CVE-2021-25736

Kube-proxy on Windows can unintentionally forward traffic to local processes listening on the same port (“spec.ports[*].port”) as a LoadBalancer Service when the LoadBalancer controller does not set the “status.loadBalancer.ingress[].ip” field. Clusters where the LoadBalancer controller sets the “status.loadBalancer.ingress[].ip” field are unaffected.

CVSS v3 6.3 MEDIUM

6.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.8 / Impact : 4.0

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://github.com/kubernetes/kubernetes/pull/99958	Third Party Advisory
https://groups.google.com/g/kubernetes-security-announce/c/lIoOPObO51Q/m/O15LOazPAgAJ	Mailing List Third Party Advisory
https://security.netapp.com/advisory/ntap-20231221-0003/

Configurations

Configuration 1 (hide)

AND

OR	cpe:2.3:a:kubernetes:kubernetes::::::::
	cpe:2.3:a:kubernetes:kubernetes::::::::
	cpe:2.3:a:kubernetes:kubernetes::::::::

cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*

History

21 Dec 2023, 22:15

Type	Values Removed	Values Added
References		() https://security.netapp.com/advisory/ntap-20231221-0003/ -

16 Nov 2023, 16:01

Type	Values Removed	Values Added
First Time		Microsoft windows Microsoft Kubernetes Kubernetes kubernetes
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 6.3
CPE		cpe:2.3:o:microsoft:windows:-:::::::* cpe:2.3:a:kubernetes:kubernetes::::::::
CWE		NVD-CWE-noinfo
References	~~(MISC) https://groups.google.com/g/kubernetes-security-announce/c/lIoOPObO51Q/m/O15LOazPAgAJ -~~	(MISC) https://groups.google.com/g/kubernetes-security-announce/c/lIoOPObO51Q/m/O15LOazPAgAJ - Mailing List, Third Party Advisory
References	~~(MISC) https://github.com/kubernetes/kubernetes/pull/99958 -~~	(MISC) https://github.com/kubernetes/kubernetes/pull/99958 - Third Party Advisory

30 Oct 2023, 03:15

Type	Values Removed	Values Added
New CVE

Information

Published : 2023-10-30 03:15

Updated : 2023-12-21 22:15

NVD link : CVE-2021-25736

Mitre link : CVE-2021-25736

CVE.ORG link : CVE-2021-25736

JSON object : View

Products Affected

microsoft

windows

kubernetes

kubernetes

CWE

NVD-CWE-noinfo

{"id": "CVE-2021-25736", "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 6.3, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 4.0, "exploitabilityScore": 1.8}, {"type": "Secondary", "source": "jordan@liggitt.net", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 5.8, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "HIGH", "confidentialityImpact": "HIGH"}, "impactScore": 4.0, "exploitabilityScore": 1.3}]}, "published": "2023-10-30T03:15:07.653", "references": [{"url": "https://github.com/kubernetes/kubernetes/pull/99958", "tags": ["Third Party Advisory"], "source": "jordan@liggitt.net"}, {"url": "https://groups.google.com/g/kubernetes-security-announce/c/lIoOPObO51Q/m/O15LOazPAgAJ", "tags": ["Mailing List", "Third Party Advisory"], "source": "jordan@liggitt.net"}, {"url": "https://security.netapp.com/advisory/ntap-20231221-0003/", "source": "jordan@liggitt.net"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}], "descriptions": [{"lang": "en", "value": "Kube-proxy\n on Windows can unintentionally forward traffic to local processes \nlistening on the same port (\u201cspec.ports[*].port\u201d) as a LoadBalancer \nService when the LoadBalancer controller\n does not set the \u201cstatus.loadBalancer.ingress[].ip\u201d field. Clusters \nwhere the LoadBalancer controller sets the \n\u201cstatus.loadBalancer.ingress[].ip\u201d field are unaffected.\n\n"}, {"lang": "es", "value": "Kube-proxy en Windows puede reenviar tr\u00e1fico involuntariamente a procesos locales que escuchan en el mismo puerto (\u201cspec.ports[*].port\u201d) que LoadBalancer Service cuando el controlador LoadBalancer no configura \u201cstatus.loadBalancer.ingress[].ip\u201d. Los cl\u00fasteres donde el controlador LoadBalancer establece el campo \"status.loadBalancer.ingress[].ip\" no se ven afectados."}], "lastModified": "2023-12-21T22:15:07.533", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:kubernetes:kubernetes:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "8E811D79-831A-493A-A0C8-D06442D01ADD", "versionEndExcluding": "1.18.18", "versionStartIncluding": "1.18.0"}, {"criteria": "cpe:2.3:a:kubernetes:kubernetes:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "54F99BEF-703E-43C0-846C-AB9EECE134A9", "versionEndExcluding": "1.19.10", "versionStartIncluding": "1.19.0"}, {"criteria": "cpe:2.3:a:kubernetes:kubernetes:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E26E82C1-754C-4E81-B7BC-FB4DACE33945", "versionEndExcluding": "1.20.6", "versionStartIncluding": "1.20.0"}], "operator": "OR"}, {"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*", "vulnerable": false, "matchCriteriaId": "A2572D17-1DE6-457B-99CC-64AFD54487EA"}], "operator": "OR"}], "operator": "AND"}], "sourceIdentifier": "jordan@liggitt.net"}