Open Stack

[that was me correcting the bug type/tags a moment ago, I just forgot I
was still logged into a test account instead of this one]

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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:
  This issue is being treated as a potential security risk under
  embargo. Please do not make any public mention of embargoed (private)
  security vulnerabilities before their coordinated publication by the
  OpenStack Vulnerability Management Team in the form of an official
  OpenStack Security Advisory. This includes discussion of the bug or
  associated fixes in public forums such as mailing lists, code review
  systems and bug trackers. Please also avoid private disclosure to
  other individuals not already approved for access to this information,
  and provide this same reminder to those who are made aware of the
  issue prior to publication. All discussion should remain confined to
  this private bug report, and any proposed fixes should be added to the
  bug as attachments.

  --

  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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