CVE-2021-21334

Published: 05 March 2021

In containerd (an industry-standard container runtime) before versions 1.3.10 and 1.4.4, containers launched through containerd's CRI implementation (through Kubernetes, crictl, or any other pod/container client that uses the containerd CRI service) that share the same image may receive incorrect environment variables, including values that are defined for other containers. If the affected containers have different security contexts, this may allow sensitive information to be unintentionally shared. If you are not using containerd's CRI implementation (through one of the mechanisms described above), you are not vulnerable to this issue. If you are not launching multiple containers or Kubernetes pods from the same image which have different environment variables, you are not vulnerable to this issue. If you are not launching multiple containers or Kubernetes pods from the same image in rapid succession, you have reduced likelihood of being vulnerable to this issue This vulnerability has been fixed in containerd 1.3.10 and containerd 1.4.4. Users should update to these versions.

Priority

Medium

CVSS 3 base score: 6.3

Status

Package Release Status
containerd
Launchpad, Ubuntu, Debian
Upstream
Released (1.3.10,1.4.4~ds1-1)
Ubuntu 21.04 (Hirsute Hippo)
Released (1.4.4-0ubuntu1)
Ubuntu 20.10 (Groovy Gorilla)
Released (1.3.7-0ubuntu3.3)
Ubuntu 20.04 LTS (Focal Fossa)
Released (1.3.3-0ubuntu2.3)
Ubuntu 18.04 LTS (Bionic Beaver) Needed

Ubuntu 16.04 LTS (Xenial Xerus) Needed

Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

Patches:
Upstream: https://github.com/containerd/containerd/commit/2d9c8aa4b3f4313982c5c999af57212a1c5d144b (1.3)
Upstream: https://github.com/containerd/containerd/commit/cbcb2f57fbe221986f96b552855eb802f63193de (1.4)
Upstream: https://github.com/containerd/cri/commit/7ea3462fc2d4e550b307cefb282b7408d7d7f997 (isolated fix 1.3)
Upstream: https://github.com/containerd/cri/commit/f9bcbb7329a47f34261da2cfafa6bd5f63268437 (isolated fix 1.4)