CVE Vulnerabilities

CVE-2024-39279

Insufficient Granularity of Access Control

Published: Feb 12, 2025 | Modified: Feb 12, 2025
CVSS 3.x
N/A
Source:
NVD
CVSS 2.x
RedHat/V2
RedHat/V3
6.5 MODERATE
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Ubuntu
MEDIUM

Insufficient granularity of access control in UEFI firmware in some Intel(R) processors may allow a authenticated user to potentially enable denial of service via local access.

Weakness

The product implements access controls via a policy or other feature with the intention to disable or restrict accesses (reads and/or writes) to assets in a system from untrusted agents. However, implemented access controls lack required granularity, which renders the control policy too broad because it allows accesses from unauthorized agents to the security-sensitive assets.

Affected Software

Name Vendor Start Version End Version
Intel-microcode Ubuntu esm-infra-legacy/trusty *
Intel-microcode Ubuntu esm-infra/bionic *
Intel-microcode Ubuntu esm-infra/xenial *
Intel-microcode Ubuntu focal *
Intel-microcode Ubuntu jammy *
Intel-microcode Ubuntu noble *
Intel-microcode Ubuntu oracular *

Extended Description

Integrated circuits and hardware engines can expose accesses to assets (device configuration, keys, etc.) to trusted firmware or a software module (commonly set by BIOS/bootloader). This access is typically access-controlled. Upon a power reset, the hardware or system usually starts with default values in registers, and the trusted firmware (Boot firmware) configures the necessary access-control protection. A common weakness that can exist in such protection schemes is that access controls or policies are not granular enough. This condition allows agents beyond trusted agents to access assets and could lead to a loss of functionality or the ability to set up the device securely. This further results in security risks from leaked, sensitive, key material to modification of device configuration.

Potential Mitigations

References