Bug 1405336 (CVE-2016-9592) - CVE-2016-9592 openshift: Failing to detach a volume causes DoS by retrying to perform delete
Summary: CVE-2016-9592 openshift: Failing to detach a volume causes DoS by retrying to...
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2016-9592
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: 1470268
Blocks: 1405337
TreeView+ depends on / blocked
 
Reported: 2016-12-16 08:53 UTC by Adam Mariš
Modified: 2019-09-29 14:02 UTC (History)
19 users (show)

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.
Clone Of:
Environment:
Last Closed: 2018-04-04 05:47:00 UTC
Embargoed:

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Description Adam Mariš 2016-12-16 08:53:50 UTC 
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 2016-12-20 03:17:10 UTC 
Changed CVSSv2/3 scores to reflect only a partial DoS rather then a full DoS.
Comment 3 Jason Shepherd 2018-04-04 05:45:33 UTC 
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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