diff --git a/doc/arm/changelog.rst b/doc/arm/changelog.rst index 71195ee099..d23a87e873 100644 --- a/doc/arm/changelog.rst +++ b/doc/arm/changelog.rst @@ -18,6 +18,7 @@ Changelog development. Regular users should refer to :ref:`Release Notes ` for changes relevant to them. +.. include:: ../changelog/changelog-9.20.20.rst .. include:: ../changelog/changelog-9.20.19.rst .. include:: ../changelog/changelog-9.20.18.rst .. include:: ../changelog/changelog-9.20.17.rst diff --git a/doc/arm/notes.rst b/doc/arm/notes.rst index b56f52cdd1..ba33babf79 100644 --- a/doc/arm/notes.rst +++ b/doc/arm/notes.rst @@ -45,6 +45,7 @@ The list of known issues affecting the latest version in the 9.20 branch can be found at https://gitlab.isc.org/isc-projects/bind9/-/wikis/Known-Issues-in-BIND-9.20 +.. include:: ../notes/notes-9.20.20.rst .. include:: ../notes/notes-9.20.19.rst .. include:: ../notes/notes-9.20.18.rst .. include:: ../notes/notes-9.20.17.rst diff --git a/doc/changelog/changelog-9.20.20.rst b/doc/changelog/changelog-9.20.20.rst new file mode 100644 index 0000000000..ab19efcee3 --- /dev/null +++ b/doc/changelog/changelog-9.20.20.rst @@ -0,0 +1,158 @@ +.. Copyright (C) Internet Systems Consortium, Inc. ("ISC") +.. +.. SPDX-License-Identifier: MPL-2.0 +.. +.. This Source Code Form is subject to the terms of the Mozilla Public +.. License, v. 2.0. If a copy of the MPL was not distributed with this +.. file, you can obtain one at https://mozilla.org/MPL/2.0/. +.. +.. See the COPYRIGHT file distributed with this work for additional +.. information regarding copyright ownership. + +BIND 9.20.20 +------------ + +Feature Changes +~~~~~~~~~~~~~~~ + +- Record query time for all dnstap responses. ``f4fdcee03f1`` + + Not all DNS responses had the query time set in their corresponding + dnstap messages. This has been fixed. :gl:`#3695` :gl:`!11534` + +- Implement Fisher-Yates shuffle for nameserver selection. + ``dd453590a0e`` + + Replace the two-pass "random start index and wrap around" logic in + fctx_getaddresses_nameservers() with a statistically sound partial + Fisher-Yates shuffle. + + The previous implementation picked a random starting node and did two + passes over the linked list to find query candidates. The new logic + introduces fctx_getaddresses_nsorder() to perform an in-place + randomization of indices into a bounded, stack-allocated lookup array + (nsorder) representing the "winning" fetch slots. + + The nameserver dataset is now traversed in exactly one sequential + pass: 1. Every nameserver is evaluated for local cached data. 2. If + the current nameserver's sequential index exists in the randomized + nsorder array, it is permitted to launch an outgoing network fetch. 3. + If not, it is restricted to local lookups via DNS_ADBFIND_NOFETCH. + + This guarantees a fair random distribution for outbound queries while + maximizing local cache hits, entirely within O(1) memory and without + the overhead of linked-list pointer shuffling or dynamic allocation. + :gl:`#5695` :gl:`!11606` + +- Invalid NSEC3 can cause OOB read of the isdelegation() stack. + ``e6f234169e2`` + + When .next_length is longer than NSEC3_MAX_HASH_LENGTH, it causes a + harmless out-of-bound read of the isdelegation() stack. This has been + fixed. :gl:`#5749` :gl:`!11594` + +- Optimize the TCP source port selection on Linux. ``d4426f85b36`` + + Enable a socket option on the outgoing TCP sockets to allow faster + selection of the source tuple for different destination + tuples when nearing over 70-80% of the source port + utilization. :gl:`!11573` + +Bug Fixes +~~~~~~~~~ + +- Fix errors when retrying over TCP in notify_send_toaddr. + ``a1232333196`` + + If the source address is not available do not attempt to retry over + TCP otherwise clear the TSIG key from the message prior to retrying. + :gl:`#5457` :gl:`!11567` + +- Fetch loop detection improvements. ``892c3e78926`` + + Fixes a case where an in-domain NS with an expired glue would fail to + resolve. + + Let's consider the following parent-side delegation (both for + `foo.example.` and `dnshost.example.` + + ``` foo.example. 3600 NS ns.dnshost.example. + dnshost.example. 3600 NS ns.dnshost.example. + ns.dnshost.example. 3600 A 1.2.3.4 ``` Then the + child-side of `dnshost.example.`: + + ``` dnshost.example. 300 NS ns.dnshost.example. + ns.dnshost.example. 300 A 1.2.3.4 ``` And then the + child-side of `foo.example.`: + + ``` foo.example 3600 NS ns.dnshost.example. + a.foo.example 300 A 5.6.7.8 ``` + + While there is a zone misconfiguration (the TTL of the delegation and + glue doesn't match in the parent and the child), it is possible to + resolve `a.foo.example` on a cold-cache resolver. However, after the + `ns.dnshost.example.` glue expires, the resolution would have failed + with a "fetch loop detected" error. This is now fixed. :gl:`#5588` + :gl:`!11547` + +- Remove deterministic selection of nameserver. ``c6c6e490fd8`` + + When selecting nameserver addresses to be looked up we where always + selecting them in dnssec name order from the start of the nameserver + rrset. This could lead to resolution failure despite there being + address that could be resolved for the other names. Use a random + starting point when selecting which names to lookup. :gl:`#5695` + :gl:`#5745` :gl:`!11600` + +- DNSTAP wasn't logging forwarded queries correctly. ``0a5922bcf7a`` + + :gl:`#5724` :gl:`!11555` + +- Fix read UAF in BIND9 dns_client_resolve() via DNAME Response. + ``c0c4bf526a1`` + + An attacker controlling a malicious DNS server returns a DNAME record, + and the we stores a pointer to resp->foundname, frees the response + structure, then uses the dangling pointer in dns_name_fullcompare() + possibly causing invalid match. Only the `delv`is affected. This has + been fixed. :gl:`#5728` :gl:`!11571` + +- Clear serve-stale flags when following the CNAME chains. + ``68fb2312948`` + + A stale answer could have been served in case of multiple upstream + failures when following the CNAME chains. This has been fixed. + :gl:`#5751` :gl:`!11583` + +- Fail DNSKEY validation when supported but invalid DS is found. + ``2e1971873a1`` + + A regression was introduced when adding the EDE code for unsupported + DNSKEY and DS algorithms. When the parent has both supported and + unsupported algorithm in the DS record, the validator would treat the + supported DS algorithm as insecure when validating DNSKEY records + instead of BOGUS. This has not security impact as the rest of the + child zone correctly ends with BOGUS status, but it is incorrect and + thus the regression has been fixed. :gl:`#5757` :gl:`!11590` + +- Importing invalid SKR file might corrupt stack memory. ``9869a14ce3a`` + + If an BIND 9 administrator imports an invalid SKR file, local stack in + the import function might overflow. This could lead to a memory + corruption on the stack and ultimately server crash. This has been + fixed. + + ISC would like to thank mcsky23 for bringing this bug to our + attention. :gl:`#5758` :gl:`!11598` + +- Do not update the case on unchanged rdatasets. ``8931f82dc8b`` + + Fix assertion failure on unchanged rdataset during IXFR. :gl:`#5759` + :gl:`!11587` + +- Return FORMERR for ECS family 0. ``8ac316bf0f6`` + + RFC 7871 only defines family 1 (IPv4) and 2 (IPv6). Additionally it + requires FORMERR to be returned for all unknown families. :gl:`!11565` + + diff --git a/doc/notes/notes-9.20.20.rst b/doc/notes/notes-9.20.20.rst new file mode 100644 index 0000000000..cf87f30e53 --- /dev/null +++ b/doc/notes/notes-9.20.20.rst @@ -0,0 +1,98 @@ +.. Copyright (C) Internet Systems Consortium, Inc. ("ISC") +.. +.. SPDX-License-Identifier: MPL-2.0 +.. +.. This Source Code Form is subject to the terms of the Mozilla Public +.. License, v. 2.0. If a copy of the MPL was not distributed with this +.. file, you can obtain one at https://mozilla.org/MPL/2.0/. +.. +.. See the COPYRIGHT file distributed with this work for additional +.. information regarding copyright ownership. + +Notes for BIND 9.20.20 +---------------------- + +Security Fixes +~~~~~~~~~~~~~~ + +- Fix a use-after-free error in ``dns_client_resolve()`` triggered by a + DNAME response. + + This issue only affected the :iscman:`delv` tool and it has now been + fixed. + + ISC would like to thank Vitaly Simonovich for bringing this + vulnerability to our attention. :gl:`#5728` + +Feature Changes +~~~~~~~~~~~~~~~ + +- Record query time for all dnstap responses. + + Not all DNS responses had the query time set in their corresponding + dnstap messages. This has been fixed. :gl:`#3695` + +- Optimize TCP source port selection on Linux. + + Enable the ``IP_LOCAL_PORT_RANGE`` socket option on the outgoing TCP + sockets to allow faster selection of the source tuple + for different destination tuples, when nearing over + 70-80% of the source port utilization. :gl:`!11569` + +Bug Fixes +~~~~~~~~~ + +- Fix an assertion failure triggered by non-minimal IXFRs. + + Processing an IXFR that included an RRset whose contents were not + changed by the transfer triggered an assertion failure. This has been + fixed. :gl:`#5759` + +- Fix a crash when retrying a NOTIFY over TCP. + + Furthermore, do not attempt to retry over TCP at all if the source + address is not available. :gl:`#5457` + +- Fetch loop detection improvements. + + Fix a case where an in-domain nameserver with expired glue would fail + to resolve. :gl:`#5588` + +- Randomize nameserver selection. + + Since BIND 9.20.17, when selecting nameserver addresses to be looked + up, :iscman:`named` selected them in DNSSEC order from the start of + the NS RRset. This could lead to a resolution failure despite there + being an address that could be resolved using the other nameserver + names. :iscman:`named` now randomizes the order in which nameserver + addresses are looked up. :gl:`#5695` :gl:`#5745` + +- Fix dnstap logging of forwarded queries. :gl:`#5724` + +- A stale answer could have been served in case of multiple upstream + failures when following CNAME chains. This has been fixed. :gl:`#5751` + +- Fail DNSKEY validation when supported but invalid DS is found. + + A regression was introduced in BIND 9.20.6 when adding the EDE code + for unsupported DNSKEY and DS algorithms. When the parent had both + supported and unsupported algorithms in the DS record, the validator + would treat the supported DS algorithm as insecure instead of bogus + when validating DNSKEY records. This has no security impact, as the + rest of the child zone correctly ends with bogus status, but it is + incorrect and thus the regression has been fixed. :gl:`#5757` + +- Importing an invalid SKR file might corrupt stack memory. + + If an administrator imported an invalid SKR file, the local stack in + the import function might overflow. This could lead to a memory + corruption on the stack and ultimately a server crash. This has been + fixed. :gl:`#5758` + +- Return FORMERR for queries with the EDNS Client Subnet FAMILY field + set to 0. + + :rfc:`7871` only defines families 1 (IPv4) and 2 (IPv6), and requires + FORMERR to be returned for all unknown families. Queries with the EDNS + Client Subnet FAMILY field set to 0 now elicit responses with + RCODE=FORMERR. :gl:`!11565`