Fedora: Security Advisory for High-Performance DNS Update

Knot DNS is a high-performance authoritative DNS server implementation.

Major updates for Knot DNS and Knot Resolver: Knot Resolver 1.5.0 (2017-11-02)

================================ Bugfixes -------- - fix loading modules on

Darwin Improvements ------------ - new module ta_signal_query supporting

Signaling Trust Anchor Knowledge using Keytag Query (RFC 8145 section 5); it

is enabled by default - attempt validation for more records but require it for

fewer of them (e.g. avoids SERVFAIL when server adds extra records but omits

RRSIGs) Knot Resolver 1.4.0 (2017-09-22) ===============================Incompatible changes -------------------- - lua: query flag-sets are no longer

represented as plain integers. kres.query.* no longer works, and kr_query_t

lost trivial methods 'hasflag' and 'resolved'. You can instead write code

like qry.flags.NO_0X20 = true. Bugfixes -------- - fix exiting one of multiple

forks (#150) - cache: change the way of using LMDB transactions. That in

particular fixes some cases of using too much space with multiple kresd forks

(#240). Improvements ------------ - policy.suffix: update the aho-corasick code

(#200) - root hints are now loaded from a zonefile; exposed as

hints.root_file(). You can override the path by defining ROOTHINTS during

compilation. - policy.FORWARD: work around resolvers adding unsigned NS records

(#248) - reduce unneeded records previously put into authority in wildcarded

answers Knot Resolver 1.3.3 (2017-08-09) ===============================Security -------- - Fix a critical DNSSEC flaw. Signatures might be accepted as

valid even if the signed data was not in bailiwick of the DNSKEY used to

sign it, assuming the trust chain to that DNSKEY was valid. Bugfixes -------- -iterate: skip RRSIGs with bad label count instead of immediate SERVFAIL - utils:

fix possible incorrect seeding of the random generator - modules/http: fix

compatibility with the Prometheus text format Improvements ------------ -policy: implement remaining special-use domain names from RFC6761 (#205), and

make these rules apply only if no other non-chain rule applies Knot DNS 2.6.1

(2017-11-02) =========================== Features: --------- - NSEC3 Opt-Out

support in the DNSSEC signing - New CDS/CDNSKEY publish configuration option

Improvements: ------------- - Simplified DNSSEC log message with DNSKEY details

- +tls-hostname in kdig implies +tls-ca if neither +tls-ca nor +tls-pin is given

- New documentation sections for DNSSEC key rollovers and shared keys - Keymgr

no longer prints useless algorithm number for generated key - Kdig prints

unknown RCODE in a numeric format - Better support for LLVM libFuzzer

Bugfixes: --------- - Faulty DNAME semantic check if present in the zone apex

and NSEC3 is used - Immediate zone flush not scheduled during the zone load

event - Server crashes upon dynamic zone addition if a query module is loaded

- Kdig fails to connect over TLS due to SNI is set to server IP address -Possible out-of-bounds memory access at the end of the input - TCP Fast Open

enabled by default in kdig breaks TLS connection Knot DNS 2.6.0 (2017-09-29)

=========================== Features: --------- - On-slave (inline) signing

support - Automatic DNSSEC key algorithm rollover - Ed25519 algorithm support

in DNSSEC (requires GnuTLS 3.6.0) - New 'journal-content' and 'zonefile-load'

configuration options - keymgr tries to run as user/group set in the

configuration - Public-only DNSSEC key import into KASP DB via keymgr - NSEC3

resalt and parent DS query events are persistent in timer DB - New processing

state for a response suppression within a query module - Enabled server side

TCP Fast Open if supported - TCP Fast Open support in kdig Improvements:

------------- - Better record owner compression if related to the previous

rdata dname - NSEC(3) chain is no longer recomputed whole on every update -Remove inconsistent and unnecessary quoting in log files - Avoiding of

overlapping key rollovers at a time - More DNSSSEC-related semantic checks -Extended timestamp format in keymgr Bugfixes: --------- - Incorrect journal

free space computation causing inefficient space handling - Interface-automatic

broken on Linux in the presence of asymmetric routing Knot DNS 2.5.6

(2017-11-02) =========================== Improvements: ------------- - Keymgr

no longer prints useless algorithm number for generated key Bugfixes: ---------- Faulty DNAME semantic check if present in the zone apex and NSEC3 is used -Immediate zone flush not scheduled during the zone load event - Server crashes

upon dynamic zone addition if a query module is loaded - Kdig fails to connect

over TLS due to SNI is set to server IP address Knot DNS 2.5.5 (2017-09-29)

=========================== Improvements: ------------- - Constant time memory

comparison in the TSIG processing - Proper use of the ctype functions -Generated RRSIG records have inception time 90 minutes in the past Bugfixes:

--------- - Incorrect online signature for NSEC in the case of a CNAME record

- Incorrect timestamps in dnstap records - EDNS Subnet Client validation

rejects valid payloads - Module configuration semantic checks are not executed

- Kzonecheck segfaults with unusual inputs Knot DNS 2.5.4 (2017-08-31)

=========================== Improvements: ------------- - New minimum and

maximum refresh interval config options (Thanks to Manabu Sonoda) - New warning

when unforced flush with disabled zone file synchronization - New 'dnskey'

keymgr command - Linking with libatomic on architectures that require it

(Thanks to Pierre-Olivier Mercier) - Removed 'OK' from listing keymgr command

outputs - Extended journal and keymgr documentation and logging Bugfixes:

--------- - Incorrect handling of specific corner-cases with zone-in-journal -The 'share' keymgr command doesn't work - Server crashes if configured with

query-size and reply-size statistics options - Malformed big integer

configuration values on some 32-bit platforms - Keymgr uses local time when

parsing date inputs - Memory leak in kdig upon IXFR query

su -c 'dnf upgrade knot' at the command line.

For more information, refer to the dnf documentation available at

https://dnf.readthedocs.io/en/latest/command_ref.html

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