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Kubernetes: CVE-2019-9946: Cloud Native Computing Foundation (CNCF) CNI (Container Networking Interface) Network Firewall Misconfiguration

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Kubernetes: CVE-2019-9946: Cloud Native Computing Foundation (CNCF) CNI (Container Networking Interface) Network Firewall Misconfiguration

Severity
5
CVSS
(AV:N/AC:L/Au:N/C:N/I:P/A:N)
Published
04/02/2019
Created
04/22/2019
Added
04/16/2019
Modified
06/03/2019

Description

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.

Solution(s)

  • kubernetes-upgrade-1_11_9
  • kubernetes-upgrade-1_12_7
  • kubernetes-upgrade-1_13_5

References

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