Debian update for grub2

Published: 2022-11-16

Risk	Low
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2022-2601 CVE-2022-3775
CWE-ID	CWE-787
Exploitation vector	Local
Public exploit	N/A
Vulnerable software Subscribe	Debian Linux Operating systems & Components / Operating system grub2 (Debian package) Operating systems & Components / Operating system package or component
Vendor	Debian

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Out-of-bounds write

EUVDB-ID: #VU69394

Risk: Low

CVSSv3.1: 6.6 [CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-2601

CWE-ID: CWE-787 - Out-of-bounds write

Exploit availability: No

Description

The vulnerability allows an attacker to bypass implemented security restrictions.

The vulnerability exists due to a boundary error within the grub_font_construct_glyph() function when handling pf2 font. An attacker with physical access to the affected system can trigger an out-of-bounds write and bypass secure boot restrictions.

Mitigation

Update grub2 package to version 2.06-3~deb11u4.

Vulnerable software versions

Debian Linux: All versions

grub2 (Debian package): before 2.06-3~deb11u4

External links

http://www.debian.org/security/2022/dsa-5280

Q & A

Can this vulnerability be exploited remotely?

No. The attacker should have physical access to the system in order to successfully exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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

2) Out-of-bounds write

EUVDB-ID: #VU69395