The PostgreSQL Global Development Group has released an update to all supported versions of our database system, including 11.3, 10.8, 9.6.13, 9.5.17, and 9.4.22. This release fixes two security issues in the PostgreSQL server, a security issue found in two of the PostgreSQL Windows installers, and over 60 bugs reported over the last three months.
Users who installed PostgreSQL using the Windows installers from EnterpriseDB and BigSQL respectively should upgrade as soon as possible. Similarly, users who are running any version of PostgreSQL 9.5, 9.6, 10, and 11 should also plan to upgrade as soon as possible.
All other users should plan to apply this update at the next scheduled downtime.
Four security vulnerabilities have been closed by this release:
Due to both the EnterpriseDB and BigSQL Windows installers not locking down the permissions of the PostgreSQL binary installation directory and the data directory, an unprivileged Windows user account and an unprivileged PostgreSQL account could cause the PostgreSQL service account to execute arbitrary code.
This vulnerability is present in all supported versions of PostgreSQL for these installers, and possibly exists in older versions. Both sets of installers have fixed the permissions for these directories for both new and existing installations. If you have installed PostgreSQL on Windows using other methods, we advise that you check that your PostgreSQL binary directories are writable only to trusted users and that your data directories are only accessible to trusted users.
The PostgreSQL project thanks Conner Jones for reporting this problem.
Prior to this release, a user running PostgreSQL 11 can read arbitrary bytes of server memory by executing a purpose-crafted INSERT statement to a partitioned table.
PostgreSQL maintains statistics for tables by sampling data available in columns; this data is consulted during the query planning process. Prior to this release, a user able to execute SQL queries with permissions to read a given column could craft a leaky operator that could read whatever data had been sampled from that column. If this happened to include values from rows that the user is forbidden to see by a row security policy, the user could effectively bypass the policy. This is fixed by only allowing a non-leakproof operator to use this data if there are no relevant row security policies for the table.
This issue is present in PostgreSQL 9.5, 9.6, 10, and 11. The PostgreSQL project thanks Dean Rasheed for reporting this problem.
This update also fixes over 60 bugs that were reported in the last several months. Some of these issues affect only version 11, but many affect all supported versions.
Some of these fixes include:
ALTER TABLEon a partitioned table
INSERT .. VALUESstatements where there are multiple VALUES rows
CREATE TABLE IF NOT EXISTS .. AS EXECUTE ..statement
lc_timesettings that imply an encoding different from the database's encoding
current_logfilesfile with the same permissions as other files in the server's
pg_verify_checksumsverify that the data directory it's pointed at is of the right PostgreSQL version
contrib/postgres_fdw, including one for remote partitions where an UPDATE could lead to incorrect results or a crash
This update also contains tzdata release 2019a for DST law changes in Palestine and Metlakatla, plus historical corrections for Israel. Etc/UCT is now a backward-compatibility link to Etc/UTC, instead of being a separate zone that generates the abbreviation UCT, which nowadays is typically a typo. PostgreSQL will still accept UCT as an input zone abbreviation, but it won't output it.
All PostgreSQL update releases are cumulative. As with other minor releases, users are not required to dump and reload their database or use
pg_upgrade in order to apply this update release; you may simply shutdown PostgreSQL and update its binaries.
Users who have skipped one or more update releases may need to run additional, post-update steps; please see the release notes for earlier versions for details.
PostgreSQL 9.4 will stop receiving fixes on February 13, 2020. Please see our versioning policy for more information.