A postgresql-common security update has been released for both Debian GNU/Linux 9 and 10 to address a local privilege escalation

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Debian Security Advisory DSA-4568-1 security@debian.org
https://www.debian.org/security/ Moritz Muehlenhoff
November 14, 2019 https://www.debian.org/security/faq
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Package : postgresql-common
CVE ID : CVE-2019-3466

Rich Mirch discovered that the pg_ctlcluster script didn't drop
privileges when creating socket/statistics temporary directories, which
could result in local privilege escalation.

For the oldstable distribution (stretch), this problem has been fixed
in version 181+deb9u3.

For the stable distribution (buster), this problem has been fixed in
version 200+deb10u3.

We recommend that you upgrade your postgresql-common packages.

For the detailed security status of postgresql-common please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/postgresql-common

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/