Red Hat Security Advisory 2015-0938-01 – 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. Multiple flaws were found in the glance task API that could cause untracked image data to be left in the back end. A malicious user could use these flaws to deliberately accumulate untracked image data, and cause a denial of service via resource exhaustion.