CVE Vulnerability

CVE-2021-43816

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.

6 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 6.8 / Impact : 6.4

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact PARTIAL

Scope

9.1 /10

CVSS v3.0 : CRITICAL

V3 Legend

Vector :

Exploitability : 2.3 / Impact : 6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required HIGH

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope CHANGED

References
Link Resource
https://github.com/containerd/containerd/security/advisories/GHSA-mvff-h3cj-wj9c Third Party Advisory
https://github.com/containerd/containerd/issues/6194 Exploit Issue Tracking
https://github.com/dweomer/containerd/commit/f7f08f0e34fb97392b0d382e58916d6865100299 Patch Third Party Advisory
https://github.com/containerd/containerd/commit/a731039238c62be081eb8c31525b988415745eea Patch Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MPDIZMI7ZPERSZE2XO265UCK5IWM7CID/ Mailing List Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GD5GH7NMK5VJMA2Y5CYB5O5GTPYMWMLX/ Mailing List Third Party Advisory
Configurations

Configuration 1

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:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:containerd:*:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
Information

Published : 2022-01-05 07:15

Updated : 2022-04-01 02:50

NVD link : CVE-2021-43816

Mitre link : CVE-2021-43816

Products Affected
No products.
CWE
CWE-281

Improper Preservation of Permissions