2021-03-18 15:58:15 +01:00
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Copyright (C) Internet Systems Consortium, Inc. ("ISC")
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This Source Code Form is subject to the terms of the Mozilla Public
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License, v. 2.0. If a copy of the MPL was not distributed with this
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file, you can obtain one at https://mozilla.org/MPL/2.0/.
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See the COPYRIGHT file distributed with this work for additional
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information regarding copyright ownership.
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Notes for BIND 9.17.12
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----------------------
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Security Fixes
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~~~~~~~~~~~~~~
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2021-02-03 11:21:16 +11:00
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- A malformed incoming IXFR transfer could trigger an assertion failure
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in ``named``, causing it to quit abnormally. (CVE-2021-25214)
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ISC would like to thank Greg Kuechle of SaskTel for bringing this
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vulnerability to our attention. [GL #2467]
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2021-03-18 15:58:15 +01:00
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2021-03-01 16:08:21 +11:00
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- ``named`` crashed when a DNAME record placed in the ANSWER section
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during DNAME chasing turned out to be the final answer to a client
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query. (CVE-2021-25215)
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ISC would like to thank `Siva Kakarla`_ for bringing this
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vulnerability to our attention. [GL #2540]
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.. _Siva Kakarla: https://github.com/sivakesava1
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2021-03-18 15:58:15 +01:00
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Feature Changes
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~~~~~~~~~~~~~~~
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2021-04-12 12:15:45 +02:00
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- The ISC implementation of SPNEGO was removed from BIND 9 source code.
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Instead, BIND 9 now always uses the SPNEGO implementation provided by
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the system GSSAPI library when it is built with GSSAPI support. All
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major contemporary Kerberos/GSSAPI libraries contain an implementation
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of the SPNEGO mechanism. This change was introduced in BIND 9.17.2,
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but it was not included in the release notes at the time. [GL #2607]
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2021-03-18 15:58:15 +01:00
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2021-04-02 14:33:54 +02:00
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- The default value for the ``stale-answer-client-timeout`` option was
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changed from ``1800`` (ms) to ``off``. The default value may be
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changed again in future releases as this feature matures. [GL #2608]
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2021-03-18 15:58:15 +01:00
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Bug Fixes
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~~~~~~~~~
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2021-04-12 12:15:45 +02:00
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- TCP idle and initial timeouts were being incorrectly applied: only the
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``tcp-initial-timeout`` was applied on the whole connection, even if
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the connection were still active, which could prevent a large zone
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transfer from being sent back to the client. The default setting for
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``tcp-initial-timeout`` was 30 seconds, which meant that any TCP
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connection taking more than 30 seconds was abruptly terminated. This
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has been fixed. [GL #2583]
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2021-03-26 12:25:20 +01:00
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- When ``stale-answer-client-timeout`` was set to a positive value and
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2021-04-12 12:15:45 +02:00
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recursion for a client query completed when ``named`` was about to
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look for a stale answer, an assertion could fail in
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``query_respond()``, resulting in a crash. This has been fixed.
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[GL #2594]
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- After upgrading to the previous release, journal files for trust
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anchor databases (e.g. ``managed-keys.bind.jnl``) could be left in a
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corrupt state. (Other zone journal files were not affected.) This has
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been fixed. If a corrupt journal file is detected, ``named`` can now
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recover from it. [GL #2600]
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Fix nonsensical stale TTL values in cache dump
When introducing change 5149, "rndc dumpdb" started to print a line
above a stale RRset, indicating how long the data will be retained.
At that time, I thought it should also be possible to load
a cache from file. But if a TTL has a value of 0 (because it is stale),
stale entries wouldn't be loaded from file. So, I added the
'max-stale-ttl' to TTL values, and adjusted the $DATE accordingly.
Since we actually don't have a "load cache from file" feature, this
is premature and is causing confusion at operators. This commit
changes the 'max-stale-ttl' adjustments.
A check in the serve-stale system test is added for a non-stale
RRset (longttl.example) to make sure the TTL in cache is sensible.
Also, the comment above stale RRsets could have nonsensical
values. A possible reason why this may happen is when the RRset was
marked a stale but the 'max-stale-ttl' has passed (and is actually an
RRset awaiting cleanup). This would lead to the "will be retained"
value to be negative (but since it is stored in an uint32_t, you would
get a nonsensical value (e.g. 4294362497).
To mitigate against this, we now also check if the header is not
ancient. In addition we check if the stale_ttl would be negative, and
if so we set it to 0. Most likely this will not happen because the
header would already have been marked ancient, but there is a possible
race condition where the 'rdh_ttl + serve_stale_ttl' has passed,
but the header has not been checked for staleness.
2021-03-10 12:09:16 +01:00
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2021-04-12 12:15:45 +02:00
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- When sending queries over TCP, ``dig`` now properly handles ``+tries=1
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+retry=0`` by not retrying the connection when the remote server
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closes the connection prematurely. [GL #2490]
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2021-04-12 12:15:45 +02:00
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- CDS/CDNSKEY DELETE records are now removed when a zone transitions
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from a secure to an insecure state. ``named-checkzone`` also no longer
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reports an error when such records are found in an unsigned zone.
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[GL #2517]
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- Zones using KASP could not be thawed after they were frozen using
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``rndc freeze``. This has been fixed. [GL #2523]
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- After ``rndc checkds -checkds`` or ``rndc dnssec -rollover`` is used,
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``named`` now immediately attempts to reconfigure zone keys. This
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change prevents unnecessary key rollover delays. [GL #2488]
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- ``named`` crashed after skipping a primary server while transferring a
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zone over TLS. This has been fixed. [GL #2562]
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