CVE-2025-4382— Grub2: grub allow access to encrypted device through cli once root device is unlocked via tpm

Grub2: grub allow access to encrypted device through cli once root device is unlocked via tpm

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:3.1/AV:P/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

关键功能的认证机制缺失

GNU GRUB 访问控制错误漏洞

GNU GRUB是GNU社区的一款Linux系统引导程序。 GNU GRUB 2存在访问控制错误漏洞，该漏洞源于GRUB在TPM自动解密时未清除内存中的密钥，可能导致物理访问攻击者获取未加密数据。

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