diff --git a/doc/arm/changelog.rst b/doc/arm/changelog.rst index 7100beb402..874f9d2a0c 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-9.18.49.rst .. include:: ../changelog/changelog-9.18.48.rst .. include:: ../changelog/changelog-9.18.47.rst .. include:: ../changelog/changelog-9.18.46.rst diff --git a/doc/arm/notes.rst b/doc/arm/notes.rst index 8f069eab60..223a49bb2f 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 9.18 branch can be found at https://gitlab.isc.org/isc-projects/bind9/-/wikis/Known-Issues-in-BIND-9.18 +.. include:: ../notes/notes-9.18.49.rst .. include:: ../notes/notes-9.18.48.rst .. include:: ../notes/notes-9.18.47.rst .. include:: ../notes/notes-9.18.46.rst diff --git a/doc/changelog/changelog-9.18.49.rst b/doc/changelog/changelog-9.18.49.rst new file mode 100644 index 0000000000..247431adb0 --- /dev/null +++ b/doc/changelog/changelog-9.18.49.rst @@ -0,0 +1,226 @@ +.. 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 9.18.49 +------------ + +Security Fixes +~~~~~~~~~~~~~~ + +- Fix outgoing zone transfers' quota issue. ``694648e14b`` + + Unauthorized clients could consume outgoing zone transfers quota and + block authorized zone transfer clients. This has been fixed. + :gl:`#3589` + +- [CVE-2026-3592] Limit resolver server list size. ``5abfbc2663`` + + When resolving a domain with many nameservers that share overlapping + IP addresses (e.g., 10 NS records all pointing at the same set of + addresses), BIND could previously waste time querying duplicate + addresses and build up excessively large server lists. Deduplicate + addresses in the resolver's server list so that each unique IP is only + queried once per resolution attempt, regardless of how many NS records + point to it and cap the number of addresses stored per nameserver name + to 6 (combined A and AAAA), preventing memory and CPU overhead from + domains with unusually large NS/glue sets. :gl:`#5641` + +- [CVE-2026-3039] Fix GSS-API resource leak. ``03ce21cf30`` + + Fixed a memory leak where each GSS-API TKEY negotiation leaked a + security context inside the GSS library. An unauthenticated attacker + could exhaust server memory by sending repeated TKEY queries to a + server with tkey-gssapi-keytab configured. The leaked memory was + allocated by the GSS library, bypassing BIND's memory accounting. + + Multi-round GSS-API negotiation (GSS_S_CONTINUE_NEEDED) is now + rejected, as BIND never supported it correctly and Kerberos/SPNEGO + completes in a single round. + + Also implemented missing RFC 3645 requirement: the client now verifies + that mutual authentication and integrity flags are granted by the + GSS-API mechanism (Section 3.1.1). :gl:`#5752` + +- [CVE-2026-5950] Avoid unbounded recursion loop. ``43d173797e`` + + A bug during bad server handling could cause the resolver to enter an + infinite loop, continuously sending queries to an upstream server with + no exit condition, until the resolver query timeout was hit. This has + been fixed. + + ISC would like to thank Billy Baraja (BielraX) for bringing this issue + to our attention. :gl:`#5804` + +- [CVE-2026-5946] Disable recursion, UPDATE, and NOTIFY for non-IN + views. ``7ce6ce37b1`` + + Recursion, dynamic updates (UPDATE), and zone change notifications + (NOTIFY) are now disabled for views with a class other than IN (such + as CHAOS or HESIOD); authoritative service for non-IN zones (e.g. + version.bind in class CHAOS) continues to work as before. Servers + configured with recursion yes in a non-IN view will log a warning at + startup, and named-checkconf flags the same condition. UPDATE and + NOTIFY messages that specify the meta-classes ANY or NONE in the + question section are now rejected with FORMERR. + + This addresses a set of closely related security issues collectively + identified as CVE-2026-5946. ISC would like to thank Mcsky23 for + bringing these issues to our attention. + +Feature Changes +~~~~~~~~~~~~~~~ + +- Revert isdelegation() to return boolean value again. ``83e5e8c4d0`` + + :gl:`#5838` :gl:`!11803` + +- Fix CPU spikes and slow queries when cache approaches memory limit. + ``874a19c71b`` + + When the cache grew close to the configured max-cache-size, every + subsequent entry triggered all worker threads to run cache cleanup at + once, causing CPU spikes and a drop in query throughput. Cleanup is + now spread probabilistically across inserts as memory approaches the + limit, so the work is distributed evenly instead of piling up at the + threshold. + +Bug Fixes +~~~~~~~~~ + +- Fix named crash when processing SIG records in dynamic updates. + ``df77c239ac`` + + Previously, :iscman:`named` could abort if a client sent a dynamic + update containing a SIG record (the legacy signature type) to a zone + configured with an update-policy. The function `dns_db_findrdataset` + had an incorrect requirements prerequisite that prevented SIG records + being looked up, which was triggered as part of processing an UPDATE + request and could be triggered remotely by any client permitted to + send updates. This has been fixed by ensuring that SIG records are + handled consistently with RRSIG records during update processing. + :gl:`#5818` :gl:`!11877` + +- Fix zone verification of NSEC3 signed zones. ``3a2e16ae65`` + + Previously, when computing the compressed bitmap during verification + of an NSEC3-signed zone, an undersized buffer was used that resulted + in an out-of-bounds write if there were too many active windows in the + bitmap. This impacted mirror zones which are NSEC3-signed, + `dnssec-signzone` and `dnssec-verifyzone`. This has been fixed. + :gl:`#5834` :gl:`!11834` + +- Prevent a crash when using both dns64 and filter-aaaa. ``891d055efc`` + + An assertion failure could be triggered if both `dns64` and the + `filter-aaaa` plugin were in use simultaneously. This happened if the + plugin triggered a second recursion process, which then attempted to + store DNS64 state information in a pointer that had already been set + by the original recursion process. This has been fixed. :gl:`#5854` + :gl:`!11968` + +- Remove unnecessary dns_name_free call. ``46aa4fd08d`` + + When processing a catalog zone member's primaries definition and there + is a TXT record containing an invalid name TSIG key name, + dns_name_free was incorrectly called triggering an assertion. This has + been fixed. :gl:`#5858` :gl:`!11849` + +- Tidy up the cleanup path in check_signer() ``03af408476`` + + When check_signer() processed a DNSKEY whose public-key data could not + be parsed, the early return on the parse error skipped the cleanup of + the cloned signature rdataset. In every code path that currently + reaches this function the cloned rdataset holds no resources, so no + memory was actually leaked, but the cleanup is restructured so the + parse and the iteration cannot diverge again. :gl:`#5869` :gl:`!11960` + +- Prevent malicious DNSSEC zones from exhausting validator CPU. + ``784725ef85`` + + A DNSSEC-signed zone could publish a DNSKEY with an unusually large + RSA public exponent and force any validator resolving names in that + zone to spend disproportionate CPU verifying signatures. The + validator now rejects such DNSKEYs, matching the limit already applied + to keys read from files or HSMs. :gl:`#5881` :gl:`!11924` + +- Fix inverted gethostname() check in rndc status. ``c874e39a23`` + + The replacement of named_os_gethostname() with raw gethostname() + inverted the success check: the "localhost" fallback runs on success, + and on failure the uninitialized hostname buffer is read by + snprintf(), leaking stack memory via the rndc status reply. + :gl:`#5889` :gl:`!11883` + +- Fix rndc-confgen aborting on HMAC-SHA-384/512 keys above 512 bits. + ``739e79592d`` + + `rndc-confgen -A hmac-sha384` and `-A hmac-sha512` documented a `-b` + range of 1..1024, but any value above 512 aborted on hardened builds + instead of producing a key. The full advertised range now works. + :gl:`#5903` :gl:`!11911` + +- Prevent crafted queries from degrading RRL performance. ``e81855244d`` + + With response rate limiting enabled, an attacker sending queries from + many spoofed source addresses could steer entries into the same slot + of the internal rate-limit table and slow down query processing on the + affected server. The table now uses a per-process keyed hash so the + placement of entries cannot be predicted or influenced from the + network. :gl:`#5906` :gl:`!11953` + +- Fix swapped arguments in redirect2() single-label branch. + ``9a969bf1bc`` + + On a recursive resolver with nxdomain-redirect configured, an NXDOMAIN + result for a query whose qname is the root could corrupt the view's + nxdomain-redirect target, after which the redirect feature stopped + working for every subsequent query in that view until named was + restarted. :gl:`#5908` :gl:`!11914` + +- Fix a bug in allow-query/allow-transfer catalog zone custom + properties. ``9e5a52e6fa`` + + The :iscman:`named` process could terminate unexpectedly when + processing a catalog zone with an invalid ``allow-query`` or + ``allow-transfer`` custom property (i.e. having a non-APL type) + coexisting with the valid property. This has been fixed. :gl:`#5941` + :gl:`!11976` + +- Fix a memory leak issue in the catalog zones. ``0b5874d3e1`` + + The :iscman:`named` process could leak small amounts of memory when + processing a catalog zone entry which had defined custom primary + servers with TSIG keys using both the regular ``primaries`` custom + property syntax and the legacy alternative syntax (``masters``) at the + same time. This has been fixed. :gl:`#5943` :gl:`!11974` + +- Fix suppressed missing-glue check in named-checkzone. ``598277fe03`` + + named-checkzone and named-checkconf -z silently skipped the + missing-glue check for any NS name that had already triggered an + extra-AAAA-glue warning, so zones missing required A glue could pass + validation and be deployed with broken delegations. :gl:`!11906` + +- Pass empty string instead of NULL to ns_client_dumpmessage() + ``d489d825dc`` + + Pass "" instead of NULL to ns_client_dumpmessage() to get the log + message printed. + +- Reject record sets too large to serve in DNS. ``ab3d96b3e3`` + + When BIND was asked to store a record set whose total size exceeds + what fits in a DNS message, it would allocate memory and build the + structure, then fail later at response time. Such oversized record + sets are now rejected at the time of storage with an error, avoiding + wasted work on data that can never be served. :gl:`!11965` + + diff --git a/doc/notes/notes-9.18.49.rst b/doc/notes/notes-9.18.49.rst new file mode 100644 index 0000000000..3bd35d7bff --- /dev/null +++ b/doc/notes/notes-9.18.49.rst @@ -0,0 +1,192 @@ +.. 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 9.18.49 +---------------------- + +Security Fixes +~~~~~~~~~~~~~~ + +- Limit resolver server list size. :cve:`2026-3592` + + When resolving a domain with many nameservers that shared overlapping + IP addresses (e.g., 10 NS records all pointing at the same set of + addresses), BIND could previously waste time querying duplicate + addresses and build up excessively large server lists. Addresses in + the resolver's server list are now deduplicated so that each unique IP is only + queried once per resolution attempt, regardless of how many NS records + point to it. The number of addresses stored per nameserver name + is also now capped at six (combined A and AAAA), preventing memory and CPU overhead from + domains with unusually large NS/glue sets. + + ISC would like to thank Shuhan Zhang from Tsinghua University for + reporting this issue. :gl:`#5641` + +- Fix GSS-API resource leak. :cve:`2026-3039` + + A memory leak was fixed where each GSS-API TKEY negotiation leaked a + security context inside the GSS library. An unauthenticated attacker + could exhaust server memory by sending repeated TKEY queries to a + server with :any:`tkey-gssapi-keytab` configured. The leaked memory was + allocated by the GSS library, bypassing BIND's memory accounting. + + Multi-round GSS-API negotiation (GSS_S_CONTINUE_NEEDED) is now + rejected, as BIND never supported it correctly and Kerberos/SPNEGO + completes in a single round. + + ISC would like to thank Vitaly Simonovich for bringing this + vulnerability to our attention. :gl:`#5752` + +- Disable recursion, UPDATE, and NOTIFY for non-IN views. + :cve:`2026-5946` + + Recursion, dynamic updates (UPDATE), and zone change notifications + (NOTIFY) are now disabled for views with a class other than IN (such + as CHAOS or HESIOD); authoritative service for non-IN zones (e.g. + version.bind in class CHAOS) continues to work as before. Servers + configured with :namedconf:ref:`recursion yes; ` + in a non-IN view log a warning at + startup, and :iscman:`named-checkconf` flags the same condition. UPDATE and + NOTIFY messages that specify the meta-classes ANY or NONE in the + question section are now rejected with FORMERR. + + This addresses a set of closely related security issues collectively + identified as CVE-2026-5946. ISC would like to thank Mcsky23 for + bringing these issues to our attention. :gl:`#5784` + +- Avoid unbounded recursion loop. :cve:`2026-5950` + + A bug during bad server handling could cause the resolver to enter an + infinite loop, continuously sending queries to an upstream server with + no exit condition, until the resolver query timeout was hit. This has + been fixed. + + ISC would like to thank Billy Baraja (BielraX) for bringing this issue + to our attention. :gl:`#5804` + +- Fix outgoing zone transfers' quota issue. + + Unauthorized clients could consume the entire outgoing zone-transfer quota and + block authorized zone transfer clients. This has been fixed. + :gl:`#3589` + +Feature Changes +~~~~~~~~~~~~~~~ + +- Fix CPU spikes and slow queries when cache approaches memory limit. + + Cache cleanup is now spread probabilistically to avoid CPU usage spikes and a + drop in query throughput. :gl:`#5891` + +Bug Fixes +~~~~~~~~~ + +- Fix :iscman:`named` crash when processing SIG records in dynamic updates. + + Previously, :iscman:`named` could abort if a client sent a dynamic + update containing a SIG record (the legacy signature type) to a zone + configured with an update-policy. The function `dns_db_findrdataset` + had an incorrect requirements prerequisite that prevented SIG records + from being looked up, which was triggered as part of processing an UPDATE + request and could be triggered remotely by any client permitted to + send updates. This has been fixed by ensuring that SIG records are + handled consistently with RRSIG records during update processing. + :gl:`#5818` + +- Fix :option:`rndc modzone` behavior for a zone in named.conf. + + If a zone was present in the configuration file and not originally + added by :option:`rndc addzone`, :option:`rndc modzone` for that zone would succeed + once but subsequent :option:`rndc modzone` attempts would fail. This has been + fixed. :gl:`#5826` + +- Fix zone verification of NSEC3 signed zones. + + Previously, when computing the compressed bitmap during verification + of an NSEC3-signed zone, an undersized buffer was used that resulted + in an out-of-bounds write if there were too many active windows in the + bitmap. This impacted the mirror zones which are NSEC3-signed, + :iscman:`dnssec-signzone` and :iscman:`dnssec-verify`. This has been fixed. + :gl:`#5834` + +- Prevent a crash when using both :any:`dns64` and :any:`filter-aaaa`. + + An assertion failure could be triggered if both :any:`dns64` and the + :any:`filter-aaaa` plugin were in use simultaneously. This happened if the + plugin triggered a second recursion process, which then attempted to + store DNS64 state information in a pointer that had already been set + by the original recursion process. This has been fixed. :gl:`#5854` + +- Fixed an assertion failure when processing catalog zones. + + If a TXT record containing an invalid name TSIG key name was found + when processing a catalog zone member's primaries definition, + ``dns_name_free`` was incorrectly called, triggering an assertion. This has + been fixed. :gl:`#5858` + +- Prevent malicious DNSSEC zones from exhausting validator CPU. + + A DNSSEC-signed zone could publish a DNSKEY with an unusually large + RSA public exponent and force any validator resolving names in that + zone to spend disproportionate CPU verifying signatures. The + validator now rejects such DNSKEYs, matching the limit already applied + to keys read from files or HSMs. :gl:`#5881` + +- Fix :iscman:`rndc-confgen` aborting on HMAC-SHA-384/512 keys above 512 bits. + + :iscman:`rndc-confgen` (with either ``-A hmac-sha384`` or + ``-A hmac-sha512``) previously documented a ``-b`` + range of 1..1024, but any value above 512 aborted on hardened builds + instead of producing a key. The full advertised range now works. + :gl:`#5903` + +- Prevent crafted queries from degrading RRL performance. + + With response rate limiting enabled, an attacker sending queries from + many spoofed source addresses could steer entries into the same slot + of the internal rate-limit table and slow down query processing on the + affected server. The table now uses a per-process keyed hash so the + placement of entries cannot be predicted or influenced from the + network. :gl:`#5906` + +- Fix a bug in :any:`allow-query`/:any:`allow-transfer` catalog zone custom + properties. + + The :iscman:`named` process could terminate unexpectedly when + processing a catalog zone with an invalid :any:`allow-query` or + :any:`allow-transfer` custom property (i.e. having a non-APL type) + coexisting with the valid property. This has been fixed. :gl:`#5941` + +- Fix a memory leak issue in catalog zones. + + The :iscman:`named` process could leak small amounts of memory when + processing a catalog zone entry which had defined custom primary + servers with TSIG keys, if both the regular ``primaries`` custom + property syntax and the legacy alternative syntax (``masters``) were used at the + same time. This has been fixed. :gl:`#5943` + +- Fix suppressed missing-glue check in :iscman:`named-checkzone`. + + :iscman:`named-checkzone` and :option:`named-checkconf -z` silently + skipped the missing-glue check for any NS name that had already + triggered an extra-AAAA-glue warning, so zones missing required A glue + could pass validation and be deployed with broken delegations. + :gl:`!11899` + +- Reject record sets too large to serve in DNS. + + When BIND was asked to store a record set whose total size exceeded + what fit in a DNS message, it would allocate memory and build the + structure, then fail later at response time. Such oversized record + sets are now rejected at the time of storage with an error, avoiding + wasted work on data that can never be served. :gl:`!11963` + +