Red Hat Security Advisory 2015-0838-01 – OpenStack Image service provides discovery, registration, and delivery services for disk and server images. It provides the ability to copy or snapshot a server image, and immediately store it away. Stored images can be used as a template to get new servers up and running quickly and more consistently than installing a server operating system and individually configuring additional services. A storage quota bypass flaw was found in OpenStack Image. If an image was deleted while it was being uploaded, it would not count towards a user’s quota. A malicious user could use this flaw to deliberately fill the backing store, and cause a denial of service.