Bug 1492101 (CVE-2017-1002100)

Summary: CVE-2017-1002100 kubernetes: Incorrect default access permissions for Persistent Volumes
Product: [Other] Security Response Reporter: Adam Mariš <amaris>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED WONTFIX QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: bleanhar, ccoleman, dedgar, dmcphers, eparis, ichavero, jbrooks, jcajka, jchaloup, jgoulding, jkeck, kseifried, lsm5, nhorman, tstclair, vbatts
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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Fixed In Version: kubernetes 1.6.6 Doc Type: If docs needed, set a value
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Clone Of: Environment:
Last Closed: 2018-04-10 11:41:06 UTC Type: ---
Regression: --- Mount Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On:    
Bug Blocks: 1492102    

Description Adam Mariš 2017-09-15 13:07:54 UTC 
A vulnerability has been disclosed in which default access permissions for Persistent Volumes (PVs) created by the Kubernetes Azure cloud provider in versions 1.6.0 to 1.6.5 are set to "container" which exposes a URI that can be accessed without authentication on the public internet. Access to the URI string requires privileged access to the Kubernetes cluster or authenticated access to the Azure portal.

Only Kubernetes 1.6.0-1.6.5 installations that have Persistent Volumes (PVs) actively provisioned through the Azure cloud provider are subject to the vulnerability. Clusters without PVs are unaffected. No other form of cluster storage is impacted.

An individual with the full URI of an actively provisioned persistent volume can download the VHD file for that volume. It does not apply retroactively to volumes already deleted from the cluster.

Upstream bug:

https://github.com/kubernetes/kubernetes/issues/47611

Upstream patch:

https://github.com/kubernetes/kubernetes/pull/47605