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.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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)

Note that Nessus relies on the presence of the package as reported by the vendor.

The remote Fedora 36 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2022-6f630b1ba7 advisory.

    Automatic update for containerd-1.5.9-1.fc36.

    ##### **Changelog**

    ```
    * Mon Jan 31 2022 Maxwell G <gotmax@e.email> - 1.5.9-1
    - Update to 1.5.9. Fixes FTBFS. Closes rhbz#2045277.
    - Mitigates CVE-2021-43816. Closes rhbz#2044434. Closes rhbz#2044436.
    - Temporarily build using vendored dependencies.
    * Wed Jan 19 2022 Fedora Release Engineering <releng@fedoraproject.org> - 1.5.8-2
    - Rebuilt for https://fedoraproject.org/wiki/Fedora_36_Mass_Rebuild

    ```

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

An update of the fuse package has been released.

ID	Name	Product	Family	Severity
258741	Linux Distros Unpatched Vulnerability : CVE-2021-43816	Nessus	Misc.	critical
211321	Fedora 36 : containerd (2022-6f630b1ba7)	Nessus	Fedora Local Security Checks	critical
203774	Photon OS 3.0: Fuse PHSA-2023-3.0-0618	Nessus	PhotonOS Local Security Checks	critical
203509	Photon OS 4.0: Fuse PHSA-2023-4.0-0429	Nessus	PhotonOS Local Security Checks	critical

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CVE-2021-43816

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