Amazon Linux 2 : grub2 (ALAS-2022-1787)

low Nessus Plugin ID 160263


The remote Amazon Linux 2 host is missing a security update.


The version of grub2 installed on the remote host is prior to 2.06-9. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2022-1787 advisory.

- A flaw in grub2 was found where its configuration file, known as grub.cfg, is being created with the wrong permission set allowing non privileged users to read its content. This represents a low severity confidentiality issue, as those users can eventually read any encrypted passwords present in grub.cfg.
This flaw affects grub2 2.06 and previous versions. This issue has been fixed in grub upstream but no version with the fix is currently released. (CVE-2021-3981)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.


Run 'yum update grub2' to update your system.

See Also

Plugin Details

Severity: Low

ID: 160263

File Name: al2_ALAS-2022-1787.nasl

Version: 1.2

Type: local

Agent: unix

Published: 4/27/2022

Updated: 4/27/2022

Supported Sensors: Frictionless Assessment Agent, Frictionless Assessment AWS, Nessus Agent

Risk Information


Risk Factor: Low

Score: 1.4


Risk Factor: Low

Base Score: 2.1

Temporal Score: 1.6

Vector: AV:L/AC:L/Au:N/C:P/I:N/A:N

Temporal Vector: E:U/RL:OF/RC:C

CVSS Score Source: CVE-2021-3981


Risk Factor: Low

Base Score: 3.3

Temporal Score: 2.9

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Temporal Vector: E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:grub2, p-cpe:/a:amazon:linux:grub2-common, p-cpe:/a:amazon:linux:grub2-debuginfo, p-cpe:/a:amazon:linux:grub2-efi-aa64, p-cpe:/a:amazon:linux:grub2-efi-aa64-cdboot, p-cpe:/a:amazon:linux:grub2-efi-aa64-ec2, p-cpe:/a:amazon:linux:grub2-efi-aa64-modules, p-cpe:/a:amazon:linux:grub2-efi-x64, p-cpe:/a:amazon:linux:grub2-efi-x64-cdboot, p-cpe:/a:amazon:linux:grub2-efi-x64-ec2, p-cpe:/a:amazon:linux:grub2-efi-x64-modules, p-cpe:/a:amazon:linux:grub2-emu, p-cpe:/a:amazon:linux:grub2-emu-modules, p-cpe:/a:amazon:linux:grub2-pc, p-cpe:/a:amazon:linux:grub2-pc-modules, p-cpe:/a:amazon:linux:grub2-tools, p-cpe:/a:amazon:linux:grub2-tools-efi, p-cpe:/a:amazon:linux:grub2-tools-extra, p-cpe:/a:amazon:linux:grub2-tools-minimal, cpe:/o:amazon:linux:2

Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 4/25/2022

Vulnerability Publication Date: 3/10/2022

Reference Information

CVE: CVE-2021-3981

ALAS: 2022-1787