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Bug 1525130 - (CVE-2017-1002101) CVE-2017-1002101 kubernetes: Volume security can be sidestepped with innocent emptyDir and subpath
CVE-2017-1002101 kubernetes: Volume security can be sidestepped with innocent...
Status: MODIFIED
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
high Severity high
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Assigned To: Red Hat Product Security
impact=important,public=20180312,repo...
: Security
Depends On: 1519365 1520626 1520627 1520631 1554165 1554166 1554420 1554569
Blocks: 1525132
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Reported: 2017-12-12 11:34 EST by Andrej Nemec
Modified: 2018-06-29 18:30 EDT (History)
34 users (show)

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It was found that volume security can be sidestepped with innocent emptyDir and subpath. This could give an attacker with access to a pod full control over the node host by gaining access to docker socket.
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RHEL 7.3 requirements from Atomic Host:
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External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2018:0475 normal SHIPPED_LIVE Important: Red Hat OpenShift Container Platform security update 2018-03-12 19:40:44 EDT

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Description Andrej Nemec 2017-12-12 11:34:42 EST 
It was found that volume security can be sidestepped with innocent emptyDir and subpath. A pod could give full control over node host by gaining access to docker socket.
Comment 2 Kurt Seifried 2018-03-12 12:06:36 EDT 
Created kubernetes tracking bugs for this issue:

Affects: fedora-all [bug 1554420]
Comment 3 errata-xmlrpc 2018-03-12 15:38:27 EDT 
This issue has been addressed in the following products:

  Red Hat OpenShift Container Platform 3.3
  Red Hat OpenShift Container Platform 3.4
  Red Hat OpenShift Container Platform 3.5
  Red Hat OpenShift Container Platform 3.6
  Red Hat OpenShift Container Platform 3.7

Via RHSA-2018:0475 https://access.redhat.com/errata/RHSA-2018:0475
Comment 4 Jason Shepherd 2018-03-12 18:17:39 EDT 
This flaw allows a pod to mount any part of the host filesystem. The pod will run with the security contraints placed on the user but could read anything with o=rx mode and appropriate SELinux label.
Comment 5 Jason Shepherd 2018-03-12 18:29:39 EDT 
External References:

https://github.com/kubernetes/kubernetes/issues/60813
Comment 7 Jason Shepherd 2018-03-12 20:17:56 EDT 
Created origin tracking bugs for this issue:

Affects: fedora-all [bug 1554569]
Comment 10 Jason Shepherd 2018-03-13 21:11:10 EDT 
Statement:

This flaw allows a pod to mount any part of the host filesystem. The pod will run with the security contraints placed on the user but could read anything with o=rx mode and appropriate SELinux label.
Comment 11 Cedric Buissart 2018-04-10 05:56:34 EDT 
Kubernetes has been deprecated from Red Hat Enterprise Linux Extras channel. See https://access.redhat.com/errata/RHSA-2018:1072 for details.
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