Package "libpq5"

  postgresql-16 (16.6-0ubuntu0.24.10.1) oracular-security; urgency=medium

  * New upstream version (LP: #2085196).

    + This release encompasses changes from upstream's 16.5 and 16.6
      releases. The former contains fixes for 4 CVEs (among other
      things), and the latter was hotfix for a problem caused by one of
      the CVE fixes from 16.5.

    + A dump/restore is not required for those running 16.X.

    + However, if you are upgrading from a version earlier than 16.3, see
      those release notes as well please.

    + Ensure cached plans are marked as dependent on the calling role when
      RLS applies to a non-top-level table reference (Nathan Bossart)

      If a CTE, subquery, sublink, security invoker view, or coercion
      projection in a query references a table with row-level security
      policies, we neglected to mark the resulting plan as potentially
      dependent on which role is executing it. This could lead to later query
      executions in the same session using the wrong plan, and then returning
      or hiding rows that should have been hidden or returned instead.

      The PostgreSQL Project thanks Wolfgang Walther for reporting this
      problem.
      (CVE-2024-10976)

    + Make libpq discard error messages
      received during SSL or GSS protocol negotiation (Jacob Champion)

      An error message received before encryption negotiation is completed
      might have been injected by a man-in-the-middle, rather than being real
      server output. Reporting it opens the door to various security hazards;
      for example, the message might spoof a query result that a careless user
      could mistake for correct output. The best answer seems to be to
      discard such data and rely only on libpq's own report of the connection
      failure.

      The PostgreSQL Project thanks Jacob Champion for reporting this
      problem.
      (CVE-2024-10977)

    + Fix unintended interactions between SET SESSION AUTHORIZATION
      and SET ROLE (Tom Lane)

      The SQL standard mandates that SET SESSION AUTHORIZATION have a
      side-effect of doing SET ROLE NONE. Our implementation of that was
      flawed, creating more interaction between the two settings than
      intended. Notably, rolling back a transaction that had done SET SESSION
      AUTHORIZATION would revert ROLE to NONE even if that had not been the
      previous state, so that the effective user ID might now be different
      from what it had been before the transaction. Transiently setting
      session_authorization in a function SET clause had a similar effect. A
      related bug was that if a parallel worker inspected
      current_setting('role'), it saw none even when it should see something
      else.

      The PostgreSQL Project thanks Tom Lane for reporting this problem.
      (CVE-2024-10978)

    + Prevent trusted PL/Perl code from changing environment variables
      (Andrew Dunstan, Noah Misch)

      The ability to manipulate process environment variables such as PATH
      gives an attacker opportunities to execute arbitrary code. Therefore,
      trustedPLs must not offer the ability to do that. To fix plperl,
      replace %ENV with a tied hash that rejects any modification attempt with
      a warning. Untrusted plperlu retains the ability to change the
      environment.

      The PostgreSQL Project thanks Coby Abrams for reporting this problem.
      (CVE-2024-10979)

    + Restore functionality of ALTER {ROLE|DATABASE} SET
      role (Tom Lane, Noah Misch)

      The fix for CVE-2024-10978 accidentally caused settings for role to
      not be applied if they come from non-interactive sources, including
      previous ALTER {ROLE|DATABASE} commands and the PGOPTIONS environment
      variable.

    + Details about these and many further changes can be found at:
      https://www.postgresql.org/docs/16/release-16-5.html and
      https://www.postgresql.org/docs/16/release-16-6.html.

  * d/postgresql-16.NEWS: Create.

 -- Sergio Durigan Junior <email address hidden> Mon, 25 Nov 2024 16:05:41 -0500