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CVE-2019-9946

7.5 · HIGH

Cloud Native Computing Foundation (CNCF) CNI (Container Networking Interface) 0.7.4 has a network firewall misconfiguration which affects Kubernetes.

Published Apr 2, 2019CWE-670EPSS 3.16%

Overview

CVE-2019-9946 is a high-severity vulnerability. It was published on April 2, 2019 and has a CVSS 3.0 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.0 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refaccess.redhat.com/errata/RHBA-2019:0862GitHubgithub.com/containernetworking/plugins/pull/269#issuecomment-477683272Reflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FCN66VYB3XS76SYH567SO7N3I254JOCT/Reflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SGOOWAELGH3F7OXRBPH3HCNZELNLXYTW/Refsecurity.netapp.com/advisory/ntap-20190416-0002/Refaccess.redhat.com/errata/RHBA-2019:0862GitHubgithub.com/containernetworking/plugins/pull/269#issuecomment-477683272Reflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FCN66VYB3XS76SYH567SO7N3I254JOCT/Reflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SGOOWAELGH3F7OXRBPH3HCNZELNLXYTW/Refsecurity.netapp.com/advisory/ntap-20190416-0002/

How CyberStrike helps

Frequently asked questions

What is CVE-2019-9946?

CVE-2019-9946 is a high-severity vulnerability. It was published on April 2, 2019 and has a CVSS 3.0 base score of 7.5 (HIGH).

How severe is CVE-2019-9946?

This vulnerability has a CVSS 3.0 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2019-9946?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2019-9946?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2019-9946 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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