#VU64064 Insufficient verification of data authenticity in grub - CVE-2022-28735

Vulnerability identifier: #VU64064

Vulnerability risk: Low

CVSSv4.0: 5.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2022-28735

CWE-ID: CWE-345

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
grub
Universal components / Libraries / Libraries used by multiple products

Vendor: GNU

Description

The vulnerability allows a local user to bypass implemented security restrictions.

The vulnerability exists due to shim_lock verifier allows non-kernel files to be loaded on shim-powered secure boot systems. A local privileged user can load unverified modules into GRUB and bypass secure boot protection mechanism.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

grub: 1.99 - 2.06

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External links
https://lists.gnu.org/archive/html/grub-devel/2022-06/msg00035.html

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.