github NLnetLabs/unbound release-1.21.0
Unbound 1.21.0

latest releases: release-1.22.0, release-1.22.0rc1, release-1.21.1...
2 months ago

Unbound 1.21.0

This release has a fix for the CAMP and CacheFlush issues. They have a
low severity for Unbound, since it does not affect Unbound so much.

The Compositional Amplification (CAMP) type of attacks can lead to DoS
attacks against DNS servers. In Unbound legitimate client requests to
the resolvers under typical workload are not directly affected by CAMP
attacks. However we introduce a global quota for 128 outgoing packets
per query (and it's subqueries) that is never reset to prevent the
combination of CAMP with other amplification attacks in the future. We
would like to thank Huayi Duan, Marco Bearzi, Jodok Vieli, and Cagin
Tanir from NetSec group, ETH Zurich for discovering and notifying us
about the issue.

The CacheFlush type of attacks (NSCacheFlush, CNAMECacheFlush) try to
evict cached data by utilizing rogue zones and a steady rogue stream to
a resolver. Based on the zone, the stream, the configured cache size
and the legitimate traffic, Unbound could experience a degradation of
service if a useful entry is evicted and Unbound needs to resolve again.
As a mitigation to the NSCacheFlush attack Unbound is setting a limit
of 20 RRs in an NS RRset. We would like to thank Yehuda Afek, Anat
Bremler-Barr, Shoham Danino and Yuval Shavitt (Tel-Aviv University and
Reichman University) for discovering and notifying us about the issue.

Other fixes in this release are bug fixes. Also the unbound control
commands that flush the cache can clear both the memory and cachedb
module cache. The ipset module can use BSD pf tables. The new option
dnstap-sample-rate: 100 can be used to log 1/N messages, for use in
high volume server environments where the log server does not keep up.

The new DNSSEC key for the root, 38696 from 2024 has been added. It is
added to the default root keys in unbound-anchor. The content can be
inspected with unbound-anchor -l. Older versions of Unbound can keep
up with the root key with auto-trust-anchor-file that has RFC5011
key rollover. Also unbound-anchor can fetch the keys from the website
with a certificate if needed.

For cookie secrets, it is possible to perform rollover. The file
with cookie secret in use and the staging secret is configured
with cookie-secret-file. With the remote control the rollover can be
performed, add_cookie_secret, activate_cookie_secret, drop_cookie_secret
and print_cookie_secrets can be used for that.

Compared to the RC1, the release has a fix for module loading on Windows,
and a spelling correction.

Features

  • Fix #1071: [FR] Clear both in-memory and cachedb module cache with
    unbound-control flush* commands.
  • Fix #144: Port ipset to BSD pf tables.
  • Add dnstap-sample-rate that logs only 1/N messages, for high volume
    server environments. Thanks Dan Luther.
  • Add root key 38696 from 2024 for DNSSEC validation. It is added
    to the default root keys in unbound-anchor. The content can be
    inspected with unbound-anchor -l.
  • Merge #1090: Cookie secret file. Adds
    cookie-secret-file: "unbound_cookiesecrets.txt" option to store
    cookie secrets for EDNS COOKIE secret rollover. The remote control
    add_cookie_secret, activate_cookie_secret and drop_cookie_secret
    commands can be used for rollover, the command print_cookie_secrets
    shows the values in use.

Bug Fixes

  • Fix CAMP issues with global quota. Thanks to Huayi Duan, Marco
    Bearzi, Jodok Vieli, and Cagin Tanir from NetSec group, ETH Zurich.
  • Fix CacheFlush issues with limit on NS RRs. Thanks to Yehuda Afek,
    Anat Bremler-Barr, Shoham Danino and Yuval Shavitt (Tel-Aviv
    University and Reichman University).
  • Merge #1062: Fix potential overflow bug while parsing port in
    function cfg_mark_ports.
  • Fix for #1062: declaration before statement, avoid print of null,
    and redundant check for array size.
  • Fix to squelch udp connect errors in the log at low verbosity about
    invalid argument for IPv6 link local addresses.
  • Fix when the mesh jostle is exceeded that nameserver targets are
    marked as resolved, so that the lookup is not stuck on the
    requestlist.
  • Add missing common functions to tdir tests.
  • Merge #1070: Fix rtt assignement for low values of
    infra-cache-max-rtt.
  • Merge #1069: Fix unbound-control stdin commands for multi-process
    Unbounds.
  • Fix unbound-control commands that read stdin in multi-process
    operation (local_zones_remove, local_zones, local_datas_remove,
    local_datas, view_local_datas_remove, view_local_datas). They will
    be properly distributed to all processes. dump_cache and load_cache
    are no longer supported in multi-process operation.
  • Remove testdata/remote-threaded.tdir. testdata/09-unbound-control.tdir
    now checks both single and multi process/thread operation.
  • Merge #1073: fix null pointer dereference issue in function
    ub_ctx_set_fwd.
  • Fix to print a parse error when config is read with no name for
    a forward-zone, stub-zone or view.
  • Fix for parse end of forward-zone, stub-zone and view.
  • Fix for #1064: Fix that cachedb expired messages are considered
    insecure, and thus can be served to clients when dnssec is enabled.
  • Fix #1059: Intermittent DNS blocking failure with local-zone and
    always_nxdomain. Addition of local_zones dynamically via
    unbound-control was not finding the zone's parent correctly.
  • Fix #1064: Unbound 1.20 Cachedb broken?
  • Fix unused variable warning on compilation with no thread support.
  • unbound-control-setup: check openssl availability before doing
    anything, patch from Michael Tokarev.
  • Update patch to remove 'command' shell builtin and update error
    text.
  • Fix to enable that SERVFAIL is cached, for a short period, for more
    cases. In the cases where limits are exceeded.
  • Fix spelling of tcp-idle-timeout docs, from Michael Tokarev.
  • Merge #1078: Only check old pid if no username.
  • Fix #1079: tags from tagged rpz zones are no longer honored after
    upgrade from 1.19.3 to 1.20.0.
  • Fix for #1079: fix RPZ taglist in iterator callback that no client
    info is like no taglist intersection.
  • Fix to squelch connection reset by peer errors from log. And fix
    that the tcp read errors are labeled as initial for the first calls.
  • Merge #1080: AddressSanitizer detection in tdir tests and memory leak
    fixes.
  • Fix memory leak when reload_keep_cache is used and num-threads
    changes.
  • Fix memory leak on exit for unbound-dnstap-socket; creates false
    negatives during testing.
  • Fix memory leak in setup of dsa sig.
  • Fix typos for 'the the' in text.
  • Fix validation for repeated use of a DNAME record.
  • Add unit test for validation of repeated use of a DNAME record.
  • Fix #1091: Build fails with OpenSSL >= 3.0 built with
    OPENSSL_NO_DEPRECATED.
  • Fix #1092: Ubuntu 22.04 Jammy fails to compile unbound 1.20.0; by
    adding helpful text for the Python interpreter version and allowing
    the default pkg-config unavailability error message to be shown.
  • Fix pkg-config availability check in dnstap/dnstap.m4 and
    systemd.m4.
  • Explicitly set the RD bit for the mesh query flags when prefetching.
    These queries have no waiting client but they need to be treated as
    recursive.
  • Fix ip-ratelimit-cookie setting, it was not applied.
  • Fix to remove unused include from the readzone test program.
  • Fix unused variable warning in do_cache_remove.
  • Fix compile warning in worker pthread id printout.
  • Add unit test skip files and bison and flex output to gitignore.
  • Fix to use modstack_init in zonemd unit test.
  • Fix to remove unneeded linebreak in fptr_wlist.c.
  • Fix compile warnings in fptr_wlist.c.
  • Fix for repeated use of a DNAME record: first overallocate and then
    move the exact size of the init value to avoid false positive heap
    overflow reads from address sanitizers.
  • Fix to print details about the failure to lookup a DNSKEY record
    when validation fails due to the missing DNSKEY. Also for key prime
    and DS lookups.
  • Fix for neater printout for error for missing DS response.
  • Fix neater printout.
  • Fix #1099: Unbound core dump on SIGSEGV.
  • Fix for #1099: Fix to check for deleted RRset when the contents
    is updated and fetched after it is stored, and also check for a
    changed RRset.
  • Don't check for message TTL changes if the RRsets remain the same.
  • Fix that validation reason failure that uses string print uses
    separate buffer that is passed, from the scratch validation buffer.
  • Fixup algo_needs_reason string buffer length.
  • Fix shadowed error string variable in validator dnskey handling.
  • Update list of known EDE codes.
  • For #773: In contrib/unbound.service.in set unbound to start after
    network-online.target. Also for contrib/unbound_portable.service.in.
  • Fix #1103: unbound 1.20.0 segmentation fault with nghttp2.
  • For #1103: fix to also drop mesh state reference when a h2 reply is
    dropped.
  • Add RPZ tag tests in acl_interface.tdir.
  • For #1102: clearer text for using interface-* options for the
    loopback interface.
  • For #1103: fix to also drop mesh state reference when the discard
    limit is reached, when there is an error making a new recursion
    state and when the connection is dropped with is_drop.
  • For #1103: Fix to drop mesh state reference for the http2 stream
    associated with the reply, not the currently active stream. And
    it does not remove it twice on a mesh_send_reply call. The reply
    h2_stream is NULL when not in use, for more initialisation.
  • Fix dnstap wakeup, a running wakeup timer is left to expire and not
    increased, a timer is started when the dtio thread is sleeping,
    the timer set disabled when the dtio thread goes to sleep, and
    after sleep the thread checks to see if there are messages to log
    immediately.
  • Merge #1110: Make fallthrough explicit for libworker.c.
  • For #1110: Test for fallthrough attribute in configure and add
    fallthrough attribute annotations.
  • Fix compile when the compiler does not support the noreturn
    attribute.
  • Fix to have empty definition when not supported for weak attribute.
  • Fix uninitialized variable warning in create_tcp_accept_sock.
  • Fix link of dnstap without openssl.
  • Fix link of unbound-dnstap-socket without openssl.
  • Fix #1106: ratelimit-below-domain logs the wrong FROM address.
  • Cleanup ede.tdir test.
  • For #935 and #1104, clarify RPZ order and semantics.
  • Fix to document parameters of auth_zone_verify_zonemd_with_key.
  • Fix for #1114: Fix that cache fill for forward-host names is
    performed, so that with nonzero target-fetch-policy it fetches
    forwarder addresses and uses them from cache. Also updated that
    delegation point cache fill routines use CDflag for AAAA message
    lookups, so that its negative lookup stops a recursion since the
    cache uses the bit for disambiguation for dns64 but the recursion
    uses CDflag for the AAAA target lookups, so the check correctly
    stops a useless recursion by its cache lookup.
  • Fix dnstap test program, cleans up to have clean memory on exit,
    for tap_data_free, does not delete NULL items. Also it does not try
    to free the tail, specifically in the free of the list since that
    picked up the next item in the list for its loop causing invalid
    free. Added internal unit test to unbound-dnstap-socket for that.
  • Fix that the worker mem report with alloc stats does not attempt
    to print memory use of forwards and hints if they have been
    deleted already.
  • Fix that alloc stats has strdup checks, it stops debuggers from
    complaining about mismatch at free time.
  • Fix testbound for alloc stats strdup in util/alloc.c.
  • Fix that alloc stats for forwards and hints are printed, and when
    alloc stats is enabled, the unit test for unbound control waits for
    reloads to complete.
  • Fix that for windows the module startup is called and sets up
    the module-config.
  • Fix spelling for the cache-min-negative-ttl entry in the
    example.conf.

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