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Ubuntu: USN-4992-1 (CVE-2020-27779): GRUB 2 vulnerabilities

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Ubuntu: USN-4992-1 (CVE-2020-27779): GRUB 2 vulnerabilities

Severity
7
CVSS
(AV:L/AC:M/Au:N/C:C/I:C/A:C)
Published
03/02/2021
Created
06/21/2021
Added
06/18/2021
Modified
01/21/2022

Description

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.

Solution(s)

  • ubuntu-upgrade-grub-efi-amd64-bin
  • ubuntu-upgrade-grub-efi-amd64-signed
  • ubuntu-upgrade-grub-efi-arm64-bin
  • ubuntu-upgrade-grub-efi-arm64-signed

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