Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2021-43816

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
05/01/2022
Last modified:
07/11/2023

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.

Impact

Vector 3.x
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 9.10 CRITICAL
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): High
User Interaction (UI): None
Scope (S): Changed
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x
9.10
Severity 3.x
CRITICAL
Vector 2.0
AV:N/AC:M/Au:S/C:P/I:P/A:P CVSS v2.0 Severity and Metrics:

Base Score: 6.00 MEDIUM
Vector: AV:N/AC:M/Au:S/C:P/I:P/A:P

Attack Vector (AV): Network
Attack Complexity (AC): Medium
Authentication (Au): Single
Confidentiality (C): Physical
Integrity (I): Physical
Availability (A): Physical

Base Score 2.0
6.00
Severity 2.0
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:a:linuxfoundation:containerd:*:*:*:*:*:*:*:* 1.5.1 (including) 1.5.9 (excluding)
cpe:2.3:a:linuxfoundation:containerd:1.5.0:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:containerd:1.5.0:beta0:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:containerd:1.5.0:beta1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:containerd:1.5.0:beta2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:containerd:1.5.0:beta3:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:containerd:1.5.0:beta4:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:containerd:1.5.0:rc0:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:containerd:1.5.0:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:containerd:1.5.0:rc2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:containerd:1.5.0:rc3:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools