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CVE-2021-4122

Published: 13 January 2022

It was found that a specially crafted LUKS header could trick cryptsetup into disabling encryption during the recovery of the device. An attacker with physical access to the medium, such as a flash disk, could use this flaw to force a user into permanently disabling the encryption layer of that medium.

Notes

AuthorNote
alexmurray
Vulnerability is in the online re-encryption feature which is only supported by cryptsetup >= 2.2.0
mdeslaur
per upstream, the backport to 2.2 would be very problematic and
it is suggested that the best option is to disable online
reencryption

Priority

Medium

Cvss 3 Severity Score

5.9

Score breakdown

Status

Package Release Status
cryptsetup
Launchpad, Ubuntu, Debian
jammy
Released (2:2.4.3-1ubuntu1)
bionic Not vulnerable
(code not present)
focal
Released (2:2.2.2-3ubuntu2.4)
hirsute Ignored
(end of life)
impish
Released (2:2.3.7-0ubuntu0.21.10.1)
upstream
Released (2.4.3,2.3.7)
Patches:
upstream: https://gitlab.com/cryptsetup/cryptsetup/-/commit/0113ac2d889c5322659ad0596d4cfc6da53e356c (master)
upstream: https://gitlab.com/cryptsetup/cryptsetup/-/commit/de98f011418c62e7b825a8ce3256e8fcdc84756e (v2.4)
upstream: https://gitlab.com/cryptsetup/cryptsetup/-/commit/60addcffa6794c29dccf33d8db5347f24b75f2fc (v2.3)
upstream: https://gitlab.com/cryptsetup/cryptsetup/-/commit/0fd1c62de9c53958a8ef5d436273284e166254c9 (v2.2 disable)

Severity score breakdown

Parameter Value
Base score 5.9
Attack vector Physical
Attack complexity Low
Privileges required None
User interaction Required
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact None
Vector CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N