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CVE-2021-4120

Published: 17 February 2022

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

Priority

Medium

Cvss 3 Severity Score

8.2

Score breakdown

Status

Package Release Status
snapd
Launchpad, Ubuntu, Debian
bionic
Released (2.54.3+18.04)
focal
Released (2.54.3+20.04)
hirsute Ignored
(end of life)
impish
Released (2.54.3+21.10.1)
upstream
Released (2.54.3)

Severity score breakdown

Parameter Value
Base score 8.2
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction Required
Scope Changed
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H