Vulnerability Report

CVE-2021-43816

Title: Linuxfoundation Containerd

Other

Proof Of Concept

No public PoC currently indexed for CVE-2021-43816.

CWE Category CWE-281
Published Date Jan 05, 2022
Modified Date Nov 21, 2024
Exploit Status Not Found
Score 8.0 CVSS v3.1
Exploit Probability (EPSS)
0.15%

Vulnerability Summary

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.

Impacted Vendors

L
linuxfoundation 1

Reference Links

https://github.com/containerd/containerd/commit/a731039238c62be081eb8c31525b988415745eea https://github.com/containerd/containerd/issues/6194 https://github.com/containerd/containerd/security/advisories/GHSA-mvff-h3cj-wj9c https://github.com/dweomer/containerd/commit/f7f08f0e34fb97392b0d382e58916d6865100299 https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GD5GH7NMK5VJMA2Y5CYB5O5GTPYMWMLX/ https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MPDIZMI7ZPERSZE2XO265UCK5IWM7CID/ https://github.com/containerd/containerd/commit/a731039238c62be081eb8c31525b988415745eea https://github.com/containerd/containerd/issues/6194 https://github.com/containerd/containerd/security/advisories/GHSA-mvff-h3cj-wj9c https://github.com/dweomer/containerd/commit/f7f08f0e34fb97392b0d382e58916d6865100299 https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GD5GH7NMK5VJMA2Y5CYB5O5GTPYMWMLX/ https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MPDIZMI7ZPERSZE2XO265UCK5IWM7CID/
CVSS v3.1
Source Entity [email protected]
Severity HIGH
8.0
Attack Vector
NETWORK
Complexity
HIGH
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
CHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
CVSS v3.1
Source Entity [email protected]
Severity CRITICAL
9.1
Attack Vector
NETWORK
Complexity
LOW
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
CHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CVSS v2.0
Source Entity [email protected]
Severity MEDIUM
6.0
Access Vector
N/A
Authentication
N/A
RAW VECTOR AV:N/AC:M/Au:S/C:P/I:P/A:P

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2021-43816 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

MODIFIED

Vulnerability data or affected products updated.

PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector NETWORK
Complexity HIGH
Privileges N/A
Interaction NONE
CVSS Vector String CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

Affected Stack

No specific products linked.