[ubuntu/precise-security] postgresql-9.1 9.1.5-0ubuntu12.04 (Accepted)
jamie at ubuntu.com
Mon Aug 20 21:25:47 UTC 2012
postgresql-9.1 (9.1.5-0ubuntu12.04) precise-security; urgency=low
* New upstream bug fix/security release:
- Prevent access to external files/URLs via XML entity references
(Noah Misch, Tom Lane)
xml_parse() would attempt to fetch external files or URLs as needed
to resolve DTD and entity references in an XML value, thus allowing
unprivileged database users to attempt to fetch data with the
privileges of the database server. While the external data wouldn't
get returned directly to the user, portions of it could be exposed
in error messages if the data didn't parse as valid XML; and in any
case the mere ability to check existence of a file might be useful
to an attacker. (CVE-2012-3489)
- Prevent access to external files/URLs via "contrib/xml2"'s
xslt_process() (Peter Eisentraut)
libxslt offers the ability to read and write both files and URLs
through stylesheet commands, thus allowing unprivileged database
users to both read and write data with the privileges of the
database server. Disable that through proper use of libxslt's
security options. (CVE-2012-3488)
Also, remove xslt_process()'s ability to fetch documents and
stylesheets from external files/URLs. While this was a documented
"feature", it was long regarded as a bad idea. The fix for
CVE-2012-3489 broke that capability, and rather than expend effort
on trying to fix it, we're just going to summarily remove it.
- Prevent too-early recycling of btree index pages (Noah Misch)
When we allowed read-only transactions to skip assigning XIDs, we
introduced the possibility that a deleted btree page could be
recycled while a read-only transaction was still in flight to it.
This would result in incorrect index search results. The
probability of such an error occurring in the field seems very low
because of the timing requirements, but nonetheless it should be
- Fix crash-safety bug with newly-created-or-reset sequences (Tom
If "ALTER SEQUENCE" was executed on a freshly created or reset
sequence, and then precisely one nextval() call was made on it, and
then the server crashed, WAL replay would restore the sequence to a
state in which it appeared that no nextval() had been done, thus
allowing the first sequence value to be returned again by the next
nextval() call. In particular this could manifest for serial
columns, since creation of a serial column's sequence includes an
"ALTER SEQUENCE OWNED BY" step.
- Fix race condition in enum-type value comparisons (Robert Haas, Tom
Comparisons could fail when encountering an enum value added since
the current query started.
- Fix txid_current() to report the correct epoch when not in hot
standby (Heikki Linnakangas)
This fixes a regression introduced in the previous minor release.
- Prevent selection of unsuitable replication connections as the
synchronous standby (Fujii Masao)
The master might improperly choose pseudo-servers such as
pg_receivexlog or pg_basebackup as the synchronous standby, and
then wait indefinitely for them.
- Fix bug in startup of Hot Standby when a master transaction has
many subtransactions (Andres Freund)
This mistake led to failures reported as "out-of-order XID
insertion in KnownAssignedXids".
- Ensure the "backup_label" file is fsync'd after pg_start_backup()
- Fix timeout handling in walsender processes (Tom Lane)
WAL sender background processes neglected to establish a SIGALRM
handler, meaning they would wait forever in some corner cases where
a timeout ought to happen.
- Wake walsenders after each background flush by walwriter (Andres
Freund, Simon Riggs)
This greatly reduces replication delay when the workload contains
only asynchronously-committed transactions.
- Fix LISTEN/NOTIFY to cope better with I/O problems, such as out of
disk space (Tom Lane)
After a write failure, all subsequent attempts to send more NOTIFY
messages would fail with messages like "Could not read from file
"pg_notify/nnnn" at offset nnnnn: Success".
- Only allow autovacuum to be auto-canceled by a directly blocked
process (Tom Lane)
The original coding could allow inconsistent behavior in some
cases; in particular, an autovacuum could get canceled after less
than deadlock_timeout grace period.
- Improve logging of autovacuum cancels (Robert Haas)
- Fix log collector so that log_truncate_on_rotation works during the
very first log rotation after server start (Tom Lane)
- Fix WITH attached to a nested set operation
(UNION/INTERSECT/EXCEPT) (Tom Lane)
- Ensure that a whole-row reference to a subquery doesn't include any
extra GROUP BY or ORDER BY columns (Tom Lane)
- Fix dependencies generated during ALTER TABLE ... ADD CONSTRAINT
USING INDEX (Tom Lane)
This command left behind a redundant pg_depend entry for the index,
which could confuse later operations, notably ALTER TABLE ... ALTER
COLUMN TYPE on one of the indexed columns.
- Fix "REASSIGN OWNED" to work on extensions (Alvaro Herrera)
- Disallow copying whole-row references in CHECK constraints and
index definitions during "CREATE TABLE" (Tom Lane)
This situation can arise in "CREATE TABLE" with LIKE or INHERITS.
The copied whole-row variable was incorrectly labeled with the row
type of the original table not the new one. Rejecting the case
seems reasonable for LIKE, since the row types might well diverge
later. For INHERITS we should ideally allow it, with an implicit
coercion to the parent table's row type; but that will require more
work than seems safe to back-patch.
- Fix memory leak in ARRAY(SELECT ...) subqueries (Heikki
Linnakangas, Tom Lane)
- Fix planner to pass correct collation to operator selectivity
estimators (Tom Lane)
This was not previously required by any core selectivity estimation
function, but third-party code might need it.
- Fix extraction of common prefixes from regular expressions (Tom
The code could get confused by quantified parenthesized
subexpressions, such as ^(foo)?bar. This would lead to incorrect
index optimization of searches for such patterns.
- Fix bugs with parsing signed "hh":"mm" and "hh":"mm":"ss" fields in
interval constants (Amit Kapila, Tom Lane)
- Fix pg_dump to better handle views containing partial GROUP BY
lists (Tom Lane)
A view that lists only a primary key column in GROUP BY, but uses
other table columns as if they were grouped, gets marked as
depending on the primary key. Improper handling of such primary key
dependencies in pg_dump resulted in poorly-ordered dumps, which at
best would be inefficient to restore and at worst could result in
outright failure of a parallel pg_restore run.
- In PL/Perl, avoid setting UTF8 flag when in SQL_ASCII encoding
(Alex Hunsaker, Kyotaro Horiguchi, Alvaro Herrera)
- Use Postgres' encoding conversion functions, not Python's, when
converting a Python Unicode string to the server encoding in
PL/Python (Jan Urbanski)
This avoids some corner-case problems, notably that Python doesn't
support all the encodings Postgres does. A notable functional
change is that if the server encoding is SQL_ASCII, you will get
the UTF-8 representation of the string; formerly, any non-ASCII
characters in the string would result in an error.
- Fix mapping of PostgreSQL encodings to Python encodings in
PL/Python (Jan Urbanski)
- Report errors properly in "contrib/xml2"'s xslt_process() (Tom
- Update time zone data files to tzdata release 2012e for DST law
changes in Morocco and Tokelau
Date: 2012-08-16 22:35:36.907754+00:00
Changed-By: Jamie Strandboge <jamie at ubuntu.com>
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