title: Kubernetes node setting allows for neighboring hosts to bypass localhost boundary
description: The Kubelet and kube-proxy components in versions 1.1.0-1.16.10, 1.17.0-1.17.6, and 1.18.0-1.18.3 were found to contain a security issue which allows adjacent hosts to reach TCP and UDP services bound to 127.0.0.1 running on the node or in the node's network namespace. Such a service is generally thought to be reachable only by other processes on the same host, but due to this defeect, could be reachable by other hosts on the same LAN as the node, or by containers running on the same node as the service.
problem types: CWE-420 Unprotected Alternate Channel
affected:
{
product: Kubernetes
vendor: Kubernetes
versions:
status: affected, version: prior to 1.18.4
status: affected, version: prior to 1.17.7
status: affected, version: prior to 1.16.11
status: affected, version: 1.15
status: affected, version: 1.14
status: affected, version: 1.13
status: affected, version: 1.12
status: affected, version: 1.11
status: affected, version: 1.10
status: affected, version: 1.9
status: affected, version: 1.8
status: affected, version: 1.7
status: affected, version: 1.6
status: affected, version: 1.5
status: affected, version: 1.4
status: affected, version: 1.3
status: affected, version: 1.2
status: affected, version: 1.1
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: ADJACENT_NETWORK
availabilityImpact: NONE
baseScore: 5.4
baseSeverity: MEDIUM
confidentialityImpact: LOW
integrityImpact: LOW
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
version: 3.1
]