Vulnerability identifier: #VU64065

Vulnerability risk: Low

CVSSv3.1: 5.6 [CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-28736

CWE-ID: CWE-416

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 a use-after-free error in the grub_cmd_chainloader() function in chainloader command. A local privileged user can trigger a use-after-free error 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
http://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.