Information
Single user mode (rescue mode) is used for recovery when the system detects an issue during boot or by manual selection from the bootloader.
Rationale:
Requiring authentication in single user mode (rescue mode) prevents an unauthorized user from rebooting the system into single user to gain root privileges without credentials.
Solution
Edit /usr/lib/systemd/system/rescue.service and add/modify the following line:
ExecStart=-/usr/lib/systemd/systemd-sulogin-shell rescue
Edit /usr/lib/systemd/system/emergency.service and add/modify the following line:
ExecStart=-/usr/lib/systemd/systemd-sulogin-shell emergency
Item Details
Category: CONFIGURATION MANAGEMENT, SYSTEM AND SERVICES ACQUISITION
References: 800-53|CM-1, 800-53|CM-2, 800-53|CM-6, 800-53|CM-7, 800-53|CM-7(1), 800-53|CM-9, 800-53|SA-3, 800-53|SA-8, 800-53|SA-10, CSCv7|5.1
Control ID: 1a8bcc26369fe677d84f0f09611d9021d857b1f950b28757cdf4846ded71c059