1.5.3 Ensure authentication required for single user mode - /usr/lib/systemd/system/emergency.service

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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

See Also

https://workbench.cisecurity.org/files/3549