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The OS X system logon window must be configured to prompt for username and password, rather than show a list of users.


Overview

Finding ID Version Rule ID IA Controls Severity
V-76107 AOSX-12-000930 SV-90795r1_rule Medium
Description
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.
STIG Date
Apple OS X 10.12 Security Technical Implementation Guide 2018-01-04

Details

Check Text ( C-75791r1_chk )
To check if the logon window is configured to prompt for user name and password, run the following command:

/usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep SHOWFULLNAME

If there is no result, or "SHOWFULLNAME" is not set to "1", this is a finding.
Fix Text (F-82745r1_fix)
This setting is enforced using the "Login Window Policy" configuration profile.