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.
A specially crafted query could trigger an assertion failure in message.c.
This flaw was discovered by Jonathan Foote, and is disclosed in CVE-2015-5477. [RT #39795]
On servers configured to perform DNSSEC validation, an assertion failure could be triggered on answers from a specially configured server.
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
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 version negotiation.
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
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.
Asynchronous zone loads were not handled correctly when the zone load was already in progress; this could trigger a crash in zt.c. [RT #37573]
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]
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]
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. https://www.isc.org/downloads/software-support-policy/
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 http://www.isc.org/donate/.