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.
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 ESM (Trusty Tahr):DNE
Ubuntu 16.04 LTS (Xenial Xerus):DNE
Ubuntu 18.04 LTS (Bionic Beaver):DNE
Ubuntu 20.04 LTS (Focal Fossa):needs-triage
Ubuntu 20.10 (Groovy Gorilla):needs-triage
More Information

Updated: 2020-10-24 07:00:59 UTC (commit 69e225d81a6ee3e2e014950178db797c5d4e5009)