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CVE-2021-25741

Good to know:

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Date: September 20, 2021

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. After conducting further research, Mend has determined that all versions of kubernetes up to version v1.19.15,v1.20.11,v1.21.5,v1.22.1 are vulnerable to CVE-2021-25741.

Language: Go

Severity Score

Related Resources (9)

https://github.com/kubernetes/kubernetes
https://security-tracker.debian.org/tracker/CVE-2021-25741
https://nvd.nist.gov/vuln/detail/CVE-2021-25741
https://groups.google.com/g/kubernetes-security-announce/c/nyfdhK24H7s
https://security.netapp.com/advisory/ntap-20211008-0006
https://security.netapp.com/advisory/ntap-20211008-0006/
https://github.com/bottlerocket-os/bottlerocket/security/advisories/GHSA-f5f7-6478-qm6p
https://github.com/kubernetes/kubernetes/issues/104980
https://www.mend.io/vulnerability-database/CVE-2021-25741

Severity Score

Weakness Type (CWE)

Files or Directories Accessible to External Parties

CWE-552

Improper Input Validation

CWE-20

Top Fix

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Upgrade Version

Upgrade to version k8s.io/kubernetes - v1.19.15;k8s.io/kubernetes - v1.20.11;k8s.io/kubernetes - v1.21.5;k8s.io/kubernetes - v1.22.2

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): LOW
Authentication (AU): SINGLE
Confidentiality (C): PARTIAL
Integrity (I): PARTIAL
Availability (A): NONE
Additional information:

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