CVE-2020-25647

Published: 02 March 2021

A flaw was found in grub2 in versions prior to 2.06. During USB device initialization, descriptors are read with very little bounds checking and assumes the USB device is providing sane values. If properly exploited, an attacker could trigger memory corruption leading to arbitrary code execution allowing a bypass of the Secure Boot mechanism. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Priority

Medium

CVSS 3 base score: 7.6

Status

Package Release Status
grub2
Launchpad, Ubuntu, Debian
Upstream Needs triage

Ubuntu 21.10 (Impish Indri) Not vulnerable
(usb not allowed in secure boot)
Ubuntu 21.04 (Hirsute Hippo) Not vulnerable
(usb not allowed in secure boot)
Ubuntu 20.04 LTS (Focal Fossa) Not vulnerable
(usb not allowed in secure boot)
Ubuntu 18.04 LTS (Bionic Beaver) Not vulnerable
(usb not allowed in secure boot)
Ubuntu 16.04 ESM (Xenial Xerus) Not vulnerable
(usb not allowed in secure boot)
Ubuntu 14.04 ESM (Trusty Tahr) Not vulnerable
(usb not allowed in secure boot)
grub2-signed
Launchpad, Ubuntu, Debian
Upstream Needs triage

Ubuntu 21.10 (Impish Indri) Not vulnerable
(usb not allowed in secure boot)
Ubuntu 21.04 (Hirsute Hippo) Not vulnerable
(usb not allowed in secure boot)
Ubuntu 20.04 LTS (Focal Fossa) Not vulnerable
(usb not allowed in secure boot)
Ubuntu 18.04 LTS (Bionic Beaver) Not vulnerable
(usb not allowed in secure boot)
Ubuntu 16.04 ESM (Xenial Xerus) Not vulnerable
(usb not allowed in secure boot)
Ubuntu 14.04 ESM (Trusty Tahr) Not vulnerable
(usb not allowed in secure boot)
grub2-unsigned
Launchpad, Ubuntu, Debian
Upstream Needs triage

Ubuntu 21.10 (Impish Indri) Not vulnerable
(usb not allowed in secure boot)
Ubuntu 21.04 (Hirsute Hippo) Not vulnerable
(usb not allowed in secure boot)
Ubuntu 20.04 LTS (Focal Fossa) Not vulnerable
(usb not allowed in secure boot)
Ubuntu 18.04 LTS (Bionic Beaver) Not vulnerable
(usb not allowed in secure boot)
Ubuntu 16.04 ESM (Xenial Xerus) Not vulnerable
(usb not allowed in secure boot)
Ubuntu 14.04 ESM (Trusty Tahr) Not vulnerable
(usb not allowed in secure boot)

Notes

AuthorNote
sbeattie
Ubuntu packaging does not include the usb module in the signed EFI grub artifacts, so is not affected. grub2-unsigned will contain fixes and supersede grub2, which will contain only BIOS grub bits.

References