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CVE-2022-24769

Published: 24 March 2022

Moby is an open-source project created by Docker to enable and accelerate software containerization. A bug was found in Moby (Docker Engine) prior to version 20.10.14 where containers were incorrectly started with non-empty inheritable Linux process capabilities, creating an atypical Linux environment and enabling programs with inheritable file capabilities to elevate those capabilities to the permitted set during `execve(2)`. Normally, when executable programs have specified permitted file capabilities, otherwise unprivileged users and processes can execute those programs and gain the specified file capabilities up to the bounding set. Due to this bug, containers which included executable programs with inheritable file capabilities allowed otherwise unprivileged users and processes to additionally gain these inheritable file capabilities up to the container's bounding set. Containers which use Linux users and groups to perform privilege separation inside the container are most directly impacted. This bug did not affect the container security sandbox as the inheritable set never contained more capabilities than were included in the container's bounding set. This bug has been fixed in Moby (Docker Engine) 20.10.14. Running containers should be stopped, deleted, and recreated for the inheritable capabilities to be reset. This fix changes Moby (Docker Engine) behavior such that containers are started with a more typical Linux environment. As a workaround, the entry point of a container can be modified to use a utility like `capsh(1)` to drop inheritable capabilities prior to the primary process starting.

Priority

Medium

Cvss 3 Severity Score

5.9

Score breakdown

Status

Package Release Status
containerd
Launchpad, Ubuntu, Debian
bionic
Released (1.5.9-0ubuntu1~18.04.2)
focal
Released (1.5.9-0ubuntu1~20.04.6)
impish Ignored
(reached end-of-life)
jammy
Released (1.5.9-0ubuntu3.1)
kinetic
Released (1.6.4-0ubuntu1)
trusty Ignored
(out of standard support)
upstream
Released (1.6.2~ds1-1,1.5.11)
xenial Needs triage

Patches:
upstream: https://github.com/moby/moby/commit/2bbc786e4c59761d722d2d1518cd0a32829bc07f

Severity score breakdown

Parameter Value
Base score 5.9
Attack vector Local
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality Low
Integrity impact Low
Availability impact Low
Vector CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L