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CVE-2020-27352

Publication date 10 February 2021

Last updated 24 July 2024

Ubuntu priority

High

Why this priority?

Cvss 3 Severity Score

9.3 · Critical

Score breakdown

When generating the systemd service units for the docker snap (and other similar snaps), snapd does not specify Delegate=yes - as a result systemd will move processes from the containers created and managed by these snaps into the cgroup of the main daemon within the snap itself when reloading system units. This may grant additional privileges to a container within the snap that were not originally intended.

From the Ubuntu Security Team

Gilad Reti and Nimrod Stoler discovered that snapd did not correctly specify cgroup delegation when generating systemd service units for various container management snaps. This could allow a local attacker to escalate privileges via access to arbitrary devices of the container host from within a compromised or malicious container.

Status

Package Ubuntu Release Status
snapd 20.10 groovy
Fixed 2.48.3+20.10
20.04 LTS focal
Fixed 2.48.3+20.04
18.04 LTS bionic
Fixed 2.48.3+18.04
16.04 LTS xenial
Fixed 2.48.3
14.04 LTS trusty Not in release

Severity score breakdown

Parameter Value
Base score 9.3 · Critical
Attack vector Local
Attack complexity Low
Privileges required None
User interaction None
Scope Changed
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

Other references