CVE-2019-9946

CVE Details

Release Date:	2019-04-02
Impact:	Moderate	What is this?

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.

See more information about CVE-2019-9946 from MITRE CVE dictionary and NIST NVD

NOTE: The following CVSS metrics and score provided are preliminary and subject to review.

CVSS v3 metrics

Base Score:	7.5
Vector String:	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Version:	3.0
Attack Vector:	Network
Attack Complexity:	Low
Privileges Required:	None
User Interaction:	None
Scope:	Unchanged
Confidentiality Impact:	None
Integrity Impact:	High
Availability Impact:	None

Errata information

Platform	Errata	Release Date
Oracle Linux version 7 (kubeadm-ha-setup)	ELSA-2019-4593	2019-04-13
Oracle Linux version 7 (kubeadm-upgrade)	ELSA-2019-4593	2019-04-13
Oracle Linux version 7 (kubernetes)	ELSA-2019-4593	2019-04-13
Oracle Linux version 7 (kubernetes-cni)	ELSA-2019-4593	2019-04-13
Oracle Linux version 7 (kubernetes-cni-plugins)	ELSA-2019-4593	2019-04-13