4/9/2023 0 Comments Start vpn x server purdueIT networks for business users at local sites. Enterprise Security Operations Centre (SOC).Customer Relationship Management (CRM) systems.These systems are usually located in corporate data centres. These connections provide access to devices residing at Levels 3 and below of the Purdue Enterprise Reference Architecture, which we covered in depth in Part Two of this series:Ĭorporate-level services supporting individual business units and users. To clarify, the remote connections to which we’re referring are connections from the Internet and/or an organization’s business network into its OT environment. Remote Access in the Purdue Enterprise Reference Architecture However, there are best practices to follow for remote connections into ICS that greatly reduce the likelihood of successful attacks and ensure that threat actors are spotted and stopped before gaining access to critical operational technology. Unfortunately, they have been a critical factor in several successful, high-profile cyber-attacks in recent years, including the Dragonfly campaign of 2014, the Ukraine power grid attack in 2015, and the Oldsmar incident of 2021. So remote connections into ICS are here to stay. Remote access is also preferable for ongoing management of ICS located at remote field sites because it enables one technician to manage several sites, maximizing his/her efficiency. For example, when an organization needs to check, reprogram, or update their ICS, flying a vendor technician to the site from another location is far less preferable than having the technician remotely connect to the equipment to immediately perform the work with no travel cost. The benefits of remote access connections into ICS are so significant that many organizations now rely on these types of connections in their day-to-day operations. Subsequently, they have become high-value targets to threat groups. As discussed in Part One of this series, however, the persistence of this mindset into the Internet era must be overcome, as ICS environments are now more connected and relied upon for real-time operational data. As a result, network security measures were not major considerations for ICS. Prior to the arrival of the Internet, the ICS/OT environment at most organizations was “air-gapped”, meaning it had no connections to external networks. The Importance of Remote Access Connections into ICS Immediately apply the skills and techniques learned in SANS courses, ranges, and summits
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