Updated postgresql-common packages has been released for Ubuntu Linux 19.10, 19.04, 18.04 LTS, and 16.04 LTS to address a security issue with the pg_ctlcluster script

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Ubuntu Security Notice USN-4194-1
November 14, 2019

postgresql-common vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 19.10
- Ubuntu 19.04
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

postgresql-common could be made to create arbitrary directories.

Software Description:
- postgresql-common: PostgreSQL database-cluster manager

Details:

Rich Mirch discovered that the postgresql-common pg_ctlcluster script
incorrectly handled directory creation. A local attacker could possibly use
this issue to escalate privileges.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 19.10:
postgresql-common 204ubuntu0.1

Ubuntu 19.04:
postgresql-common 199ubuntu0.1

Ubuntu 18.04 LTS:
postgresql-common 190ubuntu0.1

Ubuntu 16.04 LTS:
postgresql-common 173ubuntu0.3

In general, a standard system update will make all the necessary changes.

References:
https://usn.ubuntu.com/4194-1
CVE-2019-3466

Package Information:
https://launchpad.net/ubuntu/+source/postgresql-common/204ubuntu0.1
https://launchpad.net/ubuntu/+source/postgresql-common/199ubuntu0.1
https://launchpad.net/ubuntu/+source/postgresql-common/190ubuntu0.1
https://launchpad.net/ubuntu/+source/postgresql-common/173ubuntu0.3