NetSight
IP …
high7.5

CVE-2019-9946

Cloud Native Computing Foundation (CNCF) CNI (Container Networking Interface) 0.7.4 has a network firewall misconfiguration which affects Kubernetes.

Impact

Cloud Native Computing Foundation (CNCF) CNI (Container Networking Interface) 0.7.4 has a network firewall misconfiguration which affects Kubernetes. The CNI 'portmap' plugin, used to setup HostPorts for CNI, inserts rules at the front of the iptables nat chains; which take precedence over the KUBE- SERVICES chain. Because of this, the HostPort/portmap rule could match incoming traffic even if there were better fitting, more specific service definition rules like NodePorts later in the chain. The issue is fixed in CNI 0.7.5 and Kubernetes 1.11.9, 1.12.7, 1.13.5, and 1.14.0.

Affected products

VendorProductAffected versions
CncfPortmap
before 0.7.5
KubernetesKubernetes
before 1.11.9
from 1.12.0 before 1.12.7
from 1.13.0 before 1.13.5
Versions 1.13.6, 1.14.0
NetappCloud Insights
All versions

Weakness classification

CWE-670

References