Microsoft security update for CVE-2021-3981
🔗 CVE IDs covered (1)
📋 Microsoft's advisory
EchelonGraph does not copy Microsoft's advisory page: its FAQ and remediation text are not shown here. Read the advisory on https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-3981. This page also shows what EchelonGraph holds for CVE-2021-3981, with the description from its CVE record, which the CVE Numbering Authority that assigned the CVE wrote: for a CVE Microsoft assigned, often in the words of Microsoft's own advisory.
🎯 Affected products4
- azl3 grub2 2.06-14 on Azure Linux 3.0
- azl3 grub2 2.06-23 on Azure Linux 3.0
- cbl2 grub2 2.06-5 on CBL Mariner 2.0
- cm1 grub2 2.06~rc1-8 on CBL Mariner 1.0
✅ Updates Microsoft lists: 3 updates
3 rows: one per KB article or update, update type and fixed build. Their details are on Microsoft's advisory.
| KB article | Update | Fixed build |
|---|---|---|
| — | Security Update | - |
| — | Security Update | 2.06-5 |
| — | Security Update | 2.06-14 |
🧭 EchelonGraph on CVE-2021-3981
- EchelonGraph score
- 3.3 LOW
- CISA KEV
- Not listed
- Fix status
- A fix is available — apply it.
Description from the CVE record (CVE.org), as published by its numbering authority
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.
Published by Red Hat, Inc., the CVE Numbering Authority that assigned CVE-2021-3981, in its CVE record at CVE.org; reused under the CVE Program's Terms of Use (its licence and MITRE's copyright notice are in our Terms of Service).