STIGQter: STIG Summary: PostgreSQL 9.x Security Technical Implementation Guide Version: 2 Release: 1 Benchmark Date: 23 Oct 2020:

PostgreSQL must produce audit records of its enforcement of access restrictions associated with changes to the configuration of PostgreSQL or database(s).

DISA Rule

SV-214082r508027_rule

Vulnerability Number

V-214082

Group Title

SRG-APP-000381-DB-000361

Rule Version

PGS9-00-004100

Severity

CAT II

CCI(s)

• CCI-001814 - The Information system supports auditing of the enforcement actions.

Weight

10

Fix Recommendation

Enable logging.

All denials are logged by default if logging is enabled. To ensure that logging is enabled, review supplementary content APPENDIX-C for instructions on enabling logging.

Check Contents

Note: The following instructions use the PGDATA environment variable. See supplementary content APPENDIX-F for instructions on configuring PGDATA.

To verify that system denies are logged when unprivileged users attempt to change database configuration, as the database administrator (shown here as "postgres"), run the following commands:

$ sudo su - postgres
$ psql

Next, create a role with no privileges, change the current role to that user and attempt to change a configuration by running the following SQL:

CREATE ROLE bob;
SET ROLE bob;
SET pgaudit.role='test';

Now check pg_log (use the latest log):

$ cat ${PGDATA?}/pg_log/postgresql-Thu.log
< 2016-01-28 17:57:34.092 UTC bob postgres: >ERROR: permission denied to set parameter "pgaudit.role"
< 2016-01-28 17:57:34.092 UTC bob postgres: >STATEMENT: SET pgaudit.role='test';

If the denial is not logged, this is a finding.

By default PostgreSQL configuration files are owned by the postgres user and cannot be edited by non-privileged users:

$ ls -la ${PGDATA?} | grep postgresql.conf
-rw-------. 1 postgres postgres 21758 Jan 22 10:27 postgresql.conf

If postgresql.conf is not owned by the database owner and does not have read and write permissions for the owner, this is a finding.

Vulnerability Number

V-214082

Documentable

False

Rule Version

PGS9-00-004100

Severity Override Guidance

Note: The following instructions use the PGDATA environment variable. See supplementary content APPENDIX-F for instructions on configuring PGDATA.

To verify that system denies are logged when unprivileged users attempt to change database configuration, as the database administrator (shown here as "postgres"), run the following commands:

$ sudo su - postgres
$ psql

Next, create a role with no privileges, change the current role to that user and attempt to change a configuration by running the following SQL:

CREATE ROLE bob;
SET ROLE bob;
SET pgaudit.role='test';

Now check pg_log (use the latest log):

$ cat ${PGDATA?}/pg_log/postgresql-Thu.log
< 2016-01-28 17:57:34.092 UTC bob postgres: >ERROR: permission denied to set parameter "pgaudit.role"
< 2016-01-28 17:57:34.092 UTC bob postgres: >STATEMENT: SET pgaudit.role='test';

If the denial is not logged, this is a finding.

By default PostgreSQL configuration files are owned by the postgres user and cannot be edited by non-privileged users:

$ ls -la ${PGDATA?} | grep postgresql.conf
-rw-------. 1 postgres postgres 21758 Jan 22 10:27 postgresql.conf

If postgresql.conf is not owned by the database owner and does not have read and write permissions for the owner, this is a finding.

Check Content Reference

M

Target Key

3994

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