CVE-2021-4120

2022-02-1700:00:00

ubuntu.com

7.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

4.6 Medium

CVSS2

Access Vector

LOCAL

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

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

0.001 Low

EPSS

Percentile

28.2%

JSON

snapd 2.54.2 fails to perform sufficient validation of snap content
interface and layout paths, resulting in the ability for snaps to inject
arbitrary AppArmor policy rules via malformed content interface and layout
declarations and hence escape strict snap confinement. Fixed in snapd
versions 2.54.3+18.04, 2.54.3+20.04 and 2.54.3+21.10.1

Bugs

<https://bugs.launchpad.net/snapd/+bug/1949368>

OSVersionArchitecturePackageVersionFilename
ubuntu18.04noarchsnapd< 2.54.3+18.04UNKNOWN
ubuntu20.04noarchsnapd< 2.54.3+20.04UNKNOWN
ubuntu21.10noarchsnapd< 2.54.3+21.10.1UNKNOWN
ubuntu14.04noarchsnapd< 2.54.3+14.04~esm1) Available with Ubuntu Pro or Ubuntu Pro (Infra-onlyUNKNOWN
ubuntu16.04noarchsnapd< 2.54.3+16.04~esm2) Available with Ubuntu Pro or Ubuntu Pro (Infra-onlyUNKNOWN

OS	Version	Architecture	Package	Version	Filename
ubuntu	18.04	noarch	snapd	< 2.54.3+18.04	UNKNOWN
ubuntu	20.04	noarch	snapd	< 2.54.3+20.04	UNKNOWN
ubuntu	21.10	noarch	snapd	< 2.54.3+21.10.1	UNKNOWN
ubuntu	14.04	noarch	snapd	< 2.54.3+14.04~esm1) Available with Ubuntu Pro or Ubuntu Pro (Infra-only	UNKNOWN
ubuntu	16.04	noarch	snapd	< 2.54.3+16.04~esm2) Available with Ubuntu Pro or Ubuntu Pro (Infra-only	UNKNOWN