SUSE operating systems with Unified Extensible Firmware Interface (UEFI) implemented must require authentication upon booting into single-user mode and maintenance.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-77145	SLES-12-010440	SV-91841r3_rule		Medium

Description
If the system allows a user to boot into single-user or maintenance mode without authentication, any user that invokes single-user or maintenance mode is granted privileged access to all system information. If the system is running in EFI mode, SLES 12 by default will use GRUB 2 EFI as the boot loader.

STIG	Date
SLES 12 Security Technical Implementation Guide	2018-09-27

Details

Check Text ( C-76755r2_chk )
Verify that the SUSE operating system has set an encrypted root password. Note: If the system does not use Unified Extensible Firmware Interface (UEFI) this requirement is Not Applicable. Check that the encrypted password is set for root with the following command: # sudo cat /boot/efi/EFI/sles12/grub.cfg \| grep -i password password_pbkdf2 root grub.pbkdf2.sha512.10000.VeryLongString If the root password entry does not begin with "password_pbkdf2", this is a finding.

Check Text ( C-76755r2_chk )

Verify that the SUSE operating system has set an encrypted root password.

Note: If the system does not use Unified Extensible Firmware Interface (UEFI) this requirement is Not Applicable.

Check that the encrypted password is set for root with the following command:

# sudo cat /boot/efi/EFI/sles12/grub.cfg | grep -i password

password_pbkdf2 root grub.pbkdf2.sha512.10000.VeryLongString

If the root password entry does not begin with "password_pbkdf2", this is a finding.

Fix Text (F-83841r3_fix)
Note: If the system does not use UEFI, this requirement is Not Applicable. Configure the SUSE operating system to encrypt the boot password. Generate an encrypted (GRUB 2) password for root with the following command: # sudo grub2-mkpasswd-pbkdf2 Enter Password: Reenter Password: PBKDF2 hash of your password is grub.pbkdf2.sha512.10000.MFU48934NJD84NF8NSD39993JDHF84NG Using the hash from the output, modify the "/etc/grub.d/40_custom" file with the following command to add a boot password for the root entry: # cat << EOF set superusers="root" password_pbkdf2 root grub.pbkdf2.sha512.VeryLongString EOF Generate an updated "grub.conf" file with the new password using the following commands: # sudo grub2-mkconfig --output=/tmp/grub2.cfg # sudo mv /tmp/grub2.cfg /boot/efi/EFI/sles12/grub.cfg

Fix Text (F-83841r3_fix)

Note: If the system does not use UEFI, this requirement is Not Applicable.

Configure the SUSE operating system to encrypt the boot password.

Generate an encrypted (GRUB 2) password for root with the following command:

# sudo grub2-mkpasswd-pbkdf2
Enter Password:
Reenter Password:
PBKDF2 hash of your password is grub.pbkdf2.sha512.10000.MFU48934NJD84NF8NSD39993JDHF84NG

Using the hash from the output, modify the "/etc/grub.d/40_custom" file with the following command to add a boot password for the root entry:

# cat << EOF
set superusers="root"
password_pbkdf2 root grub.pbkdf2.sha512.VeryLongString
EOF

Generate an updated "grub.conf" file with the new password using the following commands:

# sudo grub2-mkconfig --output=/tmp/grub2.cfg
# sudo mv /tmp/grub2.cfg /boot/efi/EFI/sles12/grub.cfg