Debian: DSA-4492-1 Moderate: Postgresql-9.6 Privilege Escalation

A issue has been discovered in the PostgreSQL database system, which
could result in privilege escalation.

For additional information please refer to the upstream announcement at
https://www.postgresql.org/about/news/postgresql-115-1010-9615-9519-9424-and-12-beta-3-released-1960/

For the oldstable distribution (stretch), these problems have been fixed
in version 9.6.15-0+deb9u1.

We recommend that you upgrade your postgresql-9.6 packages.

For the detailed security status of postgresql-9.6 please refer to
its security tracker page at:

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/