Open Stack

Related fix proposed to branch: master
Review: https://review.openstack.org/399728

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https://bugs.launchpad.net/bugs/1268751

Title:
  Potential token revocation abuse via group membership

Status in OpenStack Identity (keystone):
  Won't Fix
Status in OpenStack Security Advisory:
  Won't Fix
Status in OpenStack Security Notes:
  Fix Released

Bug description:
  If a group is deleted, all tokens for all users that are a member of
  that group are revoked.  This leads to potential abuse:

  1.  A group admin adds a user to a group without users knowledge
  2. User creates token
  3. Admin  deletes group.  
  4.  All of the users tokens are revoked.

  Admittedly, this abuse must be instigated by a group admin, which is
  the global admin in the default policy file, but an alternative policy
  file could allow for the delegation of "add user to group" behavior.
  In such a system, this could act as a denial of service attack for a
  set of users.

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