mirror of
https://github.com/carlospolop/hacktricks
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232 lines
6.4 KiB
Markdown
232 lines
6.4 KiB
Markdown
# I2C
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{% hint style="success" %}
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Aprenda e pratique Hacking AWS:<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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Aprenda e pratique Hacking GCP: <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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* Confira os [**planos de assinatura**](https://github.com/sponsors/carlospolop)!
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* **Junte-se ao** 💬 [**grupo do Discord**](https://discord.gg/hRep4RUj7f) ou ao [**grupo do telegram**](https://t.me/peass) ou **siga**-nos no **Twitter** 🐦 [**@hacktricks\_live**](https://twitter.com/hacktricks\_live)**.**
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* **Compartilhe truques de hacking enviando PRs para os repositórios do** [**HackTricks**](https://github.com/carlospolop/hacktricks) e [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud).
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</details>
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{% endhint %}
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## Bus Pirate
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Para testar se um Bus Pirate está funcionando, conecte +5V com VPU e 3.3V com ADC e acesse o bus pirate (Usando Tera Term, por exemplo) e use o comando `~`:
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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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Como você pode ver na linha de comando anterior, foi dito que encontrou 0 erros. Isso é muito útil para saber se está funcionando após a compra ou após a gravação de um firmware.
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Para se conectar com o bus pirate, você pode seguir a documentação:
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.png>)
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Neste caso, vou me conectar a um EPROM: ATMEL901 24C256 PU27:
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.png>)
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Para conversar com o bus pirate, usei o Tera Term conectado à porta COM do bus pirate com uma Configuração --> Porta Serial --> Velocidade de 115200.\
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Na comunicação a seguir, você pode encontrar como preparar o bus pirate para falar I2C e como escrever e ler da memória (Comentários aparecem usando "#", não espere que essa parte esteja na comunicação):
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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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Neste cenário, vamos monitorar a comunicação I2C entre o arduino e a EPROM anterior, você só precisa comunicar os dois dispositivos e, em seguida, conectar o bus pirate aos pinos SCL, SDA e GND:
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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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Aprenda e pratique Hacking AWS:<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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Aprenda e pratique Hacking GCP: <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>Suporte ao HackTricks</summary>
|
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|
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* Confira os [**planos de assinatura**](https://github.com/sponsors/carlospolop)!
|
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* **Junte-se ao** 💬 [**grupo do Discord**](https://discord.gg/hRep4RUj7f) ou ao [**grupo do telegram**](https://t.me/peass) ou **siga**-nos no **Twitter** 🐦 [**@hacktricks\_live**](https://twitter.com/hacktricks\_live)**.**
|
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* **Compartilhe truques de hacking enviando PRs para os repositórios do** [**HackTricks**](https://github.com/carlospolop/hacktricks) e [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud).
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</details>
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{% endhint %}
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