Title

PostgreSQL must maintain the authenticity of communications sessions by guarding against man-in-the-middle attacks that guess at Session ID values. (Cat II impact)

Discussion

One class of man-in-the-middle, or session hijacking, attack involves the adversary guessing at valid session identifiers based on patterns in identifiers already known. The preferred technique for thwarting guesses at Session IDs is the generation of unique session identifiers using a FIPS 140-2 or 140-3 approved random number generator. However, it is recognized that available PostgreSQL products do not all implement the preferred technique yet may have other protections against session hijacking. Therefore, other techniques are acceptable, provided they are demonstrated to be effective.

Check Content

To check if PostgreSQL is configured to use ssl, as the database administrator (shown here as "postgres"), run the following SQL: $ sudo su - postgres $ psql -c "SHOW ssl" If this is not set to on, this is a finding.

Fix Text

Note: The following instructions use the PGDATA and PGVER environment variables. See supplementary content APPENDIX-F for instructions on configuring PGDATA and APPENDIX-H for PGVER. To configure PostgreSQL to use SSL, as a database owner (shown here as "postgres"), edit postgresql.conf: $ sudo su - postgres $ vi ${PGDATA?}/postgresql.conf Add the following parameter: ssl = on Now, as the system administrator, reload the server with the new configuration: # SYSTEMD SERVER ONLY $ sudo systemctl reload postgresql-${PGVER?} # INITD SERVER ONLY $ sudo service postgresql-${PGVER?} reload For more information on configuring PostgreSQL to use SSL, see supplementary content APPENDIX-G. For further SSL configurations, see the official documentation: https://www.postgresql.org/docs/current/static/ssl-tcp.html

Additional Identifiers

Rule ID: SV-214145r879639_rule

Vulnerability ID: V-214145

Group Title: SRG-APP-000224-DB-000384

Expert Comments

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