Vulnerabilities > CVE-2019-9946 - Always-Incorrect Control Flow Implementation vulnerability in multiple products
Attack vector
NETWORK Attack complexity
LOW Privileges required
NONE Confidentiality impact
NONE Integrity impact
HIGH Availability impact
NONE Summary
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.
Vulnerable Configurations
Common Weakness Enumeration (CWE)
Nessus
NASL family PhotonOS Local Security Checks NASL id PHOTONOS_PHSA-2019-2_0-0148_KUBERNETES.NASL description An update of the kubernetes package has been released. last seen 2020-06-01 modified 2020-06-02 plugin id 124861 published 2019-05-14 reporter This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/124861 title Photon OS 2.0: Kubernetes PHSA-2019-2.0-0148 NASL family Fedora Local Security Checks NASL id FEDORA_2019-D2B57D3B19.NASL description Resolves: #1715758 - CVE-2019-9946 Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-06-01 modified 2020-06-02 plugin id 125867 published 2019-06-13 reporter This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/125867 title Fedora 30 : containernetworking-plugins (2019-d2b57d3b19) NASL family Fedora Local Security Checks NASL id FEDORA_2019-24217ABFDF.NASL description Resolves: #1715758 - CVE-2019-9946 Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-06-01 modified 2020-06-02 plugin id 125932 published 2019-06-17 reporter This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/125932 title Fedora 29 : containernetworking-plugins (2019-24217abfdf)
Redhat
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References
- https://github.com/containernetworking/plugins/pull/269#issuecomment-477683272
- https://security.netapp.com/advisory/ntap-20190416-0002/
- https://access.redhat.com/errata/RHBA-2019:0862
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FCN66VYB3XS76SYH567SO7N3I254JOCT/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SGOOWAELGH3F7OXRBPH3HCNZELNLXYTW/