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HITCON Badge 2019

Overview

HITCON Badge 2019 is based on M2351ZIAAE MCU.

Usage

There are four pages, you can use LEFT and RIGHT button on the badge to switch them.

Page 0: LED Level Display

  • Badge will show the status of 24 LEDs.
    • Locked: white color
    • Unlocked: Bright and colorful
  • Press UP + A/B to decrease/increase the brightness.
  • You can unlock each LED by playing the game or completing the mission with sponsors.

Page 1: Pattern Display

  • Use UP and DOWN button to select patterns.
  • Pattern 0 will be unlocked by unlocking led 0 1 2.
    • Pattern 1: led 3 4 5.
    • Pattern 2: led 6 7 8.
    • ..
  • If the pattern is still locked, it will render the error pattern (all LED are red).
  • There are 11 patterns in total.

Page 2: Paint Mode

  • In this page, you can customize the color of LEDs!
  • Select the LEDs by pressing UP DOWN LEFT RIGHT.
  • Change the color by pressing A B.
  • Press AB (at the same time) and then press LEFT/RIGHT to leave paint mode.

Page 3: Snake

################################
#                              #
#                              #                                   
#                              #                                   
#                              #                                   
#                              #                                   
#                              #                                   
#                              #                                   
#      @@@@@@@          o      #                                   
#                              #                                   
#                              #                                   
#                              #                                   
#                              #                                   
#                              #
#                              #
#                              # 
#                              #
################################
[Score] 6 pt
  • Let badge connect to the computor with Micro USB cable.
  • Use any client you like to connect the serial com port.
    • Linux/macOS: You can use screen command.
      • example: screen /dev/tty.usbmodemxxx (replace /dev/tty.usbmodemxxx with correct path)
    • Windows: You can use PuTTY (Connection type: Serial) to connect the COM port.
  • Control the snake by pressing UP DOWN LEFT RIGHT.
  • Press AB at the same time to pause the game.
    • Press AB again to continue the game, LEFT to exit.
  • Score
    • score >= 50, snake pattern (pattern 8) will unlocked!
    • score == 2147483647: Well done, hacker :)

Badge Command Line

  _  _ ___ _____ ___ ___  _  _   ___ __  _ ___
 | || |_ _|_   _/ __/ _ \| \| | |_  )  \/ / _ \
 | __ || |  | || (_| (_) | .` |  / / () | \_, /
 |_||_|___| |_| \___\___/|_|\_| /___\__/|_|/_/


HitconBadge2019 >>
  • There is a simple command line interface running on the badge.
  • You can use it by connecting the badge to computer with micro usb.

Commands

help

Type help for all available commands.

HitconBadge2019 >> help
show
info
unlock
setname
clear
hello
angelboy
yuawn
ping
ls
id
cat
echo
alias
whoami
help

show

Show command will display the status of all LEDs and patterns.

HitconBadge2019 >> show
Pattern 0: Lock
  led 00: Lock
  led 01: Lock
  led 02: Lock
Pattern 1: Lock
  led 03: Lock
  led 04: Lock
  led 05: Lock
Pattern 2: Lock
  led 06: Lock
  led 07: Lock
  led 08: Lock
Pattern 3: Lock
  led 09: Lock
  led 10: Lock
  led 11: Lock
Pattern 4: Lock
  led 12: Lock
  led 13: Lock
  led 14: Lock
Pattern 5: Lock
  led 15: Lock
  led 16: Lock
  led 17: Lock
Pattern 6: Lock
  led 18: Lock
  led 19: Lock
  led 20: Lock
Pattern 7: Lock
  led 21: Lock
  led 22: Lock
  led 23: Lock

Badge challenge:
[Stage 1] Snake pattern: Lock
[Stage 2] Pwned NS pattern: Lock
[Stage 3] Pwned the whole badge pattern: Lock

HITCON Badge Challenges

Badge source code, solution and exploits will be released within the talk HITCON Badge 2019 秘辛: MCU ARM TrustZone challenges at R0 (Day2 14:40 - 15:30).

There are 11 pattern in total, but three of them are special, so you need to get them in special way :)

Stage 0 - Warm Up

  • Before pwning the badge, why not play some game first.
  • Get the score higher than 50, you can unlock the snake pattern.

Stage 1 - Hack The Game

  • Try to let the score == 2147483647 by playing the game.
  • Or pwn the badge :)
  • You will know how to do it by reversing the binary of normal world (NonSecure world) in this MCU TrustZone.
  • To make life easier, the binary is not striped and not a raw binary, just take them all (See firmware/)

Stage 2 - Pwn the Badge

  • The final target is protected by TrustZone in Secure Region.
  • I put my secret in the TrustZone, it is pretty safe, isn't it?
  • Try to pwn the badge for all patterns!