Missing Authentication for Critical Function Affecting grub2 package, versions *


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.03% (7th percentile)

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  • Snyk IDSNYK-DEBIAN12-GRUB2-10114839
  • published11 May 2025
  • disclosed9 May 2025

Introduced: 9 May 2025

NewCVE-2025-4382  (opens in a new tab)
CWE-306  (opens in a new tab)

How to fix?

There is no fixed version for Debian:12 grub2.

NVD Description

Note: Versions mentioned in the description apply only to the upstream grub2 package and not the grub2 package as distributed by Debian. See How to fix? for Debian:12 relevant fixed versions and status.

A flaw was found in systems utilizing LUKS-encrypted disks with GRUB configured for TPM-based auto-decryption. When GRUB is set to automatically decrypt disks using keys stored in the TPM, it reads the decryption key into system memory. If an attacker with physical access can corrupt the underlying filesystem superblock, GRUB will fail to locate a valid filesystem and enter rescue mode. At this point, the disk is already decrypted, and the decryption key remains loaded in system memory. This scenario may allow an attacker with physical access to access the unencrypted data without any further authentication, thereby compromising data confidentiality. Furthermore, the ability to force this state through filesystem corruption also presents a data integrity concern.

CVSS Base Scores

version 3.1