PGS9-00-002300 - The audit information produced by PostgreSQL must be protected from unauthorized deletion - log files

Information

If audit data were to become compromised, then competent forensic analysis and discovery of the true source of potentially malicious system activity is impossible to achieve.

To ensure the veracity of audit data, the information system and/or the application must protect audit information from unauthorized deletion. This requirement can be achieved through multiple methods which will depend upon system architecture and design.

Some commonly employed methods include: ensuring log files enjoy the proper file system permissions utilizing file system protections; restricting access; and backing up log data to ensure log data is retained.

Applications providing a user interface to audit data will leverage user permissions and roles identifying the user accessing the data and the corresponding rights the user enjoys in order make access decisions regarding the deletion of audit data.

Audit information includes all information (e.g., audit records, audit settings, and audit reports) needed to successfully audit information system activity.

Deletion of database audit data could mask the theft of, or the unauthorized modification of, sensitive data stored in the database.

NOTE: Nessus has not performed this check. Please review the benchmark to ensure target compliance.

Solution

To ensure that logging is enabled, review supplementary content APPENDIX-C for instructions on enabling logging.

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

#### stderr Logging

With stderr logging enabled, as the database owner (shown here as 'postgres'), set the following parameter in postgresql.conf:

$ vi ${PGDATA?}/postgresql.conf
log_file_mode = 0600

To change the owner and permissions of the log files, run the following:

$ chown postgres:postgres ${PGDATA?}/<log directory name>
$ chmod 0700 ${PGDATA?}/<log directory name>
$ chmod 600 ${PGDATA?}/<log directory name>/*.log

#### syslog Logging

If PostgreSQL is configured to use syslog for logging, the log files must be configured to be owned by root with 0600 permissions.

$ chown root:root <log directory name>/<log_filename>
$ chmod 0700 <log directory name>
$ chmod 0600 <log directory name>/*.log

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_PGS_SQL_9-x_V2R2_STIG.zip

Item Details

Category: AUDIT AND ACCOUNTABILITY

References: 800-53|AU-9, CAT|II, CCI|CCI-000164, Rule-ID|SV-214068r508027_rule, STIG-ID|PGS9-00-002300, STIG-Legacy|SV-87537, STIG-Legacy|V-72885, Vuln-ID|V-214068

Plugin: Unix

Control ID: 5e06a9f48cc7b048b28723ba4d195a2010f04c36e91886a9c260331bc4e5effa