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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/

Mailing list: debian-security-announce@lists.debian.org
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