STIGQter: STIG Summary: Canonical Ubuntu 18.04 LTS Security Technical Implementation Guide Version: 2 Release: 3 Benchmark Date: 23 Apr 2021:

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

DISA Rule

SV-219148r610963_rule

Vulnerability Number

V-219148

Group Title

SRG-OS-000080-GPOS-00048

Rule Version

UBTU-18-010001

Severity

CAT I

CCI(s)

• CCI-000213 - The information system enforces approved authorizations for logical access to information and system resources in accordance with applicable access control policies.

Weight

10

Fix Recommendation

Configure the system to require a password for authentication upon booting into single-user and maintenance modes.

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

# grub-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:

# sudo sed -i '$i set superusers=\"root\"\npassword_pbkdf2 root <hash>' /etc/grub.d/40_custom

where <hash> is the hash generated by grub-mkpasswd-pbdkf2 command.

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

# update-grub

Check Contents

Verify that an encrypted root password is set. This is only applicable on Ubuntu operating systems that use UEFI.

Run the following command to verify the encrypted password is set:

# grep –i password /boot/efi/EFI/grub.cfg
password_pbkdf2 root grub.pbkdf2.sha512.10000.VeryLongString

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

Vulnerability Number

V-219148

Documentable

False

Rule Version

UBTU-18-010001

Severity Override Guidance

Verify that an encrypted root password is set. This is only applicable on Ubuntu operating systems that use UEFI.

Run the following command to verify the encrypted password is set:

# grep –i password /boot/efi/EFI/grub.cfg
password_pbkdf2 root grub.pbkdf2.sha512.10000.VeryLongString

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

Check Content Reference

M

Target Key

4055

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