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.
CVE-2021-43816 - Critical Severity Vulnerability
An open and reliable container runtime
Library home page: https://proxy.golang.org/github.com/containerd/containerd/@v/v1.5.5.zip
Path to dependency file: /go.mod
Path to vulnerable library: /go.mod
Dependency Hierarchy: - github.com/hyperledger-labs/fabric-smart-client (Root Library) - github.com/docker/dockeR-v20.10.7+incompatible - :x: **github.com/containerd/Containerd-v1.5.5** (Vulnerable Library)
Found in HEAD commit: 999f5d255a183e22a067e6411929924a0bacd65f
Found in base branch: main
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.
Publish Date: 2022-01-05
URL: CVE-2021-43816
Base Score Metrics: - Exploitability Metrics: - Attack Vector: Network - Attack Complexity: Low - Privileges Required: High - User Interaction: None - Scope: Changed - Impact Metrics: - Confidentiality Impact: High - Integrity Impact: High - Availability Impact: High
For more information on CVSS3 Scores, click here.Type: Upgrade version
Origin: https://github.com/containerd/containerd/security/advisories/GHSA-mvff-h3cj-wj9c
Release Date: 2022-01-05
Fix Resolution: v1.5.9
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