Security Bulletin: IBM SmartCloud Orchestrator - Nova compute DoS through ephemeral disk backing files (CVE-2013-6437)
By repeatedly creating snapshots, changing the os_type to a new random value, and
spawning new instances from the snapshot (and quickly deleting those instances), an authenticated user might generate lots of different ephemeral disk backing files. These files than fill up compute node disks, which potentially results in a Denial of Service against a Nova setup. Only Nova setups running the libvirt driver are affected.
CVE ID: CVE-2013-6437
OpenStack Compute (Nova) is vulnerable to a denial of service, which is caused by an error when handling an image that has os_type metadata. By creating a snapshot of instance and deleting the original instance, an attacker might exploit this vulnerability to fill the disk and cause the system to crash.
CVSS Base Score: 5.0
CVSS Temporal Score See https://exchange.xforce.ibmcloud.com/vulnerabilities/89848 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:S/C:N/I:N/A:P)
Affected Products and Versions
IBM SmartCloud Orchestrator V2.2 and 2.3
The recommended solution is to upgrade to IBM SmartCloud Orchestrator Version 2.3.0 Fix Pack 1 as soon as practical.
Workarounds and Mitigations
The exposure applies only to KVM regions.
Ensure that IBM SmartCloud Orchestrator end users do not have access to the compute nodes
Get Notified about Future Security Bulletins
ReferencesComplete CVSS v2 Guide
On-line Calculator v2
Related informationIBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog
March 31st 2014 Original Copy Published
*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.
According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES "AS IS" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.