Improper Authorization Affecting grub2-efi-aa64-cdboot package, versions <1:2.02-90.el8_3.1


Severity

Recommended
medium

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.04% (6th percentile)

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  • Snyk IDSNYK-RHEL8-GRUB2EFIAA64CDBOOT-3960158
  • published26 Jul 2021
  • disclosed2 Mar 2021

Introduced: 2 Mar 2021

CVE-2020-27779  (opens in a new tab)
CWE-285  (opens in a new tab)

How to fix?

Upgrade RHEL:8 grub2-efi-aa64-cdboot to version 1:2.02-90.el8_3.1 or higher.
This issue was patched in RHSA-2021:0696.

NVD Description

Note: Versions mentioned in the description apply only to the upstream grub2-efi-aa64-cdboot package and not the grub2-efi-aa64-cdboot package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

A flaw was found in grub2 in versions prior to 2.06. The cutmem command does not honor secure boot locking allowing an privileged attacker to remove address ranges from memory creating an opportunity to circumvent SecureBoot protections after proper triage about grub's memory layout. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

CVSS Scores

version 3.1