CVE-2021-21334
Description
A flaw was found in containerd CRI plugin. Containers launched through containerd's CRI implementation that share the same image may receive incorrect environment variables, including values that are defined for other containers. The highest threat from this vulnerability is to data confidentiality.
Statement
Whilst in OpenShift Container Platform (OCP) there are containers which contain a vulnerable version containerd, they do not import the code from https://github.com/containerd/containerd/tree/master/pkg/cri and hence are not vulnerable to this flaw.
OpenShift Virtualization vendors in containerd in some containers, however none of them depend on it and do not import the code from https://github.com/containerd/containerd/tree/master/pkg/cri and hence are not vulnerable to this flaw.
Red Hat Advanced Cluster Management for Kubernetes (RHACM) includes containerd for the multicloud operators subscription. However, the CRI plugin is not being used in this component, hence RHACM is not affected by this flaw.
Red Hat Quay's builder, and setup operators do make use of the containerd module, but not the vulnerable cri plugin. Therefore they are not affected.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 6.3 | 6.3 | 6.3 |
| Attack Vector | Network | Network | Network |
| Attack Complexity | High | High | High |
| Privileges Required | Low | Low | Low |
| User Interaction | None | None | None |
| Scope | Changed | Changed | Changed |
| Confidentiality | High | High | High |
| Integrity Impact | None | None | None |
| Availability Impact | None | None | None |
Vector
Red Hat: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
NVD: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
cve.org: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
Understanding the Weakness (CWE)
Confidentiality
Technical Impact: Read Application Data
Frequently Asked Questions
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