Bug 1843358 (CVE-2020-8558) - CVE-2020-8558 kubernetes: node localhost services reachable via martian packets
Summary: CVE-2020-8558 kubernetes: node localhost services reachable via martian packets
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2020-8558
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1845772 1845773 1845774 1845775 1845776 1845777 1845778 1845780 1845781 1849175 1857092 1860047 1860048 1860049 1860050 1860051 1860052
Blocks: 1843354
TreeView+ depends on / blocked
 
Reported: 2020-06-03 06:32 UTC by Sam Fowler
Modified: 2021-02-16 19:57 UTC (History)
26 users (show)

Fixed In Version: kubernetes 1.19.0, kubernetes 1.18.4, kubernetes 1.17.7, kubernetes 1.17.7
Clone Of:
Environment:
Last Closed: 2020-07-13 19:27:36 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2020:2412 0 None None None 2020-07-13 17:23:24 UTC
Red Hat Product Errata RHSA-2020:2413 0 None None None 2020-07-13 16:45:01 UTC
Red Hat Product Errata RHSA-2020:2926 0 None None None 2020-07-21 10:43:00 UTC
Red Hat Product Errata RHSA-2020:2927 0 None None None 2020-07-21 09:55:51 UTC
Red Hat Product Errata RHSA-2020:2992 0 None None None 2020-07-27 18:49:40 UTC
Red Hat Product Errata RHSA-2020:3183 0 None None None 2020-08-05 10:12:32 UTC
Red Hat Product Errata RHSA-2020:3184 0 None None None 2020-08-05 10:26:48 UTC

Description Sam Fowler 2020-06-03 06:32:34 UTC 
Kubernetes' kube-proxy enables net.ipv4.conf.all.route_localnet by default on all nodes. This allows neighbouring hosts on the local network to reach ports on Kubernetes nodes that are only exposed on localhost.
Comment 2 Sam Fowler 2020-06-03 06:33:33 UTC 
Upstream Issue:

https://github.com/kubernetes/kubernetes/issues/90259
Comment 6 Sam Fowler 2020-06-17 05:37:29 UTC 
Upstream Fix:

https://github.com/kubernetes/kubernetes/pull/91569
Comment 7 Sam Fowler 2020-06-17 05:37:33 UTC 
Statement:

OpenShift Container Platform does not expose the API server on a localhost port without authentication. The only service exposed on a localhost port not protected by authentication is Metrics, which exposes some cluster metadata.
Comment 9 Sam Fowler 2020-07-08 22:04:05 UTC 
External References:

https://groups.google.com/g/kubernetes-security-announce/c/B1VegbBDMTE
Comment 11 Sam Fowler 2020-07-13 02:54:43 UTC 
Acknowledgments:

Name: the Kubernetes Product Security Committee
Upstream: János Kövér (Ericsson), Rory McCune (NCC Group), Yuval Avrahami (Palo Alto Networks), Ariel Zelivansky (Palo Alto Networks)
Comment 12 Sam Fowler 2020-07-13 03:00:26 UTC 
Upstream Issue:

https://github.com/kubernetes/kubernetes/issues/92315
Comment 13 errata-xmlrpc 2020-07-13 16:44:59 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 14 errata-xmlrpc 2020-07-13 17:23:21 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
Comment 15 Product Security DevOps Team 2020-07-13 19:27:36 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-2020-8558
Comment 16 Sam Fowler 2020-07-15 06:36:40 UTC 
Created origin tracking bugs for this issue:

Affects: fedora-all [bug 1857092]
Comment 17 errata-xmlrpc 2020-07-21 09:55:47 UTC 
This issue has been addressed in the following products:

  Red Hat OpenShift Container Platform 4.4

Via RHSA-2020:2927 https://access.redhat.com/errata/RHSA-2020:2927
Comment 18 errata-xmlrpc 2020-07-21 10:42:56 UTC 
This issue has been addressed in the following products:

  Red Hat OpenShift Container Platform 4.4

Via RHSA-2020:2926 https://access.redhat.com/errata/RHSA-2020:2926
Comment 20 errata-xmlrpc 2020-07-27 18:49:37 UTC 
This issue has been addressed in the following products:

  Red Hat OpenShift Container Platform 3.11

Via RHSA-2020:2992 https://access.redhat.com/errata/RHSA-2020:2992
Comment 23 errata-xmlrpc 2020-08-05 10:12:29 UTC 
This issue has been addressed in the following products:

  Red Hat OpenShift Container Platform 4.3

Via RHSA-2020:3183 https://access.redhat.com/errata/RHSA-2020:3183
Comment 24 errata-xmlrpc 2020-08-05 10:26:45 UTC 
This issue has been addressed in the following products:

  Red Hat OpenShift Container Platform 4.3

Via RHSA-2020:3184 https://access.redhat.com/errata/RHSA-2020:3184
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