CVE-2021-43816

HIGH8.0EPSS 0.15%

Unprivileged pod using `hostPath` can side-step active LSM when it is SELinux in github.com/containerd/containerd

發布日:2022/1/6修改日:2026/4/28

描述

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.

受影響套件(3)

Debian/containerdfrom 0, < 1.5.9~ds1-1
Go/github.com/containerd/containerd>= 1.5.0, < 1.5.9
Go/github.com/containerd/containerd>= 1.5.0, < 1.5.9

CVSS 分數

來源	版本	嚴重程度	向量
osv	CVSS 3.1	HIGH8.0	CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

描述

受影響套件(3)

CVSS 分數

參考連結(9)