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[Bug 1125468] Re: [OSSA 2013-008] DOS by allocating all fixed ips

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Sean Dague <sean@xxxxxxxxx>
Date: Fri, 19 Sep 2014 10:54:06 -0000
Reply-to: Bug 1125468 <1125468@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

** No longer affects: nova/essex

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https://bugs.launchpad.net/bugs/1125468

Title:
  [OSSA 2013-008] DOS by allocating all fixed ips

Status in OpenStack Compute (Nova):
  Fix Released
Status in OpenStack Compute (nova) folsom series:
  Fix Released
Status in OpenStack Security Advisories:
  Fix Released

Bug description:
  When using FlatDHCP networking it is possible for a user to use up all
  of the fixed ips by repeatedly calling addFixedIp to an instance.

  Repro case allocating 100 fixed ips:

  nova boot --flavor=1 --image=<image> foo
  for i in {1..100}; do
    nova add-fixed-ip foo
  done

  When all ips are exhausted it is impossible for anyone to boot a vm

  Note this is possible in vlan mode, but it would only DOS a single
  tenant in this case.

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