CVE-2021-4122

2022-01-1300:00:00

ubuntu.com

4.3 Medium

CVSS3

Attack Vector

PHYSICAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

1.9 Low

CVSS2

Access Vector

LOCAL

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

NONE

AV:L/AC:M/Au:N/C:N/I:P/A:N

0.001 Low

EPSS

Percentile

29.1%

JSON

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.

Bugs

Notes

Author	Note
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

OSVersionArchitecturePackageVersionFilename
ubuntu20.04noarchcryptsetup< 2:2.2.2-3ubuntu2.4UNKNOWN
ubuntu21.10noarchcryptsetup< 2:2.3.7-0ubuntu0.21.10.1UNKNOWN
ubuntu22.04noarchcryptsetup< 2:2.4.3-1ubuntu1UNKNOWN

OS	Version	Architecture	Package	Version	Filename
ubuntu	20.04	noarch	cryptsetup	< 2:2.2.2-3ubuntu2.4	UNKNOWN
ubuntu	21.10	noarch	cryptsetup	< 2:2.3.7-0ubuntu0.21.10.1	UNKNOWN
ubuntu	22.04	noarch	cryptsetup	< 2:2.4.3-1ubuntu1	UNKNOWN