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CVE-2021-43816

Improper Preservation of Permissions in containerd

Published: Jan 5, 2022Updated: Nov 21, 2024 Sources: CVE List NVD GHSACWE-281
NVD MITRE
8.0CVSSHIGH
EPSS Score
1.7%
Top 25.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:HPR:HUI:NS:CC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:HPrivileges Required
High
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-281

Affected Products

containerdcontainerd
On-prem
Cloud & SaaS / container-orchestration
containerdlinuxfoundation
Mixed
AI / ML / ml-framework
fedorafedoraproject
On-premOS
Operating Systems / linux-distro
github.com/containerd/containerdGoOSS Libraries
containerdoss-projectCloud & SaaSaka containerd, imgcrypt
linuxfoundationoss-projectUSAI / MLaka yocto, pytorch, everest
fedoraprojectoss-projectUSOperating Systemsaka fedora project
gopackage-ecosystemOSS Libraries

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Privilege Escalation
View detailed technique mapping

References

https://github.com/containerd/containerd/security/advisories/GHSA-mvff-h3cj-wj9c
github.com
https://github.com/containerd/containerd/issues/6194
github.com
https://github.com/containerd/containerd/commit/a731039238c62be081eb8c31525b988415745eea
github.com
and 7 more references View all →

Timeline

Published
Jan 5, 2022
Last Updated
Nov 21, 2024

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