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Incomplete List of Disallowed Inputs in Kubernetes

Moderate severity GitHub Reviewed Published Sep 7, 2021 to the GitHub Advisory Database • Updated Feb 1, 2023

Package

gomod k8s.io/kubernetes (Go)

Affected versions

>= 1.16.0, < 1.18.19
>= 1.19.0, < 1.19.11
>= 1.20.0, < 1.20.7
= 1.21.0

Patched versions

1.18.19
1.19.11
1.20.7
1.21.1

Description

A security issue was discovered in Kubernetes where a user may be able to redirect pod traffic to private networks on a Node. Kubernetes already prevents creation of Endpoint IPs in the localhost or link-local range, but the same validation was not performed on EndpointSlice IPs.

References

Published by the National Vulnerability Database Sep 6, 2021
Reviewed Sep 7, 2021
Published to the GitHub Advisory Database Sep 7, 2021
Last updated Feb 1, 2023

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
High
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

EPSS score

0.060%
(27th percentile)

Weaknesses

CVE ID

CVE-2021-25737

GHSA ID

GHSA-mfv7-gq43-w965

Source code

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