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CVE-2022-23471

Published: 8 December 2022

containerd is an open source container runtime. A bug was found in containerd's CRI implementation where a user can exhaust memory on the host. In the CRI stream server, a goroutine is launched to handle terminal resize events if a TTY is requested. If the user's process fails to launch due to, for example, a faulty command, the goroutine will be stuck waiting to send without a receiver, resulting in a memory leak. Kubernetes and crictl can both be configured to use containerd's CRI implementation and the stream server is used for handling container IO. This bug has been fixed in containerd 1.6.12 and 1.5.16. Users should update to these versions to resolve the issue. Users unable to upgrade should ensure that only trusted images and commands are used and that only trusted users have permissions to execute commands in running containers.

Priority

Medium

Cvss 3 Severity Score

6.5

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)
jammy
Released (1.5.9-0ubuntu3.1)
kinetic
Released (1.6.4-0ubuntu1.1)
trusty Ignored
(out of standard support)
upstream
Released (1.5.16,1.6.12)
xenial Needs triage

Severity score breakdown

Parameter Value
Base score 6.5
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H