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CVE-2022-24778

Published: 25 March 2022

The imgcrypt library provides API exensions for containerd to support encrypted container images and implements the ctd-decoder command line tool for use by containerd to decrypt encrypted container images. The imgcrypt function `CheckAuthorization` is supposed to check whether the current used is authorized to access an encrypted image and prevent the user from running an image that another user previously decrypted on the same system. In versions prior to 1.1.4, a failure occurs when an image with a ManifestList is used and the architecture of the local host is not the first one in the ManifestList. Only the first architecture in the list was tested, which may not have its layers available locally since it could not be run on the host architecture. Therefore, the verdict on unavailable layers was that the image could be run anticipating that image run failure would occur later due to the layers not being available. However, this verdict to allow the image to run enabled other architectures in the ManifestList to run an image without providing keys if that image had previously been decrypted. A patch has been applied to imgcrypt 1.1.4. Workarounds may include usage of different namespaces for each remote user.

Priority

Medium

Cvss 3 Severity Score

7.5

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 Not vulnerable
(1.6.4-0ubuntu1)
trusty Ignored
(out of standard support)
upstream
Released (1.6.3)
xenial Needs triage

Patches:
upstream: https://github.com/containerd/imgcrypt/commit/6fdd9818a4d8142107b7ecd767d839c9707700d9

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact None
Availability impact None
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N