CVE-2021-25741 : A security issue was discovered in Kubernetes where a user may be able to create

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.

Published 2021-09-20 17:15:08

Updated 2021-11-30 22:42:34

Source Kubernetes

View at NVD, CVE.org

Vulnerability category: Input validation

Products affected by CVE-2021-25741

Kubernetes » Kubernetes
Versions up to, including, (<=) 1.19.14
cpe:2.3:a:kubernetes:kubernetes:*:*:*:*:*:*:*:*
Matching versions
Kubernetes » Kubernetes
Versions from including (>=) 1.22.0 and up to, including, (<=) 1.22.1
cpe:2.3:a:kubernetes:kubernetes:*:*:*:*:*:*:*:*
Matching versions
Kubernetes » Kubernetes
Versions from including (>=) 1.20.0 and up to, including, (<=) 1.20.10
cpe:2.3:a:kubernetes:kubernetes:*:*:*:*:*:*:*:*
Matching versions
Kubernetes » Kubernetes
Versions from including (>=) 1.21.0 and up to, including, (<=) 1.21.4
cpe:2.3:a:kubernetes:kubernetes:*:*:*:*:*:*:*:*
Matching versions

Exploit prediction scoring system (EPSS) score for CVE-2021-25741

EPSS FAQ

29.00%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 96 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-25741

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
5.5	MEDIUM	AV:N/AC:L/Au:S/C:P/I:P/A:N	8.0	4.9	NIST
Access Vector: Network Access Complexity: Low Authentication: Single Confidentiality Impact: Partial Integrity Impact: Partial Availability Impact: None
8.8	HIGH	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	2.8	5.9	Kubernetes
Attack Vector: Network Attack Complexity: Low Privileges Required: Low User Interaction: None Scope: Unchanged Confidentiality: High Integrity: High Availability: High
8.1	HIGH	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N	2.8	5.2	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: Low User Interaction: None Scope: Unchanged Confidentiality: High Integrity: High Availability: None

CWE ids for CVE-2021-25741

CWE-20 Improper Input Validation

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

Assigned by: jordan@liggitt.net (Secondary)
CWE-552 Files or Directories Accessible to External Parties

The product makes files or directories accessible to unauthorized actors, even though they should not be.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2021-25741

https://groups.google.com/g/kubernetes-security-announce/c/nyfdhK24H7s

[Security Advisory] CVE-2021-25741: Symlink Exchange Can Allow Host Filesystem Access
Mailing List;Mitigation
https://security.netapp.com/advisory/ntap-20211008-0006/

CVE-2021-25741 Kubernetes Vulnerability in NetApp Products | NetApp Product Security
Third Party Advisory
https://github.com/kubernetes/kubernetes/issues/104980

CVE-2021-25741: Symlink Exchange Can Allow Host Filesystem Access · Issue #104980 · kubernetes/kubernetes · GitHub
Mitigation;Third Party Advisory

Jump to

Vulnerability Details : CVE-2021-25741

Products affected by CVE-2021-25741

Exploit prediction scoring system (EPSS) score for CVE-2021-25741

CVSS scores for CVE-2021-25741

CWE ids for CVE-2021-25741

References for CVE-2021-25741