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Improper Enforcement of Behavioral Workflow Affecting containernetworking-plugins package, versions <0:0.8.1-2.module+el8.1.0+4081+b29780af

Severity

 Recommended
high

Based on CentOS security rating.

Threat Intelligence

EPSS
0.23% (63rd percentile)

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  • Snyk IDSNYK-CENTOS8-CONTAINERNETWORKINGPLUGINS-1948158
  • published26 Jul 2021
  • disclosed28 Mar 2019
Report a new vulnerability Found a mistake?

Introduced: 28 Mar 2019

CVE-2019-9946  (opens in a new tab)
CWE-841  (opens in a new tab)

How to fix?

Upgrade Centos:8 containernetworking-plugins to version 0:0.8.1-2.module+el8.1.0+4081+b29780af or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream containernetworking-plugins package and not the containernetworking-plugins package as distributed by Centos. See How to fix? for Centos:8 relevant fixed versions and status.

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.

References