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CVE-2021-27097

Published: 17 February 2021

The boot loader in Das U-Boot before 2021.04-rc2 mishandles a modified FIT.

Notes

AuthorNote
mdeslaur
This fix changes behaviour and would introduce regressions in
existing installations. We will not be fixing this issue in
Ubuntu stable releases.
See here for an example:
https://lore.kernel.org/lkml/20210409192128.3998606-1-nathan@kernel.org/
https://www.linux4sam.org/bin/view/Linux4SAM/HasherrorwhenbootingFITimage
https://github.com/linux4sam/dt-overlay-at91/commit/7ad311899af48efbb43f0e3ac935da5981bd4b2d

b6f4c757959f8850e1299a77c8e5713da78e8ec0 is the complete patch
set that fixes both CVE-2021-27097 and CVE-2021-27138

Priority

Low

Cvss 3 Severity Score

7.8

Score breakdown

Status

Package Release Status
u-boot
Launchpad, Ubuntu, Debian
bionic Ignored

hirsute Ignored
(end of life)
jammy Not vulnerable
(2021.07+dfsg-0ubuntu2)
kinetic Not vulnerable
(2021.07+dfsg-0ubuntu2)
xenial Ignored

impish Not vulnerable
(2021.07+dfsg-0ubuntu2)
groovy Ignored
(end of life)
trusty Does not exist

upstream
Released (2021.04~rc3+dfsg-1)
focal Ignored

Patches:
upstream: https://github.com/u-boot/u-boot/commit/6f3c2d8aa5e6cbd80b5e869bbbddecb66c329d01
upstream: https://github.com/u-boot/u-boot/commit/8a7d4cf9820ea16fabd25a6379351b4dc291204b
upstream: https://github.com/u-boot/u-boot/commit/b6f4c757959f8850e1299a77c8e5713da78e8ec0 (complete patch)

Severity score breakdown

Parameter Value
Base score 7.8
Attack vector Local
Attack complexity Low
Privileges required None
User interaction Required
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H