Greg White, director, security operations, ServiceNow
Greg White, director, security operations, ServiceNow

Many businesses today count on the cloud to run their day-to-day operations. What they don't count on is being more susceptible to a data breach.

When it comes to protecting their data, today's business leaders need to know their information is always protected and secure. Given the high stakes involved, a multi-layered approach to cloud security is no longer an option, it's a requirement.

Confidence in the cloud does not come easily to everyone. The lack of complete transparency and control can make some businesses question their ability to manage operations while keeping all of the information safe.

Some businesses have even considered building private clouds with the idea that this would give them the control they want, but the high costs and potential for security and operational issues make this an unappealing option.

Luckily, by using a multi-layered approach to cloud security, cloud service providers can meet customers halfway, providing the highest levels of security while maintaining more visibility into the operations and increased control.

When looking at cloud security options, businesses need to take a hard look at the provider because not all cloud security is created equal. They should ensure that all bases are covered including the baseline infrastructure, physical security standards, control and access requirements and incident response processes.

Finally, as no security solution is perfect, service providers should also have strict operational controls and well thought out processes and procedures in place for when the inevitable security issues come up.

Baseline infrastructure

In order to provide a secure cloud infrastructure, start with a multi-instance architecture in which every customer instance has its own database. All routers, switches, firewalls and server-load balancers should be redundant throughout the infrastructure.

Additional security such as intrusion detection systems (IDS) and distributed denial-of-service (DDoS) protection at each location is necessary to quickly detect, alert and remediate suspicious activity. In the end, a cloud infrastructure should be built in a similar way to how a traditional enterprise data centre is structured, with high availability, performance and security at the forefront.

Physical security

Without physical security at every data centre location, cloud service providers can do little to ensure their customers' data is secure. Each location should have multiple security measures in place, such as purpose-built buildings, 24/7 surveillance, security guards and biometric scanners (palm and fingerprint).

It should be very difficult to get into a cloud service provider's data centre, even when authorised to do so. Only fully vetted and full-time personnel ought to be allowed into the data centre and appropriate safeguards should be in place to ensure that only those individuals are allowed entry.

Physical security may be compromised through unexpected methods, including third-party or contractors used to perform equipment installation or hardware maintenance.

Access and controls

As mentioned above, it should be difficult for those even with authorisation to have access to the data centre. However, beyond physical access, the cloud service provider should have strict controls on who can access the network and server infrastructure.

All access should require at least a secure virtual private network (VPN) connection using multi-factor authentication and one-time passwords. In addition, read-write access to infrastructure devices should be granted to very few individuals with strict adherence to change management processes including clearance guidelines from the Site Reliability Engineering (SRE) team.

Audit logs of all login access and transactions on the instance is another requirement for the secure operation and appropriate monitoring of the enterprise cloud security.

Incident response

Even the most secure cloud will encounter threats. Part of any cloud security design should be the procedures that will be carried out when a security incident occurs.

Consider who is in charge, and how the issue should be managed including all communications. Ideally, every cloud service provider would have a security incident handling process and a response team trained with clear roles and responsibilities with workflows defined for detecting, researching, communicating and resolving any incidents.

Once the processes are in place, companies shouldn't wait for an emergency to make sure their incident response plan is up to the task. To ensure the process goes smoothly, regular tests should be performed during times that are not considered mission critical.

Successful operation of the enterprise cloud requires multiple layers of protection. Using physical security, strict operational controls, and a secure cloud infrastructure, customers will have the confidence they need to operate successfully and securely in the cloud.

* Contributed by Greg White, director, security operations, ServiceNow

The views expressed in this blog are those of the author and do not necessarily reflect the views of SC Media or Haymarket Media.