CVE-2019-9946 Information

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.

CVSS Vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Reference

https://access.redhat.com/errata/RHBA-2019:0862 https://github.com/containernetworking/plugins/pull/269issuecomment-477683272 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FCN66VYB3XS76SYH567SO7N3I254JOCT/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SGOOWAELGH3F7OXRBPH3HCNZELNLXYTW/ https://security.netapp.com/advisory/ntap-20190416-0002/

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

HIGH

Base Score

NONE

Base Severity

7.5