GRUB2 shim_lock: Load non-kernel files on SecureBoot
CVE-2022-28735 Published on July 20, 2023

The GRUB2's shim_lock verifier allows non-kernel files to be loaded on shim-powered secure boot systems. Allowing such files to be loaded may lead to unverified code and modules to be loaded in GRUB2 breaking the secure boot trust-chain.

NVD

Vulnerability Analysis

CVE-2022-28735 can be exploited with local system access, and requires user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.

Attack Vector:
LOCAL
Attack Complexity:
LOW
Privileges Required:
HIGH
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
HIGH
Availability Impact:
HIGH

Products Associated with CVE-2022-28735

stack.watch emails you whenever new vulnerabilities are published in GNU Grub2 or Canonical Ubuntu Linux. Just hit a watch button to start following.

GNU Grub2
 
Canonical Ubuntu Linux
 

Affected Versions

GNU Project GNU GRUB:

Exploit Probability

EPSS
0.02%
Percentile
4.46%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.