OSSN/OSSN-0078

copy_from in Image Service API v1 allows network port scan

Summary

The `copy_from` feature in Image Service API v1 supplied by Glance can allow an attacker to perform masked network port scans.

Affected Services / Software

Version 1 of the Glance Image Service (deprecated in Newton).

Discussion

In Version 1 of the Glance Image Service API it is possible to create images with a URL such as `http://localhost:22`. This could then allow an attacker to enumerate internal network details while appearing masked, since the scan would appear to originate from the Glance image service.

Recommended Actions

Version 1 of the Glance Image Service API was deprecated in the Newton cycle, so operators should upgrade to a later version that will allow use of Version 2.

Existing deployments can limit policy on `copy_from` by restricting use to `admin` within `policy.json` as follows:

   "copy_from": "role:admin"

Contacts / References

Author: Luke Hinds, Red Hat

This OSSN : https://wiki.openstack.org/wiki/OSSN/OSSN-0078

Original LaunchPad Bug : https://bugs.launchpad.net/ossn/+bug/1606495

OpenStack Security Project : https://launchpad.net/~openstack-ossg