Bug 1819486 (CVE-2019-11254)

Summary:	CVE-2019-11254 kubernetes: Denial of service in API server via crafted YAML payloads by authorized users
Product:	[Other] Security Response	Reporter:	Sam Fowler <sfowler>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	alegrand, anpicker, aos-bugs, bmontgom, dominik.mierzejewski, eparis, erooth, jburrell, jesusr, jokerman, kakkoyun, lcosic, mfojtik, mloibl, nstielau, pkrupa, sponnaga, sttts, surbania
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	kubernetes 1.17.3, kubernetes 1.16.7, kubernetes 1.15.10	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-06-18 23:20:28 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:	1820449, 1820450, 1820452, 1820453, 1820454, 1820458, 1820459
Bug Blocks:	1819487

Description Sam Fowler 2020-04-01 00:20:34 UTC

A denial of service vulnerability was found in the kube-apiserver, allowing authorized users sending malicious YAML payloads to cause kube-apiserver to consume excessive CPU cycles while parsing YAML.


Upstream Issue:

https://github.com/kubernetes/kubernetes/issues/89535

Comment 1 Sam Fowler 2020-04-01 00:22:33 UTC

External References:

https://groups.google.com/forum/#!topic/kubernetes-security-announce/wuwEwZigXBc

Comment 2 Sam Fowler 2020-04-01 00:24:26 UTC

Mitigation:

Prevent unauthenticated or unauthorized access to the API server

Comment 5 Sam Fowler 2020-04-01 06:44:27 UTC

Go yaml fix:

https://github.com/go-yaml/yaml/pull/555

Comment 10 Sam Fowler 2020-05-12 05:22:30 UTC

- openshift4/ose-openshift-state-metrics-rhel7 does not accept YAML payloads
- openshift4/ose-k8s-prometheus-adapter only exposes a read-only API

Comment 11 Sam Fowler 2020-05-12 05:22:33 UTC

Statement:

The upstream Kubernetes fix for this vulnerability is to update the version of the Go dependency, gopkg.in/yaml.v2. This issue affects OpenShift Container Platform components that use versions before 2.2.8 of gopkg.in/yaml.v2 and accept YAML payloads.

Comment 12 errata-xmlrpc 2020-06-18 21:11:28 UTC

This issue has been addressed in the following products:

  Red Hat OpenShift Container Platform 3.11

Via RHSA-2020:2479 https://access.redhat.com/errata/RHSA-2020:2479

Comment 13 Product Security DevOps Team 2020-06-18 23:20:28 UTC

This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2019-11254

Comment 14 errata-xmlrpc 2020-07-13 16:44:58 UTC

This issue has been addressed in the following products:

  Red Hat OpenShift Container Platform 4.5

Via RHSA-2020:2413 https://access.redhat.com/errata/RHSA-2020:2413

Comment 15 errata-xmlrpc 2020-07-13 17:23:12 UTC

This issue has been addressed in the following products:

  Red Hat OpenShift Container Platform 4.5

Via RHSA-2020:2412 https://access.redhat.com/errata/RHSA-2020:2412