DSA-4867-1

CVE-2020-27779 CVE-2021-20225 CVE-2021-20233

Several vulnerabilities have been discovered in the GRUB2 bootloader.

CVE-2020-14372

It was discovered that the acpi command allows a privileged user to
load crafted ACPI tables when Secure Boot is enabled.

CVE-2020-25632

A use-after-free vulnerability was found in the rmmod command.

CVE-2020-25647

An out-of-bound write vulnerability was found in the
grub_usb_device_initialize() function, which is called to handle USB
device initialization.

CVE-2020-27749

A stack buffer overflow flaw was found in grub_parser_split_cmdline.

CVE-2020-27779

It was discovered that the cutmem command allows a privileged user
to remove memory regions when Secure Boot is enabled.

CVE-2021-20225

A heap out-of-bounds write vulnerability was found in the short form
option parser.

CVE-2021-20233

A heap out-of-bound write flaw was found caused by mis-calculation
of space required for quoting in the menu rendering.

Further detailed information can be found at https://www.debian.org/security/2021-GRUB-UEFI-SecureBoot