The MySQL Database Server 8.0 must generate audit records when privileges/permissions are deleted.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-235119	MYS8-00-003200	SV-235119r623479_rule		Medium

Description
Changes in the permissions, privileges, and roles granted to users and roles must be tracked. Without an audit trail, unauthorized elevation or restriction of individual and group privileges could go undetected. Elevated privileges give users access to information and functionality that they should not have; restricted privileges wrongly deny access to authorized users. In an SQL environment, deleting permissions is typically done via the REVOKE or DENY command.

Description

Changes in the permissions, privileges, and roles granted to users and roles must be tracked. Without an audit trail, unauthorized elevation or restriction of individual and group privileges could go undetected. Elevated privileges give users access to information and functionality that they should not have; restricted privileges wrongly deny access to authorized users. In an SQL environment, deleting permissions is typically done via the REVOKE or DENY command.

STIG	Date
Oracle MySQL 8.0 Security Technical Implementation Guide	2021-12-10

Details

Check Text ( C-38338r623477_chk )
Review the system documentation to determine if MySQL Server is required to audit when privileges/permissions are deleted. Check if MySQL audit is configured and enabled. The my.cnf file will set the variable audit_file. To further check, execute the following query: SELECT PLUGIN_NAME, PLUGIN_STATUS FROM INFORMATION_SCHEMA.PLUGINS WHERE PLUGIN_NAME LIKE 'audit%'; The status of the audit_log plugin must be "active". If it is not "active", this is a finding. Review audit filters and associated users by running the following queries: SELECT `audit_log_filter`.`NAME`, `audit_log_filter`.`FILTER` FROM `mysql`.`audit_log_filter`; SELECT `audit_log_user`.`USER`, `audit_log_user`.`HOST`, `audit_log_user`.`FILTERNAME` FROM `mysql`.`audit_log_user`; All currently defined audits for the MySQL server instance will be listed. If no audits are returned, this is a finding. To check if the audit filters in place are generating records when privileges/permissions are deleted, run the following, which will test auditing without destroying data: delete from mysql.procs_priv where 1=2; Review the audit log by running the Linux command: sudo cat /audit.log\|egrep procs_priv For example if the values returned by - "select @@datadir, @@audit_log_file; " are /usr/local/mysql/data/, audit.log sudo cat /usr/local/mysql/data/audit.log \|egrep procs_priv The audit data will look similar to the example below: { "timestamp": "2020-08-19 21:24:26", "id": 2, "class": "general", "event": "status", "connection_id": 9, "account": { "user": "root", "host": "localhost" }, "login": { "user": "root", "os": "", "ip": "::1", "proxy": "" }, "general_data": { "command": "Query", "sql_command": "delete", "query": "delete from procs_priv", "status": 0 } } If the audit event is not present, this is a finding.

Check Text ( C-38338r623477_chk )

Review the system documentation to determine if MySQL Server is required to audit when privileges/permissions are deleted.

Check if MySQL audit is configured and enabled. The my.cnf file will set the variable audit_file.

To further check, execute the following query:

SELECT PLUGIN_NAME, PLUGIN_STATUS
FROM INFORMATION_SCHEMA.PLUGINS
WHERE PLUGIN_NAME LIKE 'audit%';

The status of the audit_log plugin must be "active". If it is not "active", this is a finding.

Review audit filters and associated users by running the following queries:
SELECT `audit_log_filter`.`NAME`,
`audit_log_filter`.`FILTER`
FROM `mysql`.`audit_log_filter`;

SELECT `audit_log_user`.`USER`,
`audit_log_user`.`HOST`,
`audit_log_user`.`FILTERNAME`
FROM `mysql`.`audit_log_user`;

All currently defined audits for the MySQL server instance will be listed. If no audits are returned, this is a finding.

To check if the audit filters in place are generating records when privileges/permissions are deleted, run the following, which will test auditing without destroying data:
delete from mysql.procs_priv where 1=2;

Review the audit log by running the Linux command:
sudo cat /audit.log|egrep procs_priv
For example if the values returned by - "select @@datadir, @@audit_log_file; " are /usr/local/mysql/data/, audit.log
sudo cat /usr/local/mysql/data/audit.log |egrep procs_priv

The audit data will look similar to the example below:
{ "timestamp": "2020-08-19 21:24:26", "id": 2, "class": "general", "event": "status", "connection_id": 9, "account": { "user": "root", "host": "localhost" }, "login": { "user": "root", "os": "", "ip": "::1", "proxy": "" }, "general_data": { "command": "Query", "sql_command": "delete", "query": "delete from procs_priv", "status": 0 } }

If the audit event is not present, this is a finding.

Fix Text (F-38301r623478_fix)
If currently required, configure the MySQL Database Server to produce audit records when privileges/permissions are deleted. See the supplemental file "MySQL80Audit.sql".