Open Stack

** Changed in: nova
     Assignee: Tony Breeds (o-tony) => (unassigned)

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https://bugs.launchpad.net/bugs/1563954

Title:
  use_forwarded_for exposes metadata

Status in OpenStack Compute (nova):
  Confirmed
Status in OpenStack Security Advisory:
  Opinion
Status in OpenStack Security Notes:
  Fix Released

Bug description:
  The nova metadata service uses the remote address to determine which
  metadata to retrieve. In order to work behind a proxy there is an
  option use_forwarded_for which will use the X-Forwarded-For header to
  determine the remote IP.

  If this option is set then anyone who can access the metadata port can
  request metadata for any instance if they know the IP.

  The user data is also exposed.

  $ echo 123456 > /tmp/data
  $ openstack server create --image CentOS7 --flavor fedora --user-data /tmp/data test
  <wait>
  $ curl -H 'X-Forwarded-For: 10.0.0.7' http://localhost:8775/latest/user-data/
  123456

  At a minimum this side-effect isn't documented anywhere I could find.

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