grub2: CVE-2021-3981: Incorrect permission in grub.cfg allow unprivileged user to read the file content

Debian Bug report logs - #1001414
grub2: CVE-2021-3981: Incorrect permission in grub.cfg allow unprivileged user to read the file content

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Salvatore Bonaccorso <carnil@debian.org>

To: Debian Bug Tracking System <submit@bugs.debian.org>

Subject: grub2: CVE-2021-3981: Incorrect permission in grub.cfg allow unprivileged user to read the file content

Date: Thu, 09 Dec 2021 21:01:13 +0100

Source: grub2
Version: 2.06-2
Severity: important
Tags: security upstream
X-Debbugs-Cc: carnil@debian.org, Debian Security Team <team@security.debian.org>

Hi,

The following vulnerability was published for grub2.

CVE-2021-3981[0]:
| Incorrect permission in grub.cfg allow unprivileged user to read the
| file content

It was only introduced with [1] and patch upstream is in [2].

When the config contains "^password" then the grub.cfg would need to
be created with stricter permissions.

If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2021-3981
    https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3981
[1] https://git.savannah.gnu.org/gitweb/?p=grub.git;a=commit;h=ab2e53c8a196a595e50f1c836bf756b9db1ae68d
[2] https://lists.gnu.org/archive/html/grub-devel/2021-12/msg00013.html
[3] https://bugzilla.redhat.com/show_bug.cgi?id=2024170

Regards,
Salvatore

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