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Files or Directories Accessible to External Parties in kubernetes

High severity GitHub Reviewed Published Sep 17, 2021 in bottlerocket-os/bottlerocket • Updated Feb 1, 2023

Package

gomod k8s.io/kubernetes (Go)

Affected versions

< 1.19.15
>= 1.20.0, < 1.20.11
>= 1.21.0, < 1.21.5
>= 1.22.0, < 1.22.2

Patched versions

1.19.15
1.20.11
1.21.5
1.22.2

Description

A security issue was discovered in Kubernetes where a user may be able to create a container with subpath volume mounts to access files & directories outside of the volume, including on the host filesystem.

References

@tjkirch tjkirch published to bottlerocket-os/bottlerocket Sep 17, 2021
Published by the National Vulnerability Database Sep 20, 2021
Reviewed Nov 1, 2021
Published to the GitHub Advisory Database Nov 1, 2021
Last updated Feb 1, 2023

Severity

High

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
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
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:L/UI:N/S:U/C:H/I:H/A:N

EPSS score

0.100%
(42nd percentile)

Weaknesses

CVE ID

CVE-2021-25741

GHSA ID

GHSA-f5f7-6478-qm6p

Source code

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