[Openstack-security] [Bug 1841933] Re: Fetching metadata via LB may result with wrong instance data
Agreed on C1 for this.
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Fetching metadata via LB may result with wrong instance data
Status in OpenStack Compute (nova):
Status in OpenStack Security Advisory:
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
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bug as attachments.
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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