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Bug 1405336 - (CVE-2016-9592) CVE-2016-9592 openshift: Failing to detach a volume causes DoS by retrying to perform delete
CVE-2016-9592 openshift: Failing to detach a volume causes DoS by retrying to...
Status: CLOSED NOTABUG
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20161219,repor...
: Security
Depends On: 1470268
Blocks: 1405337
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Reported: 2016-12-16 03:53 EST by Adam Mariš
Modified: 2018-04-04 01:47 EDT (History)
19 users (show)

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Fixed In Version: openshift 3.3.1.11, openshift 3.2.1.23, openshift 3.4
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Doc Text:
A flaw was found where a volume fails to detach, which causes the delete operation to fail with 'VolumeInUse' error. Since the delete operation is retried every 30 seconds for each volume, this could lead to a denial of service attack as the number of API requests being sent to the cloud-provider exceeds the API's rate-limit.
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Last Closed: 2018-04-04 01:47:00 EDT
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Description Adam Mariš 2016-12-16 03:53:50 EST 
It was found that when a volume fails to detach for any reason, the delete operation is retried forever, whereas the detach operation does not seem to try to detach more than once. This causes the delete to fail each time with 'VolumeInUse' error. The delete operation occurs every 30 seconds for each volume, which is causing a denial of service as the number of API requests being sent to the cloud-provider exceeds the API's rate-limit.

Product bug:

https://bugzilla.redhat.com/show_bug.cgi?id=1404032
Comment 1 Kurt Seifried 2016-12-19 22:17:10 EST 
Changed CVSSv2/3 scores to reflect only a partial DoS rather then a full DoS.
Comment 3 Jason Shepherd 2018-04-04 01:45:33 EDT 
This was fixed by a patch to 3.3, and 3.2 here: https://access.redhat.com/errata/RHBA-2017:0199
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