BIND 9.10.3 is now available.
mcnally at isc.org
Wed Sep 16 02:43:45 UTC 2015
This document summarizes changes since the last production release of
BIND on the corresponding major release branch.
The latest versions of BIND 9 software can always be found at
http://www.isc.org/downloads/. There you will find additional
information about each release, source code, and pre-compiled versions
for Microsoft Windows operating systems.
* An incorrect boundary check in the OPENPGPKEY rdatatype could
trigger an assertion failure. This flaw is disclosed in
CVE-2015-5986. [RT #40286]
* A buffer accounting error could trigger an assertion failure when
parsing certain malformed DNSSEC keys.
This flaw was discovered by Hanno Böck of the Fuzzing Project, and
is disclosed in CVE-2015-5722. [RT #40212]
* A specially crafted query could trigger an assertion failure in
This flaw was discovered by Jonathan Foote, and is disclosed in
CVE-2015-5477. [RT #40046]
* On servers configured to perform DNSSEC validation, an assertion
failure could be triggered on answers from a specially configured
This flaw was discovered by Breno Silveira Soares, and is disclosed
in CVE-2015-4620. [RT #39795]
* New quotas have been added to limit the queries that are sent by
recursive resolvers to authoritative servers experiencing
denial-of-service attacks. When configured, these options can both
reduce the harm done to authoritative servers and also avoid the
resource exhaustion that can be experienced by recursives when they
are being used as a vehicle for such an attack.
NOTE: These options are not available by default; use configure
--enable-fetchlimit to include them in the build.
+ fetches-per-server limits the number of simultaneous queries
that can be sent to any single authoritative server. The
configured value is a starting point; it is automatically
adjusted downward if the server is partially or completely
non-responsive. The algorithm used to adjust the quota can be
configured via the fetch-quota-params option.
+ fetches-per-zone limits the number of simultaneous queries
that can be sent for names within a single domain. (Note:
Unlike "fetches-per-server", this value is not self-tuning.)
Statistics counters have also been added to track the number of
queries affected by these quotas.
* dig +ednsflags can now be used to set yet-to-be-defined EDNS flags
in DNS requests.
* dig +[no]ednsnegotiation can now be used enable / disable EDNS
* An --enable-querytrace configure switch is now available to enable
very verbose query tracelogging. This option can only be set at
compile time. This option has a negative performance impact and
should be used only for debugging.
* Large inline-signing changes should be less disruptive. Signature
generation is now done incrementally; the number of signatures to
be generated in each quantum is controlled by
"sig-signing-signatures number;". [RT #37927]
* The experimental SIT extension now uses the EDNS COOKIE option code
point (10) and is displayed as "COOKIE: <value>". The existing
named.conf directives; "request-sit", "sit-secret" and
"nosit-udp-size", are still valid and will be replaced by
"send-cookie", "cookie-secret" and "nocookie-udp-size" in BIND
9.11. The existing dig directive "+sit" is still valid and will be
replaced with "+cookie" in BIND 9.11.
* When retrying a query via TCP due to the first answer being
truncated, dig will now correctly send the COOKIE value returned by
the server in the prior response. [RT #39047]
* Retrieving the local port range from net.ipv4.ip_local_port_range
on Linux is now supported.
* Active Directory names of the form gc._msdcs.<forest> are now
accepted as valid hostnames when using the check-names option.
<forest> is still restricted to letters, digits and hyphens.
* Names containing rich text are now accepted as valid hostnames in
PTR records in DNS-SD reverse lookup zones, as specified in RFC
6763. [RT #37889]
* Asynchronous zone loads were not handled correctly when the zone
load was already in progress; this could trigger a crash in zt.c.
* A race during shutdown or reconfiguration could cause an assertion
failure in mem.c. [RT #38979]
* Some answer formatting options didn't work correctly with dig
+short. [RT #39291]
* Malformed records of some types, including NSAP and UNSPEC, could
trigger assertion failures when loading text zone files. [RT
#40274] [RT #40285]
* Fixed a possible crash in ratelimiter.c caused by NOTIFY messages
being removed from the wrong rate limiter queue. [RT #40350]
* The default rrset-order of random was inconsistently applied. [RT
* BADVERS responses from broken authoritative name servers were not
handled correctly. [RT #40427]
* Several bugs have been fixed in the RPZ implementation:
+ Policy zones that did not specifically require recursion could
be treated as if they did; consequently, setting
qname-wait-recurse no; was sometimes ineffective. This has
been corrected. In most configurations, behavioral changes due
to this fix will not be noticeable. [RT #39229]
+ The server could crash if policy zones were updated (e.g. via
rndc reload or an incoming zone transfer) while RPZ processing
was still ongoing for an active query. [RT #39415]
+ On servers with one or more policy zones configured as slaves,
if a policy zone updated during regular operation (rather than
at startup) using a full zone reload, such as via AXFR, a bug
could allow the RPZ summary data to fall out of sync,
potentially leading to an assertion failure in rpz.c when
further incremental updates were made to the zone, such as via
IXFR. [RT #39567]
+ The server could match a shorter prefix than what was
available in CLIENT-IP policy triggers, and so, an unexpected
action could be taken. This has been corrected. [RT #39481]
+ The server could crash if a reload of an RPZ zone was
initiated while another reload of the same zone was already in
progress. [RT #39649]
+ Query names could match against the wrong policy zone if
wildcard records were present. [RT #40357]
End of Life
The end of life for BIND 9.10 is yet to be determined but will not be
before BIND 9.12.0 has been released for 6 months.
Thank you to everyone who assisted us in making this release possible.
If you would like to contribute to ISC to assist us in continuing to
make quality open source software, please visit our donations page at
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