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CVE-2021-44731

Published: 17 February 2022

A race condition existed in the snapd 2.54.2 snap-confine binary when preparing a private mount namespace for a snap. This could allow a local attacker to gain root privileges by bind-mounting their own contents inside the snap's private mount namespace and causing snap-confine to execute arbitrary code and hence gain privilege escalation. Fixed in snapd versions 2.54.3+18.04, 2.54.3+20.04 and 2.54.3+21.10.1

Priority

High

Cvss 3 Severity Score

7.8

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 7.8
Attack vector Local
Attack complexity High
Privileges required Low
User interaction None
Scope Changed
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H