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CVE-2021-43816 Details

Description

containerd is an open source container runtime. On installations using SELinux, such as EL8 (CentOS, RHEL), Fedora, or SUSE MicroOS, with containerd since v1.5.0-beta.0 as the backing container runtime interface (CRI), an unprivileged pod scheduled to the node may bind mount, via hostPath volume, any privileged, regular file on disk for complete read/write access (sans delete). Such is achieved by placing the in-container location of the hostPath volume mount at either `/etc/hosts`, `/etc/hostname`, or `/etc/resolv.conf`. These locations are being relabeled indiscriminately to match the container process-label which effectively elevates permissions for savvy containers that would not normally be able to access privileged host files. This issue has been resolved in version 1.5.9. Users are advised to upgrade as soon as possible.

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References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.

URLSource(s)Tag(s)
https://github.com/containerd/containerd/commit/a731039238c62be081eb8c31525b988415745eea CVEPatchThird Party Advisory
https://github.com/containerd/containerd/issues/6194 CVEExploitIssue TrackingThird Party Advisory
https://github.com/containerd/containerd/security/advisories/GHSA-mvff-h3cj-wj9c CVEThird Party Advisory
https://github.com/dweomer/containerd/commit/f7f08f0e34fb97392b0d382e58916d6865100299 CVEPatchThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GD5GH7NMK5VJMA2Y5CYB5O5GTPYMWMLX/ CVE

see all 12 references

Weakness Enumeration

CWE-IDCWE NameSource
CWE-281Improper Preservation of Permissions[email protected]
CWE-281Improper Preservation of Permissions[email protected]

Affected Products

ProductVersions
linuxfoundation containerd
>= 1.5.1, < 1.5.9
1.5.0 -
1.5.0 beta0
1.5.0 beta1
1.5.0 beta2

CPE

  • cpe:2.3:a:linuxfoundation:containerd:*:*:*:*:*:*:*:*
  • cpe:2.3:a:linuxfoundation:containerd:1.5.0:-:*:*:*:*:*:*
  • cpe:2.3:a:linuxfoundation:containerd:1.5.0:beta0:*:*:*:*:*:*
  • cpe:2.3:a:linuxfoundation:containerd:1.5.0:beta1:*:*:*:*:*:*
  • cpe:2.3:a:linuxfoundation:containerd:1.5.0:beta2:*:*:*:*:*:*
  • cpe:2.3:a:linuxfoundation:containerd:1.5.0:beta3:*:*:*:*:*:*
  • cpe:2.3:a:linuxfoundation:containerd:1.5.0:beta4:*:*:*:*:*:*
  • cpe:2.3:a:linuxfoundation:containerd:1.5.0:rc0:*:*:*:*:*:*
  • cpe:2.3:a:linuxfoundation:containerd:1.5.0:rc1:*:*:*:*:*:*
  • cpe:2.3:a:linuxfoundation:containerd:1.5.0:rc2:*:*:*:*:*:*
  • cpe:2.3:a:linuxfoundation:containerd:1.5.0:rc3:*:*:*:*:*:*

Remediation

  • No remediation found in references.
fedoraproject fedora
34
35

CPE

  • cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
  • cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

8 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2021-43816
NVD Published Date:
Jan 5, 2022
NVD Last Modified:
Jun 17, 2026
Source:
[email protected]
CVE-2021-43816 Details - Not Deferred