CVE-2015-5286

OpenStack Image Service (Glance) en versiones anteriores a 2014.2.4 (juno) y 2015.1.x en versiones anteriores a 2015.1.2 (kilo) permite a usuarios remotos autenticados eludir la cuota de almacenamiento y provocar una denegación de servicio (consumo de disco) borrando imágenes que han sido subidas utilizando un token que expira durante el proceso. NOTA: esta vulnerabilidad existe debido a una solución incompleta para CVE-2014-9623.

A race-condition flaw was discovered in the OpenStack Image service (glance). When images in the upload state were deleted using a token close to expiration, untracked image data could accumulate in the back end. Because untracked data does not count towards the storage quota, an attacker could use this flaw to cause a denial of service through resource exhaustion.

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 flaw was discovered in the OpenStack Image service where a tenant could manipulate the status of their images by submitting an HTTP PUT request together with an 'x-image-meta-status' header. A malicious tenant could exploit this flaw to reactivate disabled images, bypass storage quotas, and in some cases replace image contents. Setups using the Image service's v1 API could allow the illegal modification of image status. Additionally, setups which also use the v2 API could allow a subsequent re-upload of image contents.