Privilege escalation flaws were found in the Red Hat initialization scripts of PostgreSQL. An attacker with access to the postgres user account could use these flaws to obtain root access on the server machine.
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-15097
https://access.redhat.com/errata/RHSA-2017:3405
https://access.redhat.com/errata/RHSA-2017:3404
https://access.redhat.com/errata/RHSA-2017:3403