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Ubuntu Security Notice USN-3390-1
August 15, 2017

postgresql-9.3, postgresql-9.5, postgresql-9.6 vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 17.04
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in PostgreSQL.

Software Description:
- postgresql-9.6: object-relational SQL database
- postgresql-9.5: Object-relational SQL database
- postgresql-9.3: Object-relational SQL database

Details:

Ben de Graaff, Jelte Fennema, and Jeroen van der Ham discovered that
PostgreSQL allowed the use of empty passwords in some authentication
methods, contrary to expected behaviour. A remote attacker could use an
empty password to authenticate to servers that were believed to have
password login disabled. (CVE-2017-7546)

Jeff Janes discovered that PostgreSQL incorrectly handled the
pg_user_mappings catalog view. A remote attacker without server privileges
could possibly use this issue to obtain certain passwords. (CVE-2017-7547)

Chapman Flack discovered that PostgreSQL incorrectly handled lo_put()
permissions. A remote attacker could possibly use this issue to change the
data in a large object. (CVE-2017-7548)

Update instructions:

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

Ubuntu 17.04:
  postgresql-9.6                  9.6.4-0ubuntu0.17.04.1

Ubuntu 16.04 LTS:
  postgresql-9.5                  9.5.8-0ubuntu0.16.04.1

Ubuntu 14.04 LTS:
  postgresql-9.3                  9.3.18-0ubuntu0.14.04.1

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:
  https://www.ubuntu.com/usn/usn-3390-1
  CVE-2017-7546, CVE-2017-7547, CVE-2017-7548

Package Information:
  https://launchpad.net/ubuntu/+source/postgresql-9.6/9.6.4-0ubuntu0.17.04.1
  https://launchpad.net/ubuntu/+source/postgresql-9.5/9.5.8-0ubuntu0.16.04.1
  https://launchpad.net/ubuntu/+source/postgresql-9.3/9.3.18-0ubuntu0.14.04.1