MariaDB must generate audit records when unsuccessful accesses to objects occur.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-253771	MADB-10-011900	SV-253771r841838_rule		Medium

Description
Without tracking all or selected types of access to all or selected objects (tables, views, procedures, functions, etc.), it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. In an SQL environment, types of access include, but are not necessarily limited to: SELECT INSERT UPDATE DELETE EXECUTE To aid in diagnosis, it is necessary to keep track of failed attempts in addition to the successful ones.

Description

Without tracking all or selected types of access to all or selected objects (tables, views, procedures, functions, etc.), it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. In an SQL environment, types of access include, but are not necessarily limited to: SELECT INSERT UPDATE DELETE EXECUTE To aid in diagnosis, it is necessary to keep track of failed attempts in addition to the successful ones.

STIG	Date
MariaDB Enterprise 10.x Security Technical Implementation Guide	2022-08-24

Details

Check Text ( C-57223r841836_chk )
Verify the MariaDB Enterprise Audit plugin is loaded and actively logging: MariaDB> SHOW GLOBAL STATUS LIKE 'Server_audit_active'; Default Audit Filter is applied to all users by default. Named Audit Filters are assigned to specific users. Check what filters are in place by running the following as an administrative user: MariaDB> SELECT * FROM mysql.server_audit_filters; Check what Named Audit Filters are assigned to what users: MariaDB> SELECT sau.host, sau.user, saf.filtername, JSON_DETAILED(saf.rule) FROM mysql.server_audit_filters saf JOIN mysql.server_audit_users sau ON saf.filtername = sau.filtername WHERE saf.filtername != 'default'\G If the MariaDB Enterprise Audit plugin is not active and/or necessary auditing is not in place, this is a finding.

Check Text ( C-57223r841836_chk )

Verify the MariaDB Enterprise Audit plugin is loaded and actively logging:

MariaDB> SHOW GLOBAL STATUS LIKE 'Server_audit_active';

Default Audit Filter is applied to all users by default.

Named Audit Filters are assigned to specific users.

Check what filters are in place by running the following as an administrative user:

MariaDB> SELECT * FROM mysql.server_audit_filters;

Check what Named Audit Filters are assigned to what users:

MariaDB> SELECT sau.host, sau.user, saf.filtername,
JSON_DETAILED(saf.rule)
FROM mysql.server_audit_filters saf
JOIN mysql.server_audit_users sau
ON saf.filtername = sau.filtername
WHERE saf.filtername != 'default'\G

If the MariaDB Enterprise Audit plugin is not active and/or necessary auditing is not in place, this is a finding.

Fix Text (F-57174r841837_fix)
If the MariaDB Enterprise Audit plugin is not active, enable it in one of the two following ways. 1. Config file (requires restart): [mariadb] server_audit_logging = ON 2. SQL (does not require restart): MariaDB> SET GLOBAL server_audit_logging=ON; Once the MariaDB Enterprise Audit plugin is loaded, verify the MariaDB Enterprise Audit plugin is loaded and actively logging: MariaDB> SHOW GLOBAL STATUS LIKE 'Server_audit_active'; If the necessary auditing is not in place for all or specific users, modify the filters. To modify the default filter, delete and recreate: MariaDB> DELETE FROM mysql.server_audit_filters WHERE filtername = 'default'; MariaDB> INSERT INTO mysql.server_audit_filters (filtername, rule) VALUES ('default', JSON_COMPACT( '{ "logging":"ON", "connect_event":"ALL", "query_event":"ALL", "table_event":"ALL" }' )); Specific objects can be added to filters with inclusion or exclusion. ignore_databases: Do not log actions on these databases. ignore_tables: Do not log actions on these tables. databases: Log actions on these databases. tables: Log actions on these tables. Example: MariaDB> INSERT INTO mysql.server_audit_filters (filtername, rule) VALUES ( 'reporting', JSON_COMPACT( '{ "tables": [ "production.", "reporting.", { "table_event": [ "WRITE", "CREATE", "DROP", "RENAME", "ALTER" ], "query_event": [ "DML", "DDL", { "ignore_tables": [ "production.customer_profiles", "production.customer_addresses" ] } ] } ] }' ) );

Fix Text (F-57174r841837_fix)

If the MariaDB Enterprise Audit plugin is not active, enable it in one of the two following ways.

1. Config file (requires restart):

[mariadb]
server_audit_logging = ON

2. SQL (does not require restart):

MariaDB> SET GLOBAL server_audit_logging=ON;

Once the MariaDB Enterprise Audit plugin is loaded, verify the MariaDB Enterprise Audit plugin is loaded and actively logging:

MariaDB> SHOW GLOBAL STATUS LIKE 'Server_audit_active';

If the necessary auditing is not in place for all or specific users, modify the filters.

To modify the default filter, delete and recreate:

MariaDB> DELETE FROM mysql.server_audit_filters WHERE filtername = 'default';

MariaDB> INSERT INTO mysql.server_audit_filters (filtername, rule)
VALUES ('default',
JSON_COMPACT(
'{
"logging":"ON",
"connect_event":"ALL",
"query_event":"ALL",
"table_event":"ALL"
}'
));

Specific objects can be added to filters with inclusion or exclusion.

ignore_databases: Do not log actions on these databases.
ignore_tables: Do not log actions on these tables.
databases: Log actions on these databases.
tables: Log actions on these tables.

Example:

MariaDB> INSERT INTO mysql.server_audit_filters (filtername, rule)
VALUES (
'reporting',
JSON_COMPACT(
'{
"tables": [
"production.*",
"reporting.*",
{
"table_event": [
"WRITE",
"CREATE",
"DROP",
"RENAME",
"ALTER"
],
"query_event": [
"DML",
"DDL",
{
"ignore_tables": [
"production.customer_profiles",
"production.customer_addresses"
]
}
]
}
]
}'
)
);