#20238 closed enhancement (fixed)
unbound-1.21.0
| Reported by: | Bruce Dubbs | Owned by: | Bruce Dubbs |
|---|---|---|---|
| Priority: | elevated | Milestone: | 12.2 |
| Component: | BOOK | Version: | git |
| Severity: | normal | Keywords: | |
| Cc: |
Description ¶
New minor version.
Change History (5)
comment:1 by , 8 months ago
| Owner: | changed from to |
|---|---|
| Status: | new → assigned |
comment:2 by , 8 months ago
comment:3 by , 8 months ago
| Resolution: | → fixed |
|---|---|
| Status: | assigned → closed |
Fixed at commits
b0ff7d03f3 Update to gnutls-3.8.7.1. 61c7e618c6 Update to btrfs-progs-6.10.1. 5ac862b215 Update to unbound-1.21.0.
comment:4 by , 8 months ago
| Priority: | normal → elevated |
|---|
This version has multiple security fixes regarding CacheFlush.
https://lists.nlnetlabs.nl/pipermail/unbound-users/2024-August/008377.html announces the release of version 1.21.0 of this DNS server, including: > 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. This appears to refer to: https://www.usenix.org/conference/usenixsecurity24/presentation/duan > 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. This appears to refer to: https://www.usenix.org/conference/usenixsecurity24/presentation/afek > - Fix #1071: [FR] Clear both in-memory and cachedb module cache with > `unbound-control flush*` commands. This appears to have been assigned CVE-2024-43167: https://www.cve.org/CVERecord?id=CVE-2024-43167
These papers are really interesting! https://www.usenix.org/system/files/usenixsecurity24-duan.pdf and https://www.usenix.org/system/files/usenixsecurity24-afek.pdf
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9 August 2024: Wouter - Fix spelling for the cache-min-negative-ttl entry in the example.conf. 8 August 2024: Wouter - 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). - Set version number to 1.21.0 for release. - Fix that for windows the module startup is called and sets up the module-config. 2 August 2024: Wouter - 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. - 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. - 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. 1 August 2024: Wouter - 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. 31 July 2024: Wouter - 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. 30 July 2024: Wouter - Fix to document parameters of auth_zone_verify_zonemd_with_key. 25 July 2024: Wouter - 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`. 23 July 2024: Yorgos - Fix #1106: ratelimit-below-domain logs the wrong FROM address. - Cleanup ede.tdir test. - For #935 and #1104, clarify RPZ order and semantics. 23 July 2024: Wouter - 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. 19 July 2024: Wouter - Add dnstap-sample-rate that logs only 1/N messages, for high volume server environments. Thanks Dan Luther. - 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. 16 July 2024: Wouter - 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. 15 July 2024: Wouter - 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. 12 July 2024: Yorgos - Add RPZ tag tests in acl_interface.tdir. - For #1102: clearer text for using interface-* options for the loopback interface. 12 July 2024: Wouter - 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. 10 July 2024: Wouter - For #773: In contrib/unbound.service.in set unbound to start after network-online.target. Also for contrib/unbound_portable.service.in. 9 July 2024: Yorgos - Update list of known EDE codes. 8 July 2024: Wouter - 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. 5 July 2024: Yorgos - Don't check for message TTL changes if the RRsets remain the same. 5 July 2024: Wouter - 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. 4 July 2024: Wouter - 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. 3 July 2024: Yorgos - 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. 3 July 2024: Wouter - Fix #144: Port ipset to BSD pf tables. - 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. 2 July 2024: Wouter - 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. 17 June 2024: Wouter - Fix ip-ratelimit-cookie setting, it was not applied. 26 June 2024: Yorgos - 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. 21 June 2024: Yorgos - Fix pkg-config availability check in dnstap/dnstap.m4 and systemd.m4. 19 June 2024: Yorgos - 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. 17 June 2024: Wouter - Fix #1091: Build fails with OpenSSL >= 3.0 built with OPENSSL_NO_DEPRECATED. 7 June 2024: Wouter - Add unit test for validation of repeated use of a DNAME record. 6 June 2024: Wouter - Fix memory leak in setup of dsa sig. - Fix typos for 'the the' in text. - Fix validation for repeated use of a DNAME record. 4 June 2024: Yorgos - 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. 3 June 2024: Wouter - 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. 30 May 2024: Wouter - 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. 29 May 2024: Wouter - Merge #1078: Only check old pid if no username. 27 May 2024: Wouter - 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. 27 May 2024: Yorgos - 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. 24 May 2024: Wouter - Fix #1064: Unbound 1.20 Cachedb broken? 24 May 2024: Yorgos - 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. 21 May 2024: Wouter - 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. 17 May 2024: Yorgos - 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. 16 May 2024: Yorgos - Merge #1070: Fix rtt assignement for low values of infra-cache-max-rtt. 16 May 2024: Wouter - Fix #1071: [FR] Clear both in-memory and cachedb module cache with `unbound-control flush*` commands. 15 May 2024: Yorgos - Add missing common functions to tdir tests. 10 May 2024: Wouter - Fix when the mesh jostle is exceeded that nameserver targets are marked as resolved, so that the lookup is not stuck on the requestlist. 8 May 2024: Wouter - Fix to squelch udp connect errors in the log at low verbosity about invalid argument for IPv6 link local addresses. 7 May 2024: Wouter - 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.