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CVE-2021-3981

Publication date 10 March 2022

Last updated 24 July 2024

Ubuntu priority

Low

Why this priority?

Cvss 3 Severity Score

3.3 · Low

Score breakdown

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.

Read the notes from the security team

Status

Package Ubuntu Release Status
grub2 24.04 LTS noble
Not affected
23.10 mantic
Not affected
23.04 lunar Ignored
22.10 kinetic Ignored
22.04 LTS jammy
Not affected
21.10 impish Ignored
21.04 hirsute Ignored
20.04 LTS focal
Not affected
18.04 LTS bionic
Not affected
16.04 LTS xenial
Not affected
14.04 LTS trusty
Not affected
grub2-signed 24.04 LTS noble
Not affected
23.10 mantic
Not affected
23.04 lunar
Not affected
22.10 kinetic Ignored
22.04 LTS jammy
Fixed 1.187.3~22.04.1
20.04 LTS focal
Fixed 1.187.3~20.04.1
18.04 LTS bionic
Needs evaluation
16.04 LTS xenial
Needs evaluation
14.04 LTS trusty
Needs evaluation
grub2-unsigned 24.04 LTS noble
Not affected
23.10 mantic
Not affected
23.04 lunar
Not affected
22.10 kinetic Ignored
22.04 LTS jammy
Fixed 2.06-2ubuntu14.1
20.04 LTS focal
Fixed 2.06-2ubuntu14.1
18.04 LTS bionic
Needs evaluation
16.04 LTS xenial
Needs evaluation
14.04 LTS trusty Not in release

Notes

mdeslaur

Introduced by: https://git.savannah.gnu.org/gitweb/?p=grub.git;a=commit;h=ab2e53c8a196a595e50f1c836bf756b9db1ae68d

eslerm

patch applied in grub-2.12-rc1

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
grub2

Severity score breakdown

Parameter Value
Base score 3.3 · Low
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality Low
Integrity impact None
Availability impact None
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

References

Related Ubuntu Security Notices (USN)

    • USN-6355-1
    • GRUB2 vulnerabilities
    • 8 September 2023

Other references