It is often effective to deploy traditional security philosophies to new environments, and one of the “good” words we want more of in security is “visibility.” Whether by utilizing satellites to review national borders or installing video cameras in ATM kiosks, the idea is to have an “eye” watching over it all — with intelligence — to identify threats and mitigate them in time. A hacker focuses on finding the blind spots of the eye or disabling the eye itself.
Virtualization is one of the main components of the cloud. A virtual environment provides flexibility, allows optimization of the workloads running in the cloud and provides an essential benefit by detaching this workload from the underlying hardware. Virtualization can also be viewed as having invisible, miniature data centers that include virtual switches (vSwitches) and traffic that flows between these vSwitches. Being invisible to the physical eye, virtualization is a frequently ignored area within the cloud. Physical networks are monitored and have network protection solutions inspecting traffic; however, the traffic between vSwitches goes invisible, making it a sweet spot for hackers.
Why Is It a Risk?
In cloud environments, workloads and virtual machines (VMs) are working continuously to achieve optimal utilization or performance. This also means that infected workloads or VMs could be circulating. Therefore, logical network segmentation and security setting become imperative for cloud security. If one infected VM is communicating with another VM over the virtual layer, physical network protection solutions are not monitoring these communications and are consequently unable to disrupt the threats embedded within them. With the advanced persistent threat approach, attackers watch and wait for such opportunities.
How Do You Address It?
The answer is straightforward: Deploy that much-required visibility to monitor inter-vSwitch traffic as you would with other network traffic. There are different approaches to achieve this, one being to route inter-VM traffic through the physical network protection appliance already available on your network. This could be a tedious process, however, and could lead to a few performance concerns. A much more effective way of managing this would be to use a virtual appliance that sits on the virtual layer and is able to monitor and prevent threats within inter-vSwitch traffic and to provide logical network segmentation security settings.