critical
9.1
CWE
281
Advisory Published
CVE Published
Updated

CVE-2021-43816: Improper Preservation of Permissions in containerd

First published: Wed Jan 05 2022(Updated: )

An incorrect permission assignment flaw was found in containerd. This flaw allows a local attacker to use a specially designed text file to read and write files outside of the container's scope.

Credit: security-advisories@github.com security-advisories@github.com

Affected SoftwareAffected VersionHow to fix
Linuxfoundation Containerd>=1.5.1<1.5.9
Linuxfoundation Containerd=1.5.0
Linuxfoundation Containerd=1.5.0-beta0
Linuxfoundation Containerd=1.5.0-beta1
Linuxfoundation Containerd=1.5.0-beta2
Linuxfoundation Containerd=1.5.0-beta3
Linuxfoundation Containerd=1.5.0-beta4
Linuxfoundation Containerd=1.5.0-rc0
Linuxfoundation Containerd=1.5.0-rc1
Linuxfoundation Containerd=1.5.0-rc2
Linuxfoundation Containerd=1.5.0-rc3
Fedoraproject Fedora=34
Fedoraproject Fedora=35
redhat/github.com/containerd/containerd<1.5.9
1.5.9
>=1.5.1<1.5.9
=1.5.0
=1.5.0-beta0
=1.5.0-beta1
=1.5.0-beta2
=1.5.0-beta3
=1.5.0-beta4
=1.5.0-rc0
=1.5.0-rc1
=1.5.0-rc2
=1.5.0-rc3
=34
=35

Remedy

https://github.com/containerd/containerd/commit/a731039238c62be081eb8c31525b988415745eea

Remedy

https://github.com/dweomer/containerd/commit/f7f08f0e34fb97392b0d382e58916d6865100299

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2021-43816?

    CVE-2021-43816 is an incorrect permission assignment flaw found in containerd, a container runtime.

  • What is the severity of CVE-2021-43816?

    CVE-2021-43816 has a severity rating of 9.1 (Critical).

  • How does CVE-2021-43816 affect containerd?

    CVE-2021-43816 allows a local attacker to bind mount an unprivileged pod to the node via the hostPath volume on installations using SELinux with containerd as the backing container runtime interface (CRI).

  • Which versions of containerd are affected by CVE-2021-43816?

    Containerd versions 1.5.0-beta0 to 1.5.9 are affected by CVE-2021-43816.

  • How can I fix CVE-2021-43816?

    To fix CVE-2021-43816, update containerd to version 1.5.9.

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