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Michael Chang
13febd78db
The GRUB may use TPM to verify the integrity of boot components and the result can determine whether a previously sealed key can be released. If everything checks out, showing nothing has been tampered with, the key is released and GRUB unlocks the encrypted root partition for the next stage of booting. However, the liberal Command Line Interface (CLI) can be misused by anyone in this case to access files in the encrypted partition one way or another. Despite efforts to keep the CLI secure by preventing utility command output from leaking file content, many techniques in the wild could still be used to exploit the CLI, enabling attacks or learning methods to attack. It's nearly impossible to account for all scenarios where a hack could be applied. Therefore, to mitigate potential misuse of the CLI after the root device has been successfully unlocked via TPM, the user should be required to authenticate using the LUKS password. This added layer of security ensures that only authorized users can access the CLI reducing the risk of exploitation or unauthorized access to the encrypted partition. Fixes: CVE-2024-49504 Signed-off-by: Michael Chang <mchang@suse.com> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
