PostgreSQL 13.4, 12.8, 11.13, 10.18, 9.6.23
Security Issues
CVE-2021-3677: Memory disclosure in certain queries
Versions Affected: 11 - 13.
A purpose-crafted query can read arbitrary bytes of server memory. In the default configuration, any authenticated database user can complete this attack at will. The attack does not require the ability to create objects. If server settings include max_worker_processes=0, the known versions of this attack are infeasible. However, undiscovered variants of the attack may be independent of that setting.
Bug Fixes and Improvements
This update also fixes over 75 bugs that were reported in the last several months. Some of these issues affect only version 13, but many affect all supported versions.
Some of these fixes include:
Completely disable TLS/SSL renegotiation. This was previously disabled, but the server would still execute a client-initiated renegotiation request.
Restore the Portal-level snapshot after COMMIT or ROLLBACK within a procedure. This change fixes cases where an attempt to fetch a toasted value immediately after COMMIT/ROLLBACK would fail with errors like "no known snapshots" or "missing chunk number 0 for toast value".
Avoid misbehavior when persisting the output of a cursor that's reading a volatile query.
Reject cases where a query in WITH rewrites to just NOTIFY, which would cause a crash.
Several corner-case fixes for numeric types.
ALTER EXTENSION now locks the extension when adding or removing a member object.
The "enabled" status is now copied when a partitioned table's triggers are cloned to a new partition.
Avoid alias conflicts in queries generated for REFRESH MATERIALIZED VIEW CONCURRENTLY. This command failed on materialized views containing columns with certain names, notably mv and newdata.
Disallow whole-row variables in GENERATED expressions.
Several fixes for DROP OWNED BY behavior in relation to row-level security (RLS) policies.
Re-allow old-style Windows locale names in CREATE COLLATION commands.
walsenders now show their latest replication command in pg_stat_activity, instead of just showing the latest SQL command.
pg_settings.pending_restart now shows as true when a pertinent entry in postgresql.conf is removed.
On 64-bit Windows, allow the effective value of work_mem * hash_mem_multiplier to exceed 2GB.
Update minimum recovery point when WAL replay of a transaction abort record causes file truncation.
Advance oldest-required-WAL-segment horizon properly after a replication slot is invalidated. This fixes an issue where the server's WAL storage could run out of space.
Improve progress reporting for the sort phase of a parallel B-tree index build.
Fix assorted crash cases in logical replication of partitioned-table updates and when firing AFTER triggers of partitioned tables.
Prevent infinite loops in SP-GiST index insertion.
Ensure that SP-GiST index insertion can be terminated by a query cancel request.
In psql and other client programs, avoid overrunning the ends of strings when dealing with invalidly-encoded data.
Fix pg_dump to correctly handle triggers on partitioned tables whose enabled status is different from their parent triggers' status.
Avoid "invalid creation date in header" warnings when running pg_restore on a file created in a different time zone.
pg_upgrade now carries forward the old installation's oldestXID value and no longer forces an anti-wraparound VACUUM."
Extend pg_upgrade to detect and warn about extensions that should be upgraded.
Fix contrib/postgres_fdw to better work with generated columns, so long as a generated column in a foreign table represents a generated column in the remote table.
PostgreSQL 13.3, 12.7, 11.12, 10.17, and 9.6.22 Released!
Posted on 2021-05-13 by PostgreSQL Global Development Group
PostgreSQL Project Security
The PostgreSQL Global Development Group has released an update to all supported versions of our database system, including 13.3, 12.7, 11.12, 10.17, and 9.6.22. This release closes three security vulnerabilities and fixes over 45 bugs reported over the last three months.
For the full list of changes, please review the release notes.
Security Issues
CVE-2021-32027: Buffer overrun from integer overflow in array subscripting calculations
Versions Affected: 9.6 - 13. The security team typically does not test unsupported versions, but this problem is quite old.
While modifying certain SQL array values, missing bounds checks let authenticated database users write arbitrary bytes to a wide area of server memory.
The PostgreSQL project thanks Tom Lane for reporting this problem.
CVE-2021-32028: Memory disclosure in INSERT ... ON CONFLICT ... DO UPDATE
Versions Affected: 9.6 - 13. The security team typically does not test unsupported versions. The feature first appeared in 9.5.
Using an INSERT ... ON CONFLICT ... DO UPDATE command on a purpose-crafted table, an attacker can read arbitrary bytes of server memory. In the default configuration, any authenticated database user can create prerequisite objects and complete this attack at will. A user lacking the CREATE and TEMPORARY privileges on all databases and the CREATE privilege on all schemas cannot use this attack at will.
The PostgreSQL project thanks Andres Freund for reporting this problem.
CVE-2021-32029: Memory disclosure in partitioned-table UPDATE ... RETURNING
Versions Affected: 11 - 13
Using an UPDATE ... RETURNING on a purpose-crafted partitioned table, an attacker can read arbitrary bytes of server memory. In the default configuration, any authenticated database user can create prerequisite objects and complete this attack at will. A user lacking the CREATE and TEMPORARY privileges on all databases and the CREATE privilege on all schemas typically cannot use this attack at will.
The PostgreSQL project thanks Tom Lane for reporting this problem.
Bug Fixes and Improvements
This update fixes over 45 bugs that were reported in the last several months. Some of these issues only affect version 13, but could also apply to other supported versions.
Some of these fixes include:
Fix potential incorrect computation of UPDATE ... RETURNING outputs for joined, cross-partition updates.
Fix ALTER TABLE ... ALTER CONSTRAINT when used on foreign-key constraints on partitioned tables. The command would fail to adjust the DEFERRABLE and/or INITIALLY DEFERRED properties of the constraints and triggers of leaf partitions, leading to unexpected behavior. After updating to this version, you can execute the ALTER TABLE ... ALTER CONSTRAINT command to fix any misbehaving partitioned tables.
Ensure that when a child table is attached with ALTER TABLE ... INHERIT that generated columns in the parent are generated in the same way in the child.
Forbid marking an identity column as NULL.
Allow ALTER ROLE ... SET/ALTER DATABASE ... SET to set the role, session_authorization, and temp_buffers parameters.
Ensure that REINDEX CONCURRENTLY preserves any statistics target set for the index.
Fix an issue where, in some cases, saving records within AFTER triggers could cause crashes.
Fix how to_char() handles Roman-numeral month format codes with negative intervals.
Fix use of uninitialized value while parsing an \{m,n\} quantifier in a BRE-mode regular expression.
Fix "could not find pathkey item to sort" planner errors that occur in some situations when the sort key involves an aggregate or window function.
Fix issue with BRIN index bitmap scans that could lead to "could not open file" errors.
Fix potentially wrong answers from GIN tsvector index searches when there are many matching records.
Fixes for COMMIT AND CHAIN functionality on both the server and psql.
Avoid incorrect timeline change while recovering uncommitted two-phase transactions from WAL, which could lead to consistency issues and the inability to restart the server.
Ensure thatwal_sync_method is set to fdatasync by default on newer FreeBSD releases.
Disable the vacuum_cleanup_index_scale_factor parameter and storage option.
Fix several memory leaks in the server, including one with SSL/TLS parameter initialization.
Restore the previous behavior of \connect service=XYZ to psql, i.e. disallow environmental variables (e.g. PGPORT) from overriding entries in the service file.
Fix how pg_dump handles generated columns in partitioned tables.
Add additional checks to pg_upgrade for user tables containing non-upgradable data types.
On Windows, initdb now prints instructions about how to start the server with pg_ctl using backslash separators.
Fix pg_waldump to count XACT records correctly when generating per-record statistics.
PostgreSQL 13.1, 12.5, 11.10, 10.15, 9.6.20, and 9.5.24
Security Issues
* CVE-2020-25695: Multiple features escape "security restricted operation" sandbox
* CVE-2020-25694: Reconnection can downgrade connection security settings
* CVE-2020-25696: psql's \gset allows overwriting specially treated variables
Bug Fixes and Improvements
This update also fixes over 65 bugs that were reported in the last several months. Some of these issues only affect version 13, but may also apply to other supported versions.
Some of these fixes include:
Fix a breakage in the replication protocol by ensuring that two "command completion" events are expected for START_REPLICATION.
Ensure fsync is called on the SLRU caches that PostgreSQL maintains. This prevents potential data loss due to an operating system crash.
Fix ALTER ROLE usage for users with the BYPASSRLS permission.
ALTER TABLE ONLY ... DROP EXPRESSION is disallowed on partitioned tables when there are child tables.
Ensure that ALTER TABLE ONLY ... ENABLE/DISABLE TRIGGER does not apply to child tables.
Fix for ALTER TABLE ... SET NOT NULL on partitioned tables to avoid a potential deadlock in parallel pg_restore.
Fix handling of expressions in CREATE TABLE LIKE with inheritance.
DROP INDEX CONCURRENTLY is disallowed on partitioned tables.
Allow LOCK TABLE to succeed on a self-referential view instead of throwing an error.
Several fixes around statistics collection and progress reporting for REINDEX CONCURRENTLY.
Ensure that GENERATED columns are updated when any columns they depend on are updated via a rule or an updatable view.
Support hash partitioning with text array columns as partition keys.
Allow the jsonpath .datetime() method to accept ISO 8601-format timestamps.
During a "smart" shutdown, ensure background processes are not terminated until all foreground client sessions are completed, fixing an issue that broke the processing of parallel queries.
Several fixes for the query planner and optimizer.
Ensure that data is de-toasted before being inserted into a BRIN index. This could manifest itself with errors like "missing chunk number 0 for toast value NNN". If you have seen a similar error in an existing BRIN index, you should be able to correct it by using REINDEX on the index.
Fix the output of EXPLAIN to have the correct XML tag nesting for incremental sort plans.
Several fixes for memory leaks, including ones involving RLS policies, using CALL with PL/pgSQL, SIGHUP processing a configuration parameter that cannot be applied without a restart, and an edge-case for index lookup for a partition.
libpq can now support arbitrary-length lines in the .pgpass file.
On Windows, psql now reads the output of a backtick command in text mode, not binary mode, so it can now properly handle newlines.
Fix how pg_dump, pg_restore, clusterdb, reindexdb, and vacuumdb use complex connection-string parameters.
When the \connect command of psql reuses connection parameters, ensure that all non-overridden parameters from a previous connection string are also re-used.
Ensure that pg_dump collects per-column information about extension configuration tables, avoiding crashes when specifying --inserts.
Ensure that parallel pg_restore processes foreign keys referencing partitioned tables in the correct order.
Several fixes for contrib/pgcrypto, including a memory leak fix.
PostgreSQL 12.4, 11.9, 10.14, 9.6.19, 9.5.23
Security Issues
CVE-2020-14349: Uncontrolled search path element in logical replication.
Versions Affected: 10 - 12.
The PostgreSQL search_path setting determines schemas searched for tables, functions, operators, etc. The CVE-2018-1058 fix caused most PostgreSQL-provided client applications to sanitize search_path, but logical replication continued to leave search_path unchanged. Users of a replication publisher or subscriber database can create objects in the public schema and harness them to execute arbitrary SQL functions under the identity running replication, often a superuser. Installations having adopted a documented secure schema usage pattern are not vulnerable.
The PostgreSQL project thanks Noah Misch for reporting this problem.
CVE-2020-14350: Uncontrolled search path element in CREATE EXTENSION.
Versions Affected: 9.5 - 12. The security team typically does not test unsupported versions, but this problem is quite old.
When a superuser runs certain CREATE EXTENSION statements, users may be able to execute arbitrary SQL functions under the identity of that superuser. The attacker must have permission to create objects in the new extension's schema or a schema of a prerequisite extension. Not all extensions are vulnerable.
In addition to correcting the extensions provided with PostgreSQL, the PostgreSQL Global Development Group is issuing guidance for third-party extension authors to secure their own work.
Bug Fixes and Improvements
This update also fixes over 50 bugs that were reported in the last several months. Some of these issues affect only version 12, but many affect all supported versions.
Some of these fixes include:
Fix edge cases in partition pruning involving multiple partition key columns with multiple or no constraining WHERE clauses.
Several fixes for query planning and execution involving partitions.
Fix for determining when to execute a column-specific UPDATE trigger on a logical replication subscriber.
pg_replication_slot_advance() now updates the oldest xmin and LSN values, as the failure to do this could prevent resources (e.g. WAL files) from being cleaned up.
Fix a performance regression in ts_headline().
Ensure that pg_read_file() and related functions read until EOF is reached, which fixes compatibility with pipes and other virtual files.
Forbid numeric NaN values in jsonpath computations, which do not exist in SQL nor JSON.
Several fixes for NaN inputs with aggregate functions. This fixes a change in PostgreSQL 12 where NaN values caused the following aggregates to emit values of 0 instead of NaN: corr(), covar_pop(), regr_intercept(), regr_r2(), regr_slope(), regr_sxx(), regr_sxy(), regr_syy(), stddev_pop(), and var_pop().
time and timetz values fractionally greater than 24:00:00 are now rejected.
Several fixes for EXPLAIN, including a fix for reporting resource usage when a plan uses parallel workers with "Gather Merge" nodes.
Fix timing of constraint revalidation in ALTER TABLE that could lead to odd errors.
Fix for REINDEX CONCURRENTLY that could prevent old values from being included in future logical decoding output.
Fix for LATERAL references that could potentially cause crashes during query execution.
Use the collation specified for a query when estimating operator costs
Fix conflict-checking anomalies in SERIALIZABLE transaction isolation mode.
Ensure checkpointer process discards file sync requests when fsync is off
Fix issue where pg_control could be written out with an inconsistent checksum, which could lead to the inability to restart the database if it crashed before the next pg_control update.
Ensure that libpq continues to try to read from the database connection socket after a write failure, as this allows the connection to collect any final error messages from the server.
Report out-of-disk-space errors properly in pg_dump and pg_basebackup
Several fixes for pg_restore, including a fix for parallel restore on tables that have both table-level and column-level privileges.
Fix for pg_upgrade to ensure it runs with vacuum_defer_cleanup_age set to 0.
Fix how pg_rewind handles just-deleted files in the source data directory
Fix failure to initialize local state correctly in contrib/dblink, which could lead to dblink_close() issuing an unexpected COMMIT on the remote server.
Change contrib/amcheck to not report about deleted index pages that are empty, as this is normal during WAL replay.
PostgreSQL 12.2, 11.7, 10.12, 9.6.17, 9.5.21, and 9.4.26
PostgreSQL 9.4 Now EOL
This is the last release for PostgreSQL 9.4, which will no longer receive security updates and bug fixes. PostgreSQL 9.4 introduced new features such as JSONB support, the ALTER SYSTEM command, the ability to stream logical changes to an output plugin, and more.
While we are very proud of this release, these features are also found in newer versions of PostgreSQL. Many of these features have also received improvements, and, per our versioning policy, it is time to retire PostgreSQL 9.4.
To receive continued support, we suggest that you make plans to upgrade to a newer, supported version of PostgreSQL. Please see the PostgreSQL versioning policy for more information.
Security Issues
CVE-2020-1720: ALTER ... DEPENDS ON EXTENSION is missing authorization checks.
Versions Affected: 9.6 - 12
The ALTER ... DEPENDS ON EXTENSION sub-commands do not perform authorization checks, which can allow an unprivileged user to drop any function, procedure, materialized view, index, or trigger under certain conditions. This attack is possible if an administrator has installed an extension and an unprivileged user can CREATE, or an extension owner either executes DROP EXTENSION predictably or can be convinced to execute DROP EXTENSION.
Bug Fixes and Improvements
This update also fixes over 75 bugs that were reported in the last several months. Some of these issues affect only version 12, but may also affect all supported versions.
Some of these fixes include:
Fix for partitioned tables with foreign-key references where TRUNCATE ... CASCADE would not remove all data. If you have previously used TRUNCATE ... CASCADE on a partitioned table with foreign-key references please see the "Updating" section for verification and cleanup steps.
Fix failure to add foreign key constraints to table with sub-partitions (aka a multi-level partitioned table). If you have previously used this functionality, you can fix it by either detaching and re-attaching the affected partition, or by dropping and re-adding the foreign key constraint to the parent table. You can find more information on how to perform these steps in the ALTER TABLE documentation.
Fix performance issue for partitioned tables introduced by the fix for CVE-2017-7484 that now allows the planner to use statistics on a child table for a column that the user is granted access to on the parent table when the query contains a leaky operator.
Several other fixes and changes for partitioned tables, including disallowing partition key expressions that return pseudo-types, such as RECORD.
Fix for logical replication subscribers for executing per-column UPDATE triggers.
Fix for several crashes and failures for logical replication subscribers and publishers.
Improve efficiency of logical replication with REPLICA IDENTITY FULL.
Ensure that calling pg_replication_slot_advance() on a physical replication slot will persist changes across restarts.
Several fixes for the walsender processes.
Improve performance of hash joins with very large inner relations.
Fix placement of "Subplans Removed" field in EXPLAIN output by placing it with its parent Append or MergeAppend plan.
Several fixes for parallel query plans.
Several fixes for query planner errors, including one that affected joins to single-row subqueries.
Several fixes for MCV extend statistics, including one for incorrect estimation for OR clauses.
Improve efficiency of parallel hash join on CPUs with many cores.
Ignore the CONCURRENTLY option when performing an index creation, drop, or reindex on a temporary table.
Fall back to non-parallel index builds when a parallelized CREATE INDEX has no free dynamic shared memory slots.
Several fixes for GiST & GIN indexes.
Fix possible crash in BRIN index operations with box, range and inet data types.
Fix support for BRIN hypothetical indexes.
Fix failure in ALTER TABLE when a column referenced in a GENERATED expression is added or changed in type earlier in the same ALTER TABLE statement.
Fix handling of multiple AFTER ROW triggers on a foreign table.
Fix off-by-one result for EXTRACT(ISOYEAR FROM timestamp) for BC dates.
Prevent unwanted lowercasing and truncation of RADIUS authentication parameters in the pg_hba.conf file.
Several fixes for GSSAPI support, including having libpq accept all GSS-related connection parameters even if the GSSAPI code is not compiled in.
Several fixes for pg_dump and pg_restore when run in parallel mode.
Fix crash with postgres_fdw when trying to execute a remote query on the remote server such as UPDATE remote_tab SET (x,y) = (SELECT ...).
Disallow NULL category values in the crosstab() function of contrib/tablefunc to prevent crashes.
Several fixes for Windows, including a race condition that could cause timing oddities with NOTIFY.
Several ecpg fixes.
Release 12:
General performance improvements, including:
* Optimizations to space utilization and read/write performance for B-tree indexes
* Partitioning performance enhancements, including improved query performance on tables with thousands of partitions, improved insertion performance with INSERT and COPY, and the ability to execute ALTER TABLE ATTACH PARTITION without blocking queries
* Automatic (but overridable) inlining of common table expressions (CTEs)
* Reduction of WAL overhead for creation of GiST, GIN, and SP-GiST indexes
* Support for covering GiST indexes, via the INCLUDE clause
* Multi-column most-common-value (MCV) statistics can be defined via CREATE STATISTICS, to support better plans for queries that test several non-uniformly-distributed columns
Enhancements to administrative functionality, including:
* REINDEX CONCURRENTLY can rebuild an index without blocking writes to its table
* pg_checksums can enable/disable page checksums (used for detecting data corruption) in an offline cluster
* Progress reporting statistics for CREATE INDEX, REINDEX, CLUSTER, VACUUM FULL, and pg_checksums
Support for the SQL/JSON path language
Stored generated columns
Nondeterministic ICU collations, enabling case-insensitive and accent-insensitive grouping and ordering
New authentication features, including:
* Encryption of TCP/IP connections when using GSSAPI authentication
* Discovery of LDAP servers using DNS SRV records
* Multi-factor authentication, using the clientcert=verify-full option combined with an additional authentication method in pg_hba.conf
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