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Ubuntu Security Notice USN-3066-1
August 18, 2016

postgresql-9.1, postgresql-9.3, postgresql-9.5 vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS
- Ubuntu 12.04 LTS

Summary:

Several security issues were fixed in PostgreSQL.

Software Description:
- postgresql-9.5: object-relational SQL database
- postgresql-9.3: Object-relational SQL database
- postgresql-9.1: Object-relational SQL database

Details:

Heikki Linnakangas discovered that PostgreSQL incorrectly handled certain
nested CASE/WHEN expressions. A remote attacker could possibly use this
issue to cause PostgreSQL to crash, resulting in a denial of service.
(CVE-2016-5423)

Nathan Bossart discovered that PostgreSQL incorrectly handled special
characters in database and role names. A remote attacker could possibly use
this issue to escalate privileges. (CVE-2016-5424)

Update instructions:

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

Ubuntu 16.04 LTS:
  postgresql-9.5                  9.5.4-0ubuntu0.16.04

Ubuntu 14.04 LTS:
  postgresql-9.3                  9.3.14-0ubuntu0.14.04

Ubuntu 12.04 LTS:
  postgresql-9.1                  9.1.23-0ubuntu0.12.04

This update uses a new upstream release, which includes additional bug
fixes. After a standard system update you need to restart PostgreSQL to
make all the necessary changes.

References:
  http://www.ubuntu.com/usn/usn-3066-1
  CVE-2016-5423, CVE-2016-5424

Package Information:
  https://launchpad.net/ubuntu/+source/postgresql-9.5/9.5.4-0ubuntu0.16.04
  https://launchpad.net/ubuntu/+source/postgresql-9.3/9.3.14-0ubuntu0.14.04
  https://launchpad.net/ubuntu/+source/postgresql-9.1/9.1.23-0ubuntu0.12.04