title: Holes in EndpointSlice Validation Enable Host Network Hijack
description: A security issue was discovered in Kubernetes where a user may be able to redirect pod traffic to private networks on a Node. Kubernetes already prevents creation of Endpoint IPs in the localhost or link-local range, but the same validation was not performed on EndpointSlice IPs.
problem types: CWE-184 Incomplete Blacklist
affected:
{
product: Kubernetes
vendor: Kubernetes
versions:
lessThanOrEqual: 1.18.18, status: affected, version: unspecified, versionType: custom
lessThanOrEqual: 1.19.10, status: affected, version: unspecified, versionType: custom
lessThanOrEqual: 1.20.6, status: affected, version: unspecified, versionType: custom
lessThanOrEqual: 1.21.0, status: affected, version: unspecified, versionType: custom
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: NONE
baseScore: 2.7
baseSeverity: LOW
confidentialityImpact: LOW
integrityImpact: NONE
privilegesRequired: HIGH
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N
version: 3.1
]