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Red Hat: CVE-2020-27779: cutmem command allows privileged user to remove memory regions when Secure Boot is enabled (Multiple Advisories)

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Red Hat: CVE-2020-27779: cutmem command allows privileged user to remove memory regions when Secure Boot is enabled (Multiple Advisories)

Severity
7
CVSS
(AV:L/AC:M/Au:N/C:C/I:C/A:C)
Published
03/02/2021
Created
03/04/2021
Added
03/03/2021
Modified
12/15/2023

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)

  • redhat-upgrade-fwupd
  • redhat-upgrade-fwupd-debuginfo
  • redhat-upgrade-fwupd-debugsource
  • redhat-upgrade-fwupd-tests-debuginfo
  • redhat-upgrade-grub2
  • redhat-upgrade-grub2-common
  • redhat-upgrade-grub2-debuginfo
  • redhat-upgrade-grub2-debugsource
  • redhat-upgrade-grub2-efi-aa64-modules
  • redhat-upgrade-grub2-efi-ia32
  • redhat-upgrade-grub2-efi-ia32-cdboot
  • redhat-upgrade-grub2-efi-ia32-modules
  • redhat-upgrade-grub2-efi-x64
  • redhat-upgrade-grub2-efi-x64-cdboot
  • redhat-upgrade-grub2-efi-x64-modules
  • redhat-upgrade-grub2-pc
  • redhat-upgrade-grub2-pc-modules
  • redhat-upgrade-grub2-ppc-modules
  • redhat-upgrade-grub2-ppc64-modules
  • redhat-upgrade-grub2-ppc64le-modules
  • redhat-upgrade-grub2-tools
  • redhat-upgrade-grub2-tools-debuginfo
  • redhat-upgrade-grub2-tools-efi
  • redhat-upgrade-grub2-tools-efi-debuginfo
  • redhat-upgrade-grub2-tools-extra
  • redhat-upgrade-grub2-tools-extra-debuginfo
  • redhat-upgrade-grub2-tools-minimal
  • redhat-upgrade-grub2-tools-minimal-debuginfo
  • redhat-upgrade-shim-ia32
  • redhat-upgrade-shim-unsigned-x64
  • redhat-upgrade-shim-x64

References

  • CVE-2020-27779
  • RHSA-2021:0696
  • RHSA-2021:0697
  • RHSA-2021:0698
  • RHSA-2021:0699
  • RHSA-2021:0700
  • RHSA-2021:0701
  • RHSA-2021:1734
  • RHSA-2021:2566
  • RHSA-2021:2790
  • RHSA-2021:3675
View more

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