Johnson Controls/DigiCert have designed a new way of managing PKI certification for IoT devices through their partnership and integration of the DigiCert ONE™ PKI management platform and the Johnson Controls OpenBlue IoT device platform. Based on an advanced, container-based design, DigiCert ONE allows organisations to implement robust PKI deployment and management in any environment, roll out new services and manage users and devices across your organisation at any scale no matter the stage of their lifecycle. This creates an operational synergy within the Operational Technology (OT) and IoT spaces to ensure that hardware, software and communication remains trusted throughout the lifecycle.
Rationale on the Role of Certification in IoT Management
Digital certificates ensure the integrity of data and device communications through encryption and authentication, ensuring that transmitted data are genuine and have not been altered or tampered with. With government regulations worldwide mandating secure transit (and storage) of PII data, PKI can help ensure compliance with the regulations by securing the communication channel between the device and the gateway.
Connected IoT devices interact with each other through machine to machine (M2M) communication. Each of these billions of interactions will require authentication of device credentials for the endpoints to prove the device’s digital identity. In such scenarios, an identity management approach based on passwords or passcodes is not practical, and PKI digital certificates are by far the best option for IoT credential management today.
Creating lifecycle management for connected devices, including revocation of expired certificates, is another example where PKI can help to secure IoT devices. Having a robust management platform that enables device management, revocation and renewal of certificates is a critical component of a successful PKI. IoT devices will also need regular patches and upgrades to their firmware, with code signing being critical to ensure the integrity of the downloaded firmware – another example of the close linkage between the IoT world and the PKI world.
PKI certification benefits both people and processes. PKI enables identity assurance while digital certificates validate the identity of the connected device. Use of PKI for IoT is a necessary trend for sense of trust in the network and for quality control of device management.
Identifying the IoT device is critical in managing its lifespan and recognizing its legitimacy in the network. Building in the ability for PKI at the device’s manufacture is critical to enable the device for its lifetime. By recognizing a device, information on it can be maintained in an inventory and its lifecycle and replacement can be better managed. Once a certificate has been distributed and certified, having the control of PKI systems creates life-cycle management.
What is ransomware? Well, it’s a type of malware that specialises in encrypting the victim’s data and demands a ransom for a decryption key which may or may not work. If the victim fails to pay, their data could be sold or published online. More worryingly, if the victim pays, their data could still be sold or published online, prolonging the agony. Common ransomware families include REvil, Locky, Wannacry, Cerber, NotPetya, Maze and Darkside.
Why is Ransomware Becoming more Widespread?
Increased digitisation, remote working, accelerated adoption of cloud computing and growth in IoT devices, have expanded the attack surface for threat actors – offering more vulnerabilities that can be exploited. Launching a ransomware attack is a relatively easy and low-risk way to make money for cyber-criminals. Threat actors are usually outside the jurisdiction where the attack takes place and are typically protected by the absence of extradition treaties between the country where the crime occurred and the country from where the attack was launched. As well as posing a remarkably low risk to the attacker the rewards from a successful ransomware attack are potentially very large. Ransomware as a service (RaaS) kits can be purchased on the dark web for a few hundred dollars and if used repeatedly are likely to find at least one victim. Cryptocurrencies such as bitcoin make it virtually impossible for law enforcement authorities to track ransom payments. Consequently, the rapid growth in ransoms combined with the increasing risk of successful ransomware attacks is leading to banks stocking up on bitcoin. This allows their customers to quickly pay ransoms.
How to Mitigate the Risks?
Companies will not be able to completely eliminate the risk of ransomware attacks. They can, however, mitigate the risk of these attacks with a zero-trust approach to cybersecurity, renewed focus on training and awareness programs, and well-prepared and rehearsed incident response plans.
Rigorously applying the principle of least privilege will make it harder for threat actors to gain the credentials that they need to move laterally within systems and networks. Segmenting networks and isolating workloads will limit the blast radius of attacks. Training and awareness campaigns will make employees less likely to download malware via phishing attacks or other social engineering activities. Ensuring that all sensitive data is classified and encrypted will make double extortion more difficult – a miserable scenario where the victim pays a ransom for a decryption key and is then asked to pay a further ransom for the dubious promise that stolen data will not be leaked.
Protecting against supply chain ransomware attacks, such as the Kaseya breach, is fiendishly difficult. In the case of Kaseya, attackers identified a zero-day vulnerability in its VSA IT management and monitoring tool. An update was then infected with ransomware and shared with managed service providers, who, in turn infected their customers with the ransomware.
Rehearsed incident response plans that prepare for a successful ransomware attack are essential controls against such threats. A critical component of such a plan is backup and recovery. Backups are increasingly being targeted in well-orchestrated attacks so companies must find ways of ensuring that their data is stored in at least one immutable destination. This means that they can recover quickly – often almost instantly if the process is automated.
If companies follow cybersecurity best practices such as those outlined above, they should be able to manage ransomware risk and the misery associated with these attacks. If a ransomware attack occurs, well-prepared companies will be able to recover rapidly and be comfortable in the knowledge that the data which has been stolen is of little or no value to the attackers.