: SV-257244r905365_rule

Vulnerability ID: V-257244

Group Title: SRG-OS-000480-GPOS-00229

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.