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V-253771

CAT II (Medium)

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

Rule ID

SV-253771r961836_rule

STIG

MariaDB Enterprise 10.x Security Technical Implementation Guide

Version

V2R5

CCIs

CCI-000172

Discussion

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.

Check Content

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

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"
                             ]
                         }
                     ]
                  }
              ]
          }'
       )
    );