nsd-checkzone in NLnet Labs NSD 4.2.0 has a Stack-based Buffer Overflow in the dname_concatenate() function in dname.c.

This update for nsd fixes the following issues :

nsd was updated to the new upstream release 4.3.4

FEATURES :

  - Merge PR #141: ZONEMD RR type.

BUG FIXES :

  - Fix that symlink does not interfere with chown of     pidfile (boo#1179191, CVE-2020-28935)

  - Fix #128: Fix that the invalid port number is logged for     sendmmsg failed: Invalid argument.

  - Fix #133: fix 0-init of local ( stack ) buffer.

  - Fix #134: IPV4_MINIMAL_RESPONSE_SIZE vs     EDNS_MAX_MESSAGE_LEN.

  - Fix to add missing closest encloser NSEC3 for wildcard     nodata type DS answer.

  - Fix #138: NSD returns non-EDNS answer when QUESTION is     empty.

  - Fix #142: NODATA answers missin SOA in authority section     after CNAME chain.

New upstream release 4.3.3 :

FEATURES :

  - Follow DNS flag day 2020 advice and set default EDNS     message size to 1232.

  - Merged PR #113 with fixes. Instead of listing an     IP-address to listen on, an interface name can be     specified in nsd.conf, with ip-address: eth0. The     IP-addresses for that interface are then used.

  - New upstream release 4.3.2

FEATURES :

  - Fix #96: log-only-syslog: yes sets to only use syslog,     fixes that the default configuration and systemd results     in duplicate log messages.

  - Fix #107: nsd -v shows configure line, openssl version     and libevent version.

  - Fix #103 with #110: min-expire-time option. To provide a     lower bound for expire period. Expressed in number of     seconds or refresh+retry+1.

BUG FIXES :

  - Fix to omit the listen-on lines from log at startup,     unless verbose.

  - Fix #97: EDNS unknown version: query not in response.

  - Fix #99: Fix copying of socket properties with reuseport     enabled.

  - Document default value for tcp-timeout.

  - Merge PR#102 from and0x000: add missing default in     documentation for drop-updates.

  - Fix unlink of pidfile warning if not possible due to     permissions, nsd can display the message at high     verbosity levels.

  - Removed contrib/nsd.service, example is too complicated     and not useful.

  - Merge #108 from Nomis: Make the max-retry-time     description clearer.

  - Retry when udp send buffer is full to wait until buffer     space is available.

  - Remove errno reset behaviour from sendmmsg and recvmmsg     replacement functions.

  - Fix unit test for different nsd-control-setup -h exit     code.

  - Merge #112 from jaredmauch: log old and new serials when     NSD rejects an IXFR due to an old serial number.

  - Fix #106: Adhere better to xfrd bounds. Refresh and     retry times.

  - Fix #105: Clearing hash_tree means just emptying the     tree.

New upstream release 4.3.1

BUG FIXES :

  - Merge PR #91 by gearnode: nsd-control-setup recreate     certificates. The '-r' option recreates certificates.
    Without it it creates them if they do not exist, and     does not modify them otherwise.

New upstream release 4.3.0

FEATURES :

  - Fix to use getrandom() for randomness, if available.

  - Fix #56: Drop sparse TSIG signing support in NSD. Sign     every axfr packet with TSIG, according to the latest     draft-ietf-dnsop-rfc2845bis-06, Section 5.3.1.

  - Merge pull request #59 from buddyns: add FreeBSD support     for conf key ip-transparent.

  - Add feature to pin server processes to specific cpus.

  - Add feature to pin IP addresses to selected server     processes.

  - Set process title to identify individual processes.

  - Merge PR#22: minimise-any: prefer polular and not large     RRset, from Daisuke Higashi.

  - Add support for SO_BINDTODEVICE on Linux.

  - Add feature to drop queries with opcode UPDATE.

BUG FIXES :

  - Fix whitespace in nsd.conf.sample.in, patch from Paul     Wouters.

  - use-systemd is ignored in nsd.conf, when NSD is compiled     with libsystemd it always signals readiness, if     possible.

  - Note that use-systemd is not necessary and ignored in     man page.

  - Fix responses for IXFR so that the authority section is     not echoed in the response.

  - Fix that the retry wait does not exceed one day for zone     transfers.

  - Update keyring as per https://nlnetlabs.nl/people/

New upstream release 4.2.3 :

  - confine-to-zone configures NSD to not return out-of-zone     additional information.

  - pidfile '' allows to run NSD without a pidfile

  - adds support for readiness notification with READY_FD

  - fix excessive logging of ixfr failures, it stops the log     when fallback to axfr is possible. log is enabled at     high verbosity.

  - The nsd.conf includes are sorted ascending, for include     statements with a '*' from glob.

  - Fix log address and failure reason with tls handshake     errors, squelches (the same as unbound) some unless high     verbosity is used.

  - Number of different UDP handlers has been reduced to     one. recvmmsg and sendmmsg implementations are now used     on all platforms.

  - Socket options are now set in designated functions for     easy reuse.

  - Socket setup has been simplified for easy reuse.

  - Configuration parser is now aware of the context in     which an option was specified.

  - document that remote-control is a top-level nsd.conf     attribute.

  - Remove legacy upgrade of nsd users in %post     (boo#1157331)

New upstream release 4.2.2 :

  - Fix #20: CVE-2019-13207 Stack-based Buffer Overflow in     the dname_concatenate() function. Reported by Frederic     Cambus. It causes the zone parser to crash on a     malformed zone file, with assertions enabled, an     assertion catches it.

  - Fix #19: Out-of-bounds read caused by improper     validation of array index. Reported by Frederic Cambus.
    The zone parser fails on type SIG because of mismatched     definition with RRSIG.

  - PR #23: Fix typo in nsd.conf man-page.

  - Fix that NSD warns for wrong length of the hash in SSHFP     records.

  - Fix #25: NSD doesn't refresh zones after extended     downtime, it refreshes the old zones.

  - Set no renegotiation on the SSL context to stop client     session renegotiation.

  - Fix #29: SSHFP check NULL pointer dereference.

  - Fix #30: SSHFP check failure due to missing domain name.

  - Fix to timeval_add in minievent for remaining second in     microseconds.

  - PR #31: nsd-control: Add missing stdio header.

  - PR #32: tsig: Fix compilation without HAVE_SSL.

  - Cleanup tls context on xfrd exit.

  - Fix #33: Fix segfault in service of remaining streams on     exit.

  - Fix error message for out of zone data to have more     information.

New upstream release 4.2.1 :

  - FEATURES :

  - Added num.tls and num.tls6 stat counters.

  - PR #12: send-buffer-size, receive-buffer-size,     tcp-reject-overflow options for nsd.conf, from Jeroen     Koekkoek.

  - Fix #14, tcp connections have 1/10 to be active and have     to work every second, and then they get time to complete     during a reload, this is a process that lingers with the     old version during a version update.

  - BUG FIXES :

  - Fix #13: Stray dot at the end of some log entries,     removes dot after updated serial number in log entry.

  - Fix TLS cipher selection, the previous was redundant,     prefers CHACHA20-POLY1305 over AESGCM and was not as     readable as it could be.

  - Fix #15: crash in SSL library, initialize variables for     TCP access when TLS is configured.

  - Fix tls handshake event callback function mistake,     reported by Mykhailo Danylenko.

  - Fix output of nsd-checkconf -h.

New upstream release 4.2.0 :

  - Implement TCP fast open

  - Added DNS over TLS

  - TLS OCSP stapling support with the tls-service-ocsp     option

  - New option hide-identity can be used in nsd.conf to stop     NSD from responding with the hostname for probe queries     that elicit the chaos class response, this is conform     RFC4892

  - Disable TLS1.0, TLS1.1 and weak ciphers, enable     CIPHER_SERVER_PREFERENCE

Update to upstream release 4.1.27 :

  - FEATURES :

  - Deny ANY with only one RR in response, by default. Patch     from Daisuke Higashi. The deny-any statement in nsd.conf     sets ANY queries over UDP to be further moved to TCP as     well. Also no additional section processig for type ANY,     reducing the response size.

  - Fix #4215: on-the-fly change of TSIG keys with patch     from Igor, adds nsd-control print_tsig, update_tsig,     add_tsig, assoc_tsig and del_tsig. These changes are     gone after reload, edit the config file (or a file     included from it) to make changes that last after     restart.

  - BUG FIXES :

Update to upstream release 4.1.26 :

  - FEATURES :

  - DNSTAP support for NSD, --enable-dnstap and then config     in nsd.conf.

  - Support SO_REUSEPORT_LB in FreeBSD 12 with the     reuseport: yes option in nsd.conf.

  - Added nsd-control changezone. nsd-control changezone     name pattern allows the change of a zone pattern option     without downtime for the zone, in one operation.

  - BUG FIXES :

  - Fix #4194: Zone file parser derailed by non-FQDN names     in RHS of DNSSEC RRs.

  - Fix #4202: nsd-control delzone incorrect exit code on     error.

  - Fix to not set GLOB_NOSORT so the nsd.conf include:
    files are sorted and in a predictable order.

  - Fix #3433: document that reconfig does not change     per-zone stats.

Update to upstream release 4.1.25 :

  - FEATURES :

  - nsd-control prints neater errors for file failures.

  - BUG FIXES :

  - Fix that nsec3 precompile deletion happens before the     RRs of the zone are deleted.

  - Fix printout of accepted remote control connection for     unix sockets.

  - Fix use_systemd typo/leftover in remote.c.

  - Fix codingstyle in nsd-checkconf.c in patch from Sharp     Liu.

  - append_trailing_slash has one implementation and is not     repeated differently.

  - Fix coding style in nsd.c

  - Fix to combine the same error function into one, from     Xiaobo Liu.

  - Fix initialisation in remote.c.

  - please clang analyzer and fix parse of IPSECKEY with bad     gateway.

  - Fix nsd-checkconf fail on bad zone name.

  - Annotate exit functions with noreturn.

  - Remove unused if clause during server service startup.

  - Fix #4156: Fix systemd service manager state change     notification When it is compiled, systemd readiness     signalling is enabled. The option in nsd.conf is not     used, it is ignored when read.

Update to upstream release 4.1.24 :

  - Features

  - #4102: control interface via local socket

  - configure --enable-systemd (needs pkg-config and     libsystemd) can be used to then use-systemd: yes in     nsd.conf and have readiness signalling with systemd.

  - RFC8162 support, for record type SMIMEA.

  - Bug Fixes

  - Patch to fix openwrt for mac os build darwin detection     in configure.

  - Fix that first control-interface determines if TLS is     used. Warn when IP address interfaces are used without     TLS.

  - #4106: Fix that stats printed from nsd-control are     recast from unsigned long to unsigned (remote.c).

  - Fix that type CAA (and URI) in the zone file can contain     dots when not in quotes.

  - #4133: Fix that when IXFR contains a zone with broken     NSEC3PARAM chain, NSD leniently attempts to find a     working NSEC3PARAM.

Update to upstream release 4.1.23 :

  - Fix NSD time sensitive TSIG compare vulnerability.

Update to upstream release 4.1.22 :

  - Features :

  - refuse-any sends truncation (+TC) in reply to ANY     queries over UDP, and allows TCP queries like normal.

  - Use accept4 to speed up answer of TCP queries

  - Bug fixes :

  - Fix nsec3 hash of parent and child co-hosted nsec3     enabled zones.

  - Fix to use same condition for nsec3 hash allocation and     free.

  - Changes in version 4.1.21 :

  - Features :

  - --enable-memclean cleans up memory for use with memory     checkers, eg. valgrind.

  - refuse-any nsd.conf option that refuses queries of type     ANY.

  - lower memory usage for tcp connections, so tcp-count can     be higher.

  - Bug fixes :

  - Fix spelling error in xfr-inspect.

  - Fix buffer size warnings from compiler on filename     lengths.

Resolves: rhbz#1609774 nsd-4.2.2 is available

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

SO-AND-SO reports :

nsd-checkzone in NLnet Labs NSD 4.2.0 has a Stack-based Buffer Overflow in the dname_concatenate() function in dname.c.

ID	Name	Product	Family	Severity
144120	openSUSE Security Update : nsd (openSUSE-2020-2222)	Nessus	SuSE Local Security Checks	critical
128575	Fedora 30 : nsd (2019-96fe76e02b)	Nessus	Fedora Local Security Checks	critical
127948	FreeBSD : nsd -- Stack-based Buffer Overflow (56778a31-c2a1-11e9-9051-4c72b94353b5)	Nessus	FreeBSD Local Security Checks	critical

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CVE-2019-13207

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