PostgreSQL 2018-03-01 Security Update Release

2018-03-01 Security Update Release
==================================
The PostgreSQL Global Development Group has released an update to all supported
versions of the PostgreSQL database system, including 10.3, 9.6.8, 9.5.12,
9.4.17, and 9.3.22.

The purpose of this release is to address CVE-2018-1058, which describes how a
user can create like-named objects in different schemas that can change the
behavior of other users' queries and cause unexpected or malicious behavior,
also known as a "trojan-horse" attack. Most of this release centers around added
documentation that describes the issue and how to take steps to mitigate the
impact on PostgreSQL databases.

We strongly encourage all of our users to please visit
https://wiki.postgresql.org/wiki/A_Guide_to_CVE-2018-1058:_Protect_Your_Search_Path
for a detailed explanation of CVE-2018-1058 and how to protect your PostgreSQL
installations.

After evaluating the documentation for CVE-2018-1058, a database administrator
may need to take follow up steps on their PostgreSQL installations to ensure
they are protected from exploitation.

Security Issues
---------------

One security vulnerability is addressed in this release:

* CVE-2018-1058: Uncontrolled search path element in pg_dump and other client
applications

Please visit https://wiki.postgresql.org/wiki/A_Guide_to_CVE-2018-1058:_Protect_Your_Search_Path
for a full explanation of the CVE-2018-1058.

Bug Fixes and Improvements
--------------------------

This update fixes several bugs reported since the last cumulative update. Some
of these issues affect only version 10, but many affect all supported versions.
These fixes include:

* Prevent logical replication from trying to replicate changes for unpublishable
  relations, such as materialized views and the "information_schema" tables
* Fix for a common table expression (WITH clause) returning correct results when
  being referenced in a subplan where there are concurrent-update rechecks
* Fix for an unexpected query planner error in certain cases where there are
  overlapping merge join clauses in an OUTER JOIN.
* Fix for potential data corruption with materialized views after running
  pg_upgrade. If receiving errors such as "could not access status of
  transaction" or "found xmin from before relfrozenxid" on materialized views,
  please use "REFRESH MATERIALIZED VIEW" without "CONCURRENTLY" to fix.
* Several fix for pg_dump, including a fix to help with the future work of
  cross-table statistics
* Fix for reporting a PL/Python stack trace relative to inner PL/Python
  functions
* Allow contrib/auto_explain to range up to INT_MAX, which is about 24 days
* Mark assorted configuration variables as PGDLLIMPORT, to ease porting
  extension modules to Windows

Acknowledgements
----------------

The PostgreSQL Global Development Group would like to thank
Arseniy Sharoglazov for reporting CVE-2018-1058 to the security team.

Links
------
* A Guide to CVE-2018-1058: https://wiki.postgresql.org/wiki/A_Guide_to_CVE-2018-1058:_Protect_Your_Search_Path
* Download: https://www.postgresql.org/download
* Release Notes: https://www.postgresql.org/docs/current/static/release.html
* Security Page: https://www.postgresql.org/support/security/
* Versioning Policy: https://www.postgresql.org/support/versioning/