containerd CRI stream server vulnerable to host memory exhaustion via terminal

中 6.5CVE-2022-23471 · GHSA-2qjp-425j-52j9 · GO-2022-1147 · 07/12/2022 公開 · 17/06/2026 更新

要点

CVE-2022-23471 は github.com/containerd/containerd, containerd (linuxfoundation) に影響する深刻度「中」 (CVSS 6.5) の脆弱性です。
今後30日間に悪用される確率（EPSS）：1.1%（全脆弱性の 65.9% より高い）。
対処：1.6.12, 1.5.16 以降に更新してください。

パッケージ	影響を受けるバージョン	修正済みバージョン
github.com/containerd/containerd Go	`≥ 1.6.0, < 1.6.12< 1.5.16`	`1.6.121.5.16`
containerd linuxfoundation	`≥ 1.6.0, < 1.6.12< 1.5.16`	`1.6.121.5.16`

概要

Impact

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.

Patches

This bug has been fixed in containerd 1.6.12 and 1.5.16. Users should update to these versions to resolve the issue.

Workarounds

Ensure that only trusted images and commands are used and that only trusted users have permissions to execute commands in running containers.

For more information

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NVD の説明

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.