PostgreSQL must generate audit records when privileges/permissions are deleted.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-261950	SRG-APP-000499-DB-000330	CD16-00-010600	SV-261950r1000855_rule	2024-06-17	1

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 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 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.

ℹ️ Check
As the database administrator, verify pgaudit is enabled by running the following SQL: $ sudo su - postgres $ psql -c "SHOW shared_preload_libraries" If the output does not contain pgaudit, this is a finding. Verify that role, read, write, and ddl auditing are enabled: $ psql -c "SHOW pgaudit.log" If the output does not contain role, read, write, and ddl, this is a finding.

✔️ Fix
Note: The following instructions use the PGDATA and PGVER environment variables. Refer to APPENDIX-F for instructions on configuring PGDATA and APPENDIX-H for PGVER. PostgreSQL can be configured to audit these requests using pgaudit. Refer to supplementary content APPENDIX-B for documentation on installing pgaudit. With pgaudit installed, the following configurations can be made: $ sudo su - postgres $ vi ${PGDATA?}/postgresql.conf Add the following parameters (or edit existing parameters): pgaudit.log = 'role' As the system administrator, reload the server with the new configuration: $ sudo systemctl reload postgresql-${PGVER?}

✔️ Fix

Note: The following instructions use the PGDATA and PGVER environment variables. Refer to APPENDIX-F for instructions on configuring PGDATA and APPENDIX-H for PGVER. PostgreSQL can be configured to audit these requests using pgaudit. Refer to supplementary content APPENDIX-B for documentation on installing pgaudit. With pgaudit installed, the following configurations can be made: $ sudo su - postgres $ vi ${PGDATA?}/postgresql.conf Add the following parameters (or edit existing parameters): pgaudit.log = 'role' As the system administrator, reload the server with the new configuration: $ sudo systemctl reload postgresql-${PGVER?}