postgresql-common could be made to create arbitrary directories.

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Ubuntu Security Notice USN-4194-2
December 03, 2019

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

- Ubuntu 14.04 ESM

Summary:

postgresql-common could be made to create arbitrary directories.

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

Details:

USN-4194-1 fixed a vulnerability in postgresql-common. This update provides
the corresponding update for Ubuntu 14.04 ESM.

Original advisory 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 14.04 ESM:
  postgresql-common               154ubuntu1.1+esm1

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

References:
  https://usn.ubuntu.com/4194-2
  https://usn.ubuntu.com/4194-1
  CVE-2019-3466