V-72955

Severity: Medium

Generated

2019-05-20 15:48:11.984914

Status

Failed

PostgreSQL must generate audit records when unsuccessful attempts to access categorized information (e.g., classification levels/security levels) occur.

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. To aid in diagnosis, it is necessary to keep track of failed attempts in addition to the successful ones. 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

First, as the database administrator (shown here as “postgres”), run the following SQL: $ sudo su - postgres $ psql -c “SHOW pgaudit.log” If pgaudit.log does not contain, “ddl, write, role”, this is a finding.

Fix

Configure PostgreSQL to produce audit records when unsuccessful attempts to access categories of information. All denials are logged if logging is enabled. To ensure that logging is enabled, review supplementary content APPENDIX-C for instructions on enabling logging. 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, write, role’ 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 pgaudit.log; output should include "ddl" passed
PostgreSQL query: SHOW pgaudit.log; output should include "role" passed
PostgreSQL query: SHOW pgaudit.log; output should include "write" failed

Code

control "V-72955" do
  title "PostgreSQL must generate audit records when unsuccessful attempts to
  access categorized information (e.g., classification levels/security levels)
  occur."
  desc  "Changes in categorized information must be tracked. Without an audit
  trail, unauthorized access to protected data could go undetected.
  To aid in diagnosis, it is necessary to keep track of failed attempts in
  addition to the successful ones.
  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-000494-DB-000345"
  tag "gid": "V-72955"
  tag "rid": "SV-87607r1_rule"
  tag "stig_id": "PGS9-00-005900"
  tag "cci": "CCI-000172"
  tag "nist": ["AU-12 c", "Rev_4"]
  tag "check": "First, as the database administrator (shown here as
  \"postgres\"), run the following SQL:
  $ sudo su - postgres
  $ psql -c \"SHOW pgaudit.log\"
  If pgaudit.log does not contain, \"ddl, write, role\", this is a finding."
  tag "fix": "Configure PostgreSQL to produce audit records when unsuccessful
  attempts to access categories of information.
  All denials are logged if logging is enabled. To ensure that logging is
  enabled, review supplementary content APPENDIX-C for instructions on enabling
  logging.
  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, write, role'
  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)

  pgaudit_types = %w(ddl role write)

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