Description

Attify badge is a hardware tool that allows you to interact with various hardware interfaces and ports such as UART, SPI, I2C, JTAG, GPIO and so on. 

• Look for a 4 or 3 pins or pads which are in a block together.

• In order to perform UART based exploitation, we need to correctly identify four pins namely – Tx, Rx, GND and Vcc.

• To identify the individual pins, a multi-meter is required. Start off by connecting the black probe and the red probe of the multimeter to the device GND and the ground pin of Attify badge respectively. Reiterate till you hear a beep sound.

• VCC can be ignored for our case, since it is not needed for a UART based exploitation.

• By using a multimeter as ohmmeter, an infinite resistance between the TX and VCC pin will be noticed. This can also be determined by a huge variation or fluctuation in the voltage as soon as we power on the device.

• Rx can be determined by the pin having the lowest voltage during the entire process, with having the black probe connected to the GND of the Attify badge.

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SPI memory dumping on IoT device

 

JTAG exploitation

 

We won’t go much in-depth into the basics of JTAG over here, maybe we will do that in another blog post. Stay tuned for future blog updates.

 

One of the first steps in JTAG exploitation is identifying the pinouts for JTAG. This could be done in different ways – either you could use JTAGulator (the recommended and reliable method), or use something like Arduino loaded up with JTAGenum.

 

Once you have identified the JTAG pinouts, you can then go ahead and start debugging using OpenOCD and JTAG (something which we will cover in upcoming posts) – some screenshots below.