Vulnerability Discussion

To mitigate the risk of unauthorized access to sensitive information by entities that have been issued certificates by DoW-approved PKIs, all DoW systems (e.g., web servers and web portals) must be properly configured to incorporate access control methods that do not rely solely on the possession of a certificate for access.

Successful authentication must not automatically give an entity access to an asset or security boundary. Authorization procedures and controls must be implemented to ensure each authenticated entity also has a validated and current authorization. Authorization is the process of determining whether an entity, once authenticated, is permitted to access a specific asset. Information systems use access control policies and enforcement mechanisms to implement this requirement.

Password protection on the boot loader configuration ensures users with physical access cannot trivially alter important bootloader settings. These include which kernel to use and whether to enter single-user mode.

Check

Verify that RHEL 10 requires a password for the GRUB 2 bootloader to prevent unauthorized modifications to boot parameters.

Check the unified configuration file where the GRUB 2 password is stored:

# sudo grep -iw "GRUB2_PASSWORD" /boot/grub2/user.cfg
GRUB2_PASSWORD=grub.pbkdf2.sha512.[password_hash]

If the "GRUB2_PASSWORD" entry does not exist, is commented out, or if the hash does not begin with "grub.pbkdf2.sha512", this is a finding.

Fix

Configure RHEL 10 to require a grub bootloader password for the grub superuser account.

Generate an encrypted grub2 password for the grub superuser account with the following command:

$ sudo grub2-setpassword
Enter password:
Confirm password: