Bug 1692712 (CVE-2019-9946)

Summary:	CVE-2019-9946 kubernetes: Incorrect rule injection in CNI portmap plugin
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	admiller, ahardin, amurdaca, bleanhar, bmontgom, ccoleman, dbaker, dcbw, dedgar, eparis, go-sig, hchiramm, ichavero, jbrooks, jburrell, jcajka, jchaloup, jgoulding, jmulligan, jnovy, jokerman, kramdoss, lsm5, madam, mchappel, nstielau, rhs-bugs, security-response-team, sisharma, sponnaga, strigazi, tdawson, tstclair
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	kubernetes 1.11.9, kubernetes 1.12.7, kubernetes 1.13.5, kubernetes 1.14.0, containernetworking-plugins 0.7.5	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-10-27 03:27:28 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1694241, 1694242, 1694243, 1694244, 1694257, 1694258, 1694259, 1694260, 1715371, 1715389, 1715390, 1715402, 1715758
Bug Blocks:	1692721

Description Andrej Nemec 2019-03-26 09:46:08 UTC

It was found that the 'portmap' plugin, used to setup HostPorts for CNI, would insert rules at the front of the iptables nat chains; which would 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.

Upstream issue:

https://github.com/containernetworking/plugins/pull/269

Upstream patch:

https://github.com/containernetworking/plugins/pull/269/commits/f8fcb3525fc5c4a2bdc1a791b5c7b46a29ef4f04

Comment 2 Laura Pardo 2019-03-28 21:22:04 UTC

Upstream Patch:
https://github.com/kubernetes/kubernetes/pull/75455
https://github.com/containernetworking/plugins/pull/269

Comment 3 Laura Pardo 2019-03-28 21:22:07 UTC

External References:

https://discuss.kubernetes.io/t/announce-security-release-of-kubernetes-affecting-certain-network-configurations-with-cni-releases-1-11-9-1-12-7-1-13-5-and-1-14-0-cve-2019-9946/5713

Comment 10 Laura Pardo 2019-03-29 21:07:13 UTC

Created kubernetes tracking bugs for this issue:

Affects: fedora-all [bug 1694243]


Created kubernetes:1.1/kubernetes tracking bugs for this issue:

Affects: fedora-29 [bug 1694241]


Created kubernetes:openshift-3.10/origin tracking bugs for this issue:

Affects: fedora-29 [bug 1694242]


Created origin tracking bugs for this issue:

Affects: fedora-all [bug 1694244]

Comment 12 Dave Baker 2019-04-01 17:39:58 UTC

Thanks for dcbw I was able to actually confirm OCP is *NOT* affected by this.

The vulnerable code is pulled into the vendor/ section of the source tree, but this plugin is not being compiled or shipped.

Comment 13 Dave Baker 2019-04-01 18:03:10 UTC

Statement:

While this issue affects the CNI portmap plugin that is bundled with Kubernetes, it does not affect OpenShift Container Platform as the vulnerable plugin is not included.

It also does not affect the version of Kubernetes (embedded in heketi) shipped with Red Hat Gluster Storage 3 as it does not contain the vulnerable code.

Comment 17 Riccardo Schirone 2019-05-30 08:28:14 UTC

Created containernetworking-cni tracking bugs for this issue:

Affects: epel-7 [bug 1715371]

Comment 21 Riccardo Schirone 2019-05-31 07:44:06 UTC

Created containernetworking-plugins tracking bugs for this issue:

Affects: fedora-all [bug 1715758]