USN-3390-1: PostgreSQL vulnerabilities

Ubuntu Security Notice USN-3390-1

15th August, 2017

postgresql-9.3, postgresql-9.5, postgresql-9.6 vulnerabilities

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-9.3
– Object-relational SQL database
postgresql-9.5
– Object-relational SQL database
postgresql-9.6
– 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 version:

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

To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.

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.