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238 lines
6.3 KiB
Markdown
238 lines
6.3 KiB
Markdown
# I2C
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{% hint style="success" %}
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Learn & practice AWS Hacking:<img src="/.gitbook/assets/arte.png" alt="" data-size="line">[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)<img src="/.gitbook/assets/arte.png" alt="" data-size="line">\
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Learn & practice GCP Hacking: <img src="/.gitbook/assets/grte.png" alt="" data-size="line">[**HackTricks Training GCP Red Team Expert (GRTE)**<img src="/.gitbook/assets/grte.png" alt="" data-size="line">](https://training.hacktricks.xyz/courses/grte)
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<details>
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<summary>Support HackTricks</summary>
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* Check the [**subscription plans**](https://github.com/sponsors/carlospolop)!
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* **Join the** 💬 [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** us on **Twitter** 🐦 [**@hacktricks\_live**](https://twitter.com/hacktricks\_live)**.**
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* **Share hacking tricks by submitting PRs to the** [**HackTricks**](https://github.com/carlospolop/hacktricks) and [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repos.
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</details>
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{% endhint %}
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## Bus Pirate
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To test a Bus Pirate is working, connect +5V with VPU and 3.3V with ADC and access the bus pirate (Using Tera Term for example) and use the command `~`:
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```bash
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# Use command
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HiZ>~
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Disconnect any devices
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Connect (Vpu to +5V) and (ADC to +3.3V)
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Space to continue
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# Press space
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Ctrl
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AUX OK
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MODE LED OK
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PULLUP H OK
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PULLUP L OK
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VREG OK
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ADC and supply
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5V(4.96) OK
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VPU(4.96) OK
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3.3V(3.26) OK
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ADC(3.27) OK
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Bus high
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MOSI OK
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CLK OK
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MISO OK
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CS OK
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Bus Hi-Z 0
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MOSI OK
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CLK OK
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MISO OK
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CS OK
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Bus Hi-Z 1
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MOSI OK
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CLK OK
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MISO OK
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CS OK
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MODE and VREG LEDs should be on!
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Any key to exit
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#Press space
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Found 0 errors.
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```
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As you can see in the previous command line it said that it found 0 errors. This is very useful to know it's working after buying it or after flashing a firmware.
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To connect with the bus pirate you can follow the docs:
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.png>)
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In this case I'm going to connect to an EPROM: ATMEL901 24C256 PU27:
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.png>)
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To talk with bus pirate I used Tera Term connected to the pirate bus COM port with a Setup --> Serial Port --> Speed of 115200.\
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In the following communication you can find how to prepare the bus pirate to talk I2C and how to write and read from the memory (Comments appear using "#", don't expect that part in the communication):
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```bash
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# Check communication with buspirate
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i
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Bus Pirate v3.5
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Community Firmware v7.1 - goo.gl/gCzQnW [HiZ 1-WIRE UART I2C SPI 2WIRE 3WIRE KEYB LCD PIC DIO] Bootloader v4.5
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DEVID:0x0447 REVID:0x3046 (24FJ64GA00 2 B8)
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http://dangerousprototypes.com
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# Check voltages
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I2C>v
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Pinstates:
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1.(BR) 2.(RD) 3.(OR) 4.(YW) 5.(GN) 6.(BL) 7.(PU) 8.(GR) 9.(WT) 0.(Blk)
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GND 3.3V 5.0V ADC VPU AUX SCL SDA - -
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P P P I I I I I I I
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GND 3.27V 4.96V 0.00V 4.96V L H H L L
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#Notice how the VPU is in 5V becausethe EPROM needs 5V signals
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# Get mode options
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HiZ>m
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1. HiZ
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2. 1-WIRE
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3. UART
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4. I2C
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5. SPI
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6. 2WIRE
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7. 3WIRE
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8. KEYB
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9. LCD
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10. PIC
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11. DIO
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x. exit(without change)
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# Select I2C
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(1)>4
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I2C mode:
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1. Software
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2. Hardware
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# Select Software mode
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(1)>1
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Set speed:
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1. ~5kHz
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2. ~50kHz
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3. ~100kHz
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4. ~240kHz
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# Select communication spped
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(1)> 2
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Clutch disengaged!!!
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To finish setup, start up the power supplies with command 'W'
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Ready
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# Start communication
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I2C>W
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POWER SUPPLIES ON
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Clutch engaged!!!
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# Get macros
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I2C>(0)
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0.Macro menu
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1.7bit address search
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2.I2C sniffer
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#Get addresses of slaves connected
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I2C>(1)
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Searching I2C address space. Found devices at:
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0xA0(0x50 W) 0xA1(0x50 R)
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# Note that each slave will have a write address and a read address
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# 0xA0 ad 0xA1 in the previous case
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# Write "BBB" in address 0x69
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I2C>[0xA0 0x00 0x69 0x42 0x42 0x42]
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I2C START BIT
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WRITE: 0xA0 ACK
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WRITE: 0x00 ACK
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WRITE: 0x69 ACK
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WRITE: 0x42 ACK
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WRITE: 0x42 ACK
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WRITE: 0x42 ACK
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I2C STOP BIT
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# Prepare to read from address 0x69
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I2C>[0xA0 0x00 0x69]
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I2C START BIT
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WRITE: 0xA0 ACK
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WRITE: 0x00 ACK
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WRITE: 0x69 ACK
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I2C STOP BIT
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# Read 20B from address 0x69 configured before
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I2C>[0xA1 r:20]
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I2C START BIT
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WRITE: 0xA1 ACK
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READ: 0x42 ACK 0x42 ACK 0x42 ACK 0x20 ACK 0x48 ACK 0x69 ACK 0x20 ACK 0x44 ACK 0x72 ACK 0x65 ACK 0x67 ACK 0x21 ACK 0x20 ACK 0x41 ACK 0x41 ACK 0x41 ACK 0x00 ACK 0xFF ACK 0xFF ACK 0xFF
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NACK
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```
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### Sniffer
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In this scenario we are going to sniff the I2C communication between the arduino and the previous EPROM, you just need to communicate both devices and then connect the bus pirate to the SCL, SDA and GND pins:
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.png>)
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```bash
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I2C>m
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1. HiZ
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2. 1-WIRE
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3. UART
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4. I2C
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5. SPI
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6. 2WIRE
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7. 3WIRE
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8. KEYB
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9. LCD
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10. PIC
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11. DIO
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x. exit(without change)
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(1)>4
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I2C mode:
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1. Software
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2. Hardware
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(1)>1
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Set speed:
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1. ~5kHz
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2. ~50kHz
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3. ~100kHz
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4. ~240kHz
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(1)>1
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Clutch disengaged!!!
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To finish setup, start up the power supplies with command 'W'
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Ready
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# EVEN IF YOU ARE GOING TO SNIFF YOU NEED TO POWER ON!
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I2C>W
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POWER SUPPLIES ON
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Clutch engaged!!!
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# Start sniffing, you can see we sniffed a write command
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I2C>(2)
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Sniffer
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Any key to exit
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[0xA0+0x00+0x69+0x41+0x41+0x41+0x20+0x48+0x69+0x20+0x44+0x72+0x65+0x67+0x21+0x20+0x41+0x41+0x41+0x00+]
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```
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{% hint style="success" %}
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Learn & practice AWS Hacking:<img src="/.gitbook/assets/arte.png" alt="" data-size="line">[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)<img src="/.gitbook/assets/arte.png" alt="" data-size="line">\
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Learn & practice GCP Hacking: <img src="/.gitbook/assets/grte.png" alt="" data-size="line">[**HackTricks Training GCP Red Team Expert (GRTE)**<img src="/.gitbook/assets/grte.png" alt="" data-size="line">](https://training.hacktricks.xyz/courses/grte)
|
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|
|
<details>
|
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|
|
<summary>Support HackTricks</summary>
|
|
|
|
* Check the [**subscription plans**](https://github.com/sponsors/carlospolop)!
|
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* **Join the** 💬 [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** us on **Twitter** 🐦 [**@hacktricks\_live**](https://twitter.com/hacktricks\_live)**.**
|
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* **Share hacking tricks by submitting PRs to the** [**HackTricks**](https://github.com/carlospolop/hacktricks) and [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repos.
|
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</details>
|
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{% endhint %}
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