CVE-2021-20278

Description

An authentication bypass vulnerability was found in Kiali when the authentication strategy OpenID is used. When RBAC is enabled, Kiali assumes that some of the token validation is handled by the underlying cluster. When OpenID implicit flow is used with RBAC turned off, this token validation doesn't occur, and this allows a malicious user to bypass the authentication.

Statement

OpenShift ServiceMesh (OSSM) Kiali is configured to delegate authorization to the OpenShift's RBAC user rights and the OpenID authentication strategy is not supported, therefore it is marked 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 HatNVDcve.org
Base Score7.26.5N/A
Attack VectorNetworkNetworkN/A
Attack ComplexityLowLowN/A
Privileges RequiredNoneNoneN/A
User InteractionNoneNoneN/A
ScopeChangedUnchangedN/A
ConfidentialityLowLowN/A
Integrity ImpactLowLowN/A
Availability ImpactNoneNoneN/A

Vector

Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

NVD: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Understanding the Weakness (CWE)

CWE-290

Access Control

Technical Impact: Bypass Protection Mechanism; Gain Privileges or Assume Identity

This weakness can allow an attacker to access resources which are not otherwise accessible without proper authentication.

Acknowledgements

Red Hat would like to thank the Kiali Security Group for reporting this issue.

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