CVE-2021-3981
Published: 10 March 2022
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.
Notes
| Author | Note |
|---|---|
| mdeslaur | Introduced by: https://git.savannah.gnu.org/gitweb/?p=grub.git;a=commit;h=ab2e53c8a196a595e50f1c836bf756b9db1ae68d |
| eslerm | patch applied in grub-2.12-rc1 |
Priority
Status
| Package | Release | Status |
|---|---|---|
|
grub2 Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(does not affect Secure Boot)
|
| focal |
Not vulnerable
(does not affect Secure Boot)
|
|
| hirsute |
Ignored
(end of life)
|
|
| impish |
Ignored
(end of life)
|
|
| jammy |
Not vulnerable
(does not affect Secure Boot)
|
|
| kinetic |
Ignored
(end of life, was needed)
|
|
| lunar |
Ignored
(end of life, was needed)
|
|
| mantic |
Not vulnerable
(does not affect Secure Boot)
|
|
| noble |
Not vulnerable
(does not affect Secure Boot)
|
|
| trusty |
Not vulnerable
(does not affect Secure Boot)
|
|
| upstream |
Needs triage
|
|
| xenial |
Not vulnerable
(does not affect Secure Boot)
|
|
|
Patches: upstream: https://git.savannah.gnu.org/gitweb/?p=grub.git;a=commit;h=0adec29674561034771c13e446069b41ef41e4d4 |
||
|
grub2-signed Launchpad, Ubuntu, Debian |
bionic |
Needs triage
|
| focal |
Released
(1.187.3~20.04.1)
|
|
| jammy |
Released
(1.187.3~22.04.1)
|
|
| kinetic |
Ignored
(end of life, was needed)
|
|
| lunar |
Not vulnerable
(1.192)
|
|
| mantic |
Not vulnerable
(1.194)
|
|
| noble |
Not vulnerable
(1.194)
|
|
| trusty |
Needs triage
|
|
| upstream |
Needs triage
|
|
| xenial |
Needs triage
|
|
|
grub2-unsigned Launchpad, Ubuntu, Debian |
bionic |
Needs triage
|
| focal |
Released
(2.06-2ubuntu14.1)
|
|
| jammy |
Released
(2.06-2ubuntu14.1)
|
|
| kinetic |
Ignored
(end of life, was needed)
|
|
| lunar |
Not vulnerable
(2.06-2ubuntu16)
|
|
| mantic |
Not vulnerable
(2.12~rc1-4ubuntu1)
|
|
| noble |
Not vulnerable
(2.12~rc1-4ubuntu1)
|
|
| trusty |
Does not exist
|
|
| upstream |
Needs triage
|
|
| xenial |
Needs triage
|
|
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 3.3 |
| 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 |