V-72973

Severity: Medium

Generated

2019-05-20 15:48:11.984914

Status

Failed

PostgreSQL must generate audit records when categorized information (e.g., classification levels/security levels) is modified.

NIST 800-53

STIG # Description Result
AU-12 AU-12: Audit Generation failed

Guidance

Changes in categorized information must be tracked. Without an audit trail, unauthorized access to protected data could go undetected. For detailed information on categorizing information, refer to FIPS Publication 199, Standards for Security Categorization of Federal Information and Information Systems, and FIPS Publication 200, Minimum Security Requirements for Federal Information and Information Systems.

Check

If category tracking is not required in the database, this is not applicable. First, 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. Next, 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 environment variable. See supplementary content APPENDIX-F for instructions on configuring P GDATA. To ensure that logging is enabled, review supplementary content APPENDIX-C for instructions on enabling logging. Using pgaudit PostgreSQL can be configured to audit these requests. See 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=‘ddl, role, read, write’ Now, as the system administrator, reload the server with the new configuration: # SYSTEMD SERVER ONLY $ sudo systemctl reload postgresql-9.5 # INITD SERVER ONLY $ sudo service postgresql-9.5 reload

Test Results

  Result
PostgreSQL query: SHOW shared_preload_libraries; output should include "pgaudit" passed
PostgreSQL query: SHOW pgaudit.log; output should include "ddl" passed
PostgreSQL query: SHOW pgaudit.log; output should include "read" failed
PostgreSQL query: SHOW pgaudit.log; output should include "role" passed
PostgreSQL query: SHOW pgaudit.log; output should include "write" failed

Code

  control "V-72973" do
  title "PostgreSQL must generate audit records when categorized information
  (e.g., classification levels/security levels) is modified."
  desc  "Changes in categorized information must be tracked. Without an audit
  trail, unauthorized access to protected data could go undetected.
  For detailed information on categorizing information, refer to FIPS
  Publication 199, Standards for Security Categorization of Federal Information
  and Information Systems, and FIPS Publication 200, Minimum Security
  Requirements for Federal Information and Information Systems."
  impact 0.5
  tag "severity": "medium"
  tag "gtitle": "SRG-APP-000498-DB-000346"
  tag "gid": "V-72973"
  tag "rid": "SV-87625r1_rule"
  tag "stig_id": "PGS9-00-006700"
  tag "cci": "CCI-000172"
  tag "nist": ["AU-12 c", "Rev_4"]
  tag "check": "If category tracking is not required in the database, this is
  not applicable.
  First, 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.
  Next, 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."
  tag "fix": "Note: The following instructions use the PGDATA environment
  variable. See supplementary content APPENDIX-F for instructions on configuring P
  GDATA.
  To ensure that logging is enabled, review supplementary content APPENDIX-C for
  instructions on enabling logging.
  Using pgaudit PostgreSQL can be configured to audit these requests. See
  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='ddl, role, read, write'
  Now, as the system administrator, reload the server with the new configuration:
  # SYSTEMD SERVER ONLY
  $ sudo systemctl reload postgresql-9.5
  # INITD SERVER ONLY
  $ sudo service postgresql-9.5 reload"

  sql = postgres_session(PG_DBA, PG_DBA_PASSWORD, PG_HOST)

  describe sql.query('SHOW shared_preload_libraries;', [PG_DB]) do
    its('output') { should include 'pgaudit' }
  end

  pgaudit_types = %w(ddl read role write)

  pgaudit_types.each do |type|
    describe sql.query('SHOW pgaudit.log;', [PG_DB]) do
      its('output') { should include type }
    end
  end
end