CVE-2021-25748

A security issue was discovered in ingress-nginx where a user that can create or update ingress objects can use a newline character to bypass the sanitization of the `spec.rules[].http.paths[].path` field of an Ingress object (in the `networking.k8s.io` or `extensions` API group) to obtain the credentials of the ingress-nginx controller. In the default configuration, that credential has access to all secrets in the cluster.

CVSS v3 6.5 MEDIUM

6.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/kubernetes/ingress-nginx/issues/8686	Issue Tracking Mitigation Vendor Advisory
https://groups.google.com/g/kubernetes-security-announce/c/avaRYa9c7I8	Mailing List Mitigation Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:kubernetes:ingress-nginx:*:*:*:*:*:*:*:*

History

01 Jun 2023, 20:44

Type	Values Removed	Values Added
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 6.5
References	~~(MISC) https://github.com/kubernetes/ingress-nginx/issues/8686 -~~	(MISC) https://github.com/kubernetes/ingress-nginx/issues/8686 - Issue Tracking, Mitigation, Vendor Advisory
References	~~(MISC) https://groups.google.com/g/kubernetes-security-announce/c/avaRYa9c7I8 -~~	(MISC) https://groups.google.com/g/kubernetes-security-announce/c/avaRYa9c7I8 - Mailing List, Mitigation, Vendor Advisory
First Time		Kubernetes Kubernetes ingress-nginx
CWE		NVD-CWE-noinfo
CPE		cpe:2.3:a:kubernetes:ingress-nginx::::::::

24 May 2023, 17:15

Type	Values Removed	Values Added
New CVE

Information

Published : 2023-05-24 17:15

Updated : 2023-12-10 15:01

NVD link : CVE-2021-25748

Mitre link : CVE-2021-25748

CVE.ORG link : CVE-2021-25748

JSON object : View

Products Affected

kubernetes

ingress-nginx

CWE

NVD-CWE-noinfo CWE-20

Improper Input Validation

{"id": "CVE-2021-25748", "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.5, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 3.6, "exploitabilityScore": 2.8}, {"type": "Secondary", "source": "jordan@liggitt.net", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.6, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "LOW", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 4.7, "exploitabilityScore": 2.8}]}, "published": "2023-05-24T17:15:09.253", "references": [{"url": "https://github.com/kubernetes/ingress-nginx/issues/8686", "tags": ["Issue Tracking", "Mitigation", "Vendor Advisory"], "source": "jordan@liggitt.net"}, {"url": "https://groups.google.com/g/kubernetes-security-announce/c/avaRYa9c7I8", "tags": ["Mailing List", "Mitigation", "Vendor Advisory"], "source": "jordan@liggitt.net"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}, {"type": "Secondary", "source": "jordan@liggitt.net", "description": [{"lang": "en", "value": "CWE-20"}]}], "descriptions": [{"lang": "en", "value": "A security issue was discovered in ingress-nginx where a user that can create or update ingress objects can use a newline character to bypass the sanitization of the `spec.rules[].http.paths[].path` field of an Ingress object (in the `networking.k8s.io` or `extensions` API group) to obtain the credentials of the ingress-nginx controller. In the default configuration, that credential has access to all secrets in the cluster."}], "lastModified": "2023-06-01T20:44:14.080", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:kubernetes:ingress-nginx:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E43BDC85-F198-4126-B487-21F6C3667561", "versionEndExcluding": "1.2.1"}], "operator": "OR"}]}], "sourceIdentifier": "jordan@liggitt.net"}