Recommended update for postgresql95 (moderate)

This update for postgresql95 fixes the following issues:

• Update to PostgreSQL 9.5.13:

  • <a href=“https://www.postgresql.org/docs/9.5/static/release-9-5-13.html”>https://www.postgresql.org/docs/9.5/static/release-9-5-13.html</a> A
    dump/restore is not required for those running 9.5.X. However, if the
    function marking mistakes mentioned belowpg_logfile_rotate affect you,
    you will want to take steps to correct your database catalogs.

    The functions query_to_xml, cursor_to_xml, cursor_to_xmlschema,
    query_to_xmlschema, and query_to_xml_and_xmlschema should be marked
    volatile because they execute user-supplied queries that might contain
    volatile operations. They were not, leading to a risk of incorrect query
    optimization. This has been repaired for new installations by correcting
    the initial catalog data, but existing installations will continue to
    contain the incorrect markings. Practical use of these functions seems to
    pose little hazard, but in case of trouble, it can be fixed by manually
    updating these functions’ pg_proc entries, for example: ALTER FUNCTION
    pg_catalog.query_to_xml(text, boolean, boolean, text) VOLATILE. (Note that
    that will need to be done in each database of the installation.) Another
    option is to pg_upgrade the database to a version containing the corrected
    initial data.

Security issue fixed:

• CVE-2018-1115: Remove public execute privilege from contrib/adminpack’s
  pg_logfile_rotate() function pg_logfile_rotate() is a deprecated wrapper
  for the core function pg_rotate_logfile(). When that function was
  changed to rely on SQL privileges for access control rather than a
  hard-coded superuser check, pg_logfile_rotate() should have been updated
  as well, but the need for this was missed. Hence, if adminpack is
  installed, any user could request a logfile rotation, creating a minor
  security issue. After installing this update, administrators should
  update adminpack by performing ALTER EXTENSION adminpack UPDATE in each
  database in which adminpack is installed. (bsc#1091610)