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[Openstack-security] [Bug 1841933] Re: Fetching metadata via LB may result with wrong instance data


** Changed in: nova
     Assignee: Kobi Samoray (ksamoray) => Adit Sarfaty (asarfaty)

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https://bugs.launchpad.net/bugs/1841933

Title:
  Fetching metadata via LB may result with wrong instance data

Status in OpenStack Compute (nova):
  In Progress
Status in OpenStack Security Advisory:
  Won't Fix

Bug description:
  While querying metadata from an instance via a loadbalancer, metadata service relies on X-Metadata-Provider to identify the correct instance by querying Neutron for subnets which are attached to the loadbalancer.
  Then the subnet result is used to identify the instance by querying for ports which are attached to the subnets above.
  Yet, when the first query result is empty due to deletion, bug or any other reason within the Neutron side, this may cause a security vulnerability, as Neutron will retrieve ports of _any_ instance which has the same IP address as the instance which is queried.
  That could compromise key pairs and other sensitive data.

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