Current Research

Publications

  • Nicholas DeMarinis, Rodrigo Fonseca. Toward Usable Network Traffic Policies for IoT Devices in Consumer Networks. ACM Workshop on IoT Security and Privacy (IoTSP), Nov 2017.
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    The Internet of Things (IoT) revolution has brought millions of small, low-cost, connected devices into our homes, cities, infrastructure, and more. However, these devices are often plagued by security vulnerabilities that pose threats to user privacy or can threaten the Internet architecture as a whole. Home networks can be particularly vulnerable to these threats as they typically have no network administrator and often contain unpatched or otherwise vulnerable devices.
    In this paper, we argue that the unique security challenges of home networks require a new network-layer architecture to both protect against external threats and mitigate attacks from compromised devices. We present initial findings based on traffic analysis from a small-scale IoT testbed toward identifying predictable patterns in IoT traffic that may allow construction of a policy-based framework to restrict malicious traffic. Based on our observations, we discuss key features for the design of this architecture to promote future developments in network-layer security in smart home networks.
  • Tim Nelson, Nicholas DeMarinis, Timothy Adam Hoff, Rodrigo Fonseca, Shriram Krishnamurthi. Switches are Monitors Too! Stateful Property Monitoring as a Switch Design Criterion. ACM Workshop on Hot Topics in Software Defined Networking (HotNets), Nov 2016.
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    Testing and debugging networks in situ is notoriously difficult. Many vital correctness properties involve histories over multiple packets (e.g., prior established connections). Checking such properties requires cross-packet state, which cannot be fully captured on stateless switch hardware.
    Recent SDN work is enabling limited switch operations on persistent state. We present runtime checking of cross-packet correctness properties as a unique and instructive use case for developing stateful switch primitives. In this paper, we examine a set of cross-packet properties and distill from them switch features needed to monitor their correctness. We then contrast these against features provided by current approaches to switch state in SDNs and identify semantic gaps with an eye toward informing future switch instruction sets.

Technical Reports

  • Nick DeMarinis, Stefanie Tellex, Vasileios Kemerlis, George Konidaris, Rodrigo Fonseca. Scanning the Internet for ROS: A View of Security in Robotics Research. ArXiv ePrint, July 2018.
    [] [Link] [Website] [Wired]
    Because robots can directly perceive and affect the physical world, security issues take on particular importance. In this paper, we describe the results of our work on scanning the entire IPv4 address space of the Internet for instances of the Robot Operating System (ROS), a widely used robotics platform for research. Our results identified that a number of hosts supporting ROS are exposed to the public Internet, thereby allowing anyone to access robotic sensors and actuators. As a proof of concept, and with consent, we were able to read image sensor information and move the robot of a research group in a US university. This paper gives an overview of our findings, including the geographic distribution of publicly-accessible platforms, the sorts of sensor and actuator data that is available, as well as the different kinds of robots and sensors that our scan uncovered. Additionally, we offer recommendations on best practices to mitigate these security issues in the future.
  • Tim Nelson, Nicholas DeMarinis, Timothy Adam Hoff, Rodrigo Fonseca, Shriram Krishnamurthi. Compiling Stateful Network Properties for Runtime Verification. ArXiv ePrint, July 2016.
    [] [Link]
    Networks are difficult to configure correctly, and tricky to debug. These problems are accentuated by temporal and stateful behavior. Static verification, while useful, is ineffectual for detecting behavioral deviations induced by hardware faults, security failures, and so on, so dynamic property monitoring is also valuable. Unfortunately, existing monitoring and runtime verification for networks largely focuses on properties about individual packets (such as connectivity) or requires a digest of all network events be sent to a server, incurring enormous cost.
    We present a network monitoring system that avoids these problems. Because traces of network events correspond well to temporal logic, we use a subset of Metric First-Order Temporal Logic as the query language. These queries are compiled down to execute completely on the network switches. This vastly reduces network load, improves the precision of queries, and decreases detection latency. We show the practical feasibility of our work by extending a widely-used software switch and deploying it on networks. Our work also suggests improvements to network instruction sets to better support temporal monitoring.