漏洞描述

Google Kubernetes是美国谷歌（Google）公司的一套开源的Docker容器集群管理系统。该系统为容器化的应用提供资源调度、部署运行、服务发现和扩容缩容等功能。CNI Portmap Plugin是其中的一个插件。 Google Kubernetes中的CNI Portmap Plugin存在安全特征问题漏洞。该漏洞是源于网络系统或产品中缺少身份验证、访问控制、权限管理等安全措施。以下产品及版本受到影响：Google Kubernetes 1.11.9之前版本，1.12.7之前版本，1.13.5之前版本，1.14.0之前版本。

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.