Do a quick search on “people weakest link” and you’ll see a raft of articles in which cybersecurity experts and computer scientists point to employees or end users as the biggest vulnerability. No doubt, people do silly (or outright abusive) stuff and open the door for a variety of enterprise security problems. Spoiler alert: There’s this technology called the Internet of Things (IoT) and it’s a bigger security risk than people ever were. The new theme of this rapidly changing IoT security story is data integrity.
Increased cybersecurity risk is due in part to the variety of environments IoT applications touch. Most at-scale IoT deployments use some form of a three-tier architecture, with edge, gateway and cloud components.
- Edge devices are those connected sensors and actuators touching the real world. They are usually small, low-power devices often running a wireless protocol such as Bluetooth, Thread, ZigBee, Z-Wave, sub-GHz, low power wide area (LPWA) networks, cellular IoT technology, Wi-Fi or other protocol.
- Gateway devices are hubs that groups of sensors connect with. One big role of the gateway is to translate the various protocols from edge devices into Internet Protocol (IP) for transmission into an enterprise network. Gateways also perform a key role in provisioning edge devices securely. Smartphones running Android or iOS often serve as a gateway for consumer IoT devices. For industrial IoT devices, multiprotocol gateways typically are built on a small form factor computer running a real-time operating system or Linux. Edge computing or fog computing architectures use enhanced gateways for more algorithm processing.
- Cloud platforms are very familiar to most enterprise developers. In IoT apps, data from the edge arrives for processing, storage and presentation. Algorithms can run on a server cluster or in a distributed computing framework such as Hadoop or Apache Spark. Business intelligence and predictive and prescriptive analytics also reside in the cloud.
In our practice, we see many IoT cybersecurity issues that can be mitigated with proper attention to two areas. The first is shutting down simplistic endpoint attacks by using basic connected device security measures. Avoid edge devices that ship with a well-known default password or PIN—compromising those defaults can be as easy as a battery pull and a factory reset. If a device uses encryption, make sure it doesn’t use a hardcoded key that, if cracked, compromises an entire family. Look for edge devices using over-the-air (OTA) programming allowing for security updates over a long life cycle. As more device developers gain IoT security experience and provide the right features, closing these basic weakest links is easy.
Now, for the more startling weakest link. When the IoT application runs, is the data any good? According to a just-released survey of 950 IT and business decision-makers, only about 48 percent of companies are confident they can detect an IoT security breach. (BTW, don’t get me started on blockchain; it’s one tool, not a panacea.) A lot can happen before your people get involved. By then, it may be too late.
Data integrity needs constant monitoring during at-scale IoT deployment, not just during pilot. An easy way into an unprotected IoT network is to add an unauthorized edge device at a gateway, then use it to access other devices. Gaps in end-to-end encryption are also easy exploits. Untrustworthy public cloud elements are also bad news—a big reason we recommend hybrid cloud architecture. A private cloud layer gives you more control over algorithm performance and data stream security. Presentation and archiving can be left to a public cloud layer.
Bad data can come from either a compromised or faulty device. It propagates quickly across a system, and when an unwitting user at the presentation layer runs a business intelligence tool on it, the bad data could cause issues. How do teams hunt down vulnerabilities and faults that lead to corrupted data and results?
- Hire a penetration tester, preferably a contractor removed from your day-to-day development who can objectively assess your architecture during pilot and reassess it during deployment.
- Ensure your architecture can tolerate edge device or gateway failures without ripple effects in algorithms; in other words, protect the application from prolonged operation on bad data streams.
- Before turning AI loose on automated decision-making, consider an AI-based IoT security analytics tool to spot anomalies and quickly bring people into the loop.
- Retarget at least part of your cybersecurity experts to ongoing data integrity efforts and help them stay abreast of IoT technology and trends.
This all sounds like a good job for DevOps, doesn’t it? You know what to do about people; now you’ll need to work magic with devices. The long-held security axiom that people are the weakest link is no longer true when IoT applications run unattended all the way to presentation. There are a few exceptions when people have more interaction at the edge, particularly in the medical device arena. Generally, we’ll see bigger and bigger IoT applications with more data, more processing and less interaction with people.
If someone on the IoT says there’s a security hole you can drive a truck through, they may mean it literally. Data integrity measures will be critical for DevOps teams moving forward. Do you agree? What types of data integrity issues are you seeing in IoT applications?
