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Overview

This course introduces and explores attacks on several different relatively accessible interfaces on embedded systems. Attendees will get hands-on experience implementing and deploying a number of low-cost hardware devices to enable access, privilege, and deception which is in some cases imperceptible from software.

The course has several modules. Each begins with an architectural overview of an interface, and follows with a series of labs for hands-on practice understanding, observing, interacting with, and exploiting the interface, finishing with either potentially exploitable crashes or directly to root shells.

Depending on allotted time, topic interest, and class pace, not all topics will be covered completely, but all materials are included for reference and individual practice.

Targets

This course targets a MIPS-based network router, and multiple ARM-based mobile and IOT devices. Together they are representative of a wide range of embedded devices that span consumer electronics, medical devices, industrial control hardware, and mobile devices. While there are many shared concepts and tools, the content of Applied Physical Attacks on x86 Systems stands on its own and is more relevant to fully-featured desktops, servers, and laptops.

Length

2-3 days

Audience:

This course is geared toward pen testers, developers and others with a security background who wish to learn how to take advantage of physical access to systems to assist and enable other attacks. No hardware or electrical background is required. Computer architecture knowledge and low-level programming experience helpful but not required.

Format:

20% lecture

70% Lab

10% discussion

Outline:

  1. UART
    • Background: UART History, Architecture, and Uses
    • UART Lab 1: Connecting to a known UART
    • UART Lab 2: Identifying and analyzing an unknown UART
    • UART Lab 3: Escalating and persisting UART privelage
  2. JTAG
    • Background: JTAG History and Purpose
    • JTAG Lab 1: Hardware and Software Setup
    • JTAG Lab 2: Escalating Privilege via Kernel
    • JTAG Lab 3: Escalating Privilege via a Process
  3. SPI
    • Background: Flash storage and the SPI interface
    • SPI Lab 1: Accessing Flash from software
    • SPI Lab 2: Sniffing and Parsing SPI
    • SPI Lab 3: Dumping SPI from Hardware
    • SPI Lab 4: Firmware Analysis
  4. Firmware
    • Background: More types of Flash, Storage, and Firmware
    • Firmware Lab 1: Dumping Firmware from Software
    • Firmware Lab 2: Manipulating firmware images
    • Firmware Lab 3: Finding software bugs in firmware

Advanced

Applied Physical Attacks and Hardware Pentesting picks up where this course leaves off, and covers more in-depth topics, as well as how to fit hardware targets into standard pentest workflow.