CVE-2021-43816

NameCVE-2021-43816
Descriptioncontainerd 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
containerd (PTS)bullseye (security), bullseye1.4.13~ds1-1~deb11u2fixed
bookworm, sid1.6.6~ds1-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
containerdsourcebullseye(not affected)
containerdsource(unstable)1.5.9~ds1-1

Notes

[bullseye] - containerd <not-affected> (Vulnerable code introduced in 1.5.0)
https://github.com/containerd/containerd/security/advisories/GHSA-mvff-h3cj-wj9c
Fixed by: https://github.com/containerd/containerd/commit/1407cab509ff0d96baa4f0eb6ff9980270e6e620

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