A grub2 security update has been released for Debian GNU/Linux 10 to address several vulnerabilities.
DSA 4867-1: grub2 security update
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Debian Security Advisory DSA-4867-1 security@debian.org
https://www.debian.org/security/ Salvatore Bonaccorso
March 02, 2021 https://www.debian.org/security/faq
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Package : grub2
CVE ID : CVE-2020-14372 CVE-2020-25632 CVE-2020-25647 CVE-2020-27749
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
For the stable distribution (buster), these problems have been fixed in
version 2.02+dfsg1-20+deb10u4.
We recommend that you upgrade your grub2 packages.
For the detailed security status of grub2 please refer to its security
tracker page at:
https://security-tracker.debian.org/tracker/grub2
Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/
