CVE-2019-9946: High severity portmap vulnerability
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.
Affected Software
Remediation
Patch Available
Event History
Frequently Asked Questions
What is the severity of CVE-2019-9946?
The severity of CVE-2019-9946 is high with a severity value of 7.5.
Which software is affected by CVE-2019-9946?
The affected software includes Cloud Native Computing Foundation (CNCF) CNI (Container Networking Interface) 0.7.4 and Kubernetes versions up to 1.13.5.
What is the vulnerability in CVE-2019-9946?
The vulnerability in CVE-2019-9946 is a network firewall misconfiguration in the CNI 'portmap' plugin.
How can I fix CVE-2019-9946?
To fix CVE-2019-9946, update to CNI version 0.7.5 or later and Kubernetes version 1.13.6 or later.
Where can I find more information about CVE-2019-9946?
More information about CVE-2019-9946 can be found at the following references: [Reference 1](https://access.redhat.com/errata/RHBA-2019:0862), [Reference 2](https://github.com/containernetworking/plugins/pull/269#issuecomment-477683272), [Reference 3](https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FCN66VYB3XS76SYH567SO7N3I254JOCT/).