CVE-2021-3918
Description
The json-schema Node.JS library was vulnerable to prototype pollution during the validation of a JSON object. An attacker, able to provide a specially crafted JSON file for validation, could use this flaw to modify the behavior of the node program, to, for example, execute arbitrary code.
Statement
npm versions 8.0.0 and older provide a vulnerable version of the json-schema library. However, it is currently believed that in the context of npm, it is not possible to take advantage of the vulnerability.
Red Hat Enterprise Linux version 8 and Software Collections provide a vulnerable version of the json-schema library only as embedded in the npm package. As a result, the severity of the incident has been lowered for these 2 products.
Red Hat Quay includes json-schema as a development dependency of quay-registry-container. As a result, the impact rating has been lowered to Moderate.
In Red Hat OpenShift Container Platform (RHOCP), Red Hat Openshift Data Foundations (ODF), Red Hat distributed tracing, Migration Toolkit for Virtualization (MTV) and Red Hat Advanced Cluster Management for Kubernetes (RHACM) the affected components are behind OpenShift OAuth. This restricts access to the vulnerable json-schema library to authenticated users only, therefore the impact is reduced to Moderate.
In Red Hat Openshift Data Foundations (ODF) the odf4/mcg-core-rhel8 component has "Will not fix status", but starting from ODF 4.11 stream this component contains already patched version of the json-schema library. Earlier version of ODF are already under Maintenance Support phase, hence this vulnerability will not be fixed.
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).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 9.8 | 9.8 | 9.8 |
| Attack Vector | Network | Network | Network |
| Attack Complexity | Low | Low | Low |
| Privileges Required | None | None | None |
| User Interaction | None | None | None |
| Scope | Unchanged | Unchanged | Unchanged |
| Confidentiality | High | High | High |
| Integrity Impact | High | High | High |
| Availability Impact | High | High | High |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
cve.org: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Understanding the Weakness (CWE)
Integrity
Technical Impact: Modify Application Data
An attacker could modify sensitive data or program variables.
Integrity
Technical Impact: Execute Unauthorized Code or Commands
Other,Integrity
Technical Impact: Varies by Context; Alter Execution Logic
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