Attacking AUTOSAR using Software and Hardware Attacks Pascal al - PowerPoint PPT Presentation

AUTOSAR’s PDU Router 1. CAN driver receives 8-byte CAN frame 2. Frame passes the CAN interface 3. Payload is reassembled by ISO-TP 4. Payload is copied to COM or DCM 77

AUTOSAR’s PDU Router 1. CAN driver receives 8-byte CAN frame 2. Frame passes the CAN interface 3. Payload is reassembled by ISO-TP 4. Payload is copied to COM or DCM 5. COM or DCM handles the payload 78

Where do we attack?! 79

AUTOSAR’s PDU Router 1. CAN driver receives 8-byte CAN frame 2. Frame passes the CAN interface 3. Payload is reassembled by ISO-TP 4. Payload is copied to COM or DCM 5. COM or DCM handles the payload 80

Attacking AUTOSAR’s PDU router 81

Attacking AUTOSAR’s PDU router • Step 1: Send an ISO-TP CAN message (< 4096 bytes) 82

Attacking AUTOSAR’s PDU router • Step 1: Send an ISO-TP CAN message (< 4096 bytes) Copy ‘Our task’ Our to ‘free memory’ task 83

Attacking AUTOSAR’s PDU router • Step 1: Send an ISO-TP CAN message (< 4096 bytes) Copy ‘Our task’ Modify pointer of IDLE Our to ‘free memory’ task to ‘free memory’ task 84

Attacking AUTOSAR’s PDU router • Step 1: Send an ISO-TP CAN message (< 4096 bytes) Copy ‘Our task’ Modify pointer of IDLE Continue with Our to ‘free memory’ task to ‘free memory’ current task task 85

Attacking AUTOSAR’s PDU router • Step 1: Send an ISO-TP CAN message (< 4096 bytes) Copy ‘Our task’ Modify pointer of IDLE Continue with Our Pointers pointing to the start of the payload to ‘free memory’ task to ‘free memory’ current task task 86

Attacking AUTOSAR’s PDU router • Step 1: Send an ISO-TP CAN message (< 4096 bytes) Copy ‘Our task’ Modify pointer of IDLE Continue with Our Pointers pointing to the start of the payload to ‘free memory’ task to ‘free memory’ current task task • Step 2: We inject the glitch when the pointers are being copied 87

Attacking AUTOSAR’s PDU router • Step 1: Send an ISO-TP CAN message (< 4096 bytes) Copy ‘Our task’ Modify pointer of IDLE Continue with Our Pointers pointing to the start of the payload to ‘free memory’ task to ‘free memory’ current task task • Step 2: We inject the glitch when the pointers are being copied • Step 3: Successful glitches load a pointer into the PC register 88

Attacking AUTOSAR’s PDU router • Step 1: Send an ISO-TP CAN message (< 4096 bytes) Copy ‘Our task’ Modify pointer of IDLE Continue with Our Pointers pointing to the start of the payload to ‘free memory’ task to ‘free memory’ current task task • Step 2: We inject the glitch when the pointers are being copied • Step 3: Successful glitches load a pointer into the PC register • Step 4: MCU will execute the ISO-TP message (blue blocks) 89

Attacking AUTOSAR’s PDU router • Step 1: Send an ISO-TP CAN message (< 4096 bytes) Copy ‘Our task’ Modify pointer of IDLE Continue with Our Pointers pointing to the start of the payload to ‘free memory’ task to ‘free memory’ current task task • Step 2: We inject the glitch when the pointers are being copied • Step 3: Successful glitches load a pointer into the PC register • Step 4: MCU will execute the ISO-TP message (blue blocks) • Step 5: Wait for IDLE task to be scheduled and execute our task 90

Why does this work? 91

Attacking AUTOSAR’s PDU Router 92

Attacking AUTOSAR’s PDU Router Disassembled memcpy() 93

Attacking AUTOSAR’s PDU Router Disassembled memcpy() 94

Attacking AUTOSAR’s PDU Router Disassembled memcpy() We take control of the Program Counter (PC) during the copy! 95

We have our own task. Now what?! 96

Post Exploitation 97

Post Exploitation • Extract information (secrets) 98

Post Exploitation • Extract information (secrets) • Analyze firmware dynamically 99

Post Exploitation • Extract information (secrets) • Analyze firmware dynamically • Perform additional attacks (e.g. side channel attack) 100