bind -- denial of service vulnerability

ISC reports:

We have today posted updated versions of 9.9.6 and 9.10.1
to address a significant security vulnerability in DNS
resolution. The flaw was discovered by Florian Maury of
ANSSI, and applies to any recursive resolver that does not
support a limit on the number of recursions. [CERTFR-2014-AVI-512],
[USCERT VU#264212]
A flaw in delegation handling could be exploited to put named
into an infinite loop, in which each lookup of a name server
triggered additional lookups of more name servers. This has
been addressed by placing limits on the number of levels of
recursion named will allow (default 7), and on the number of
queries that it will send before terminating a recursive query
(default 50). The recursion depth limit is configured via the
max-recursion-depth option, and the query limit via the
max-recursion-queries option. For more information, see the
security advisory at https://kb.isc.org/article/AA-01216/.
[CVE-2014-8500]
[RT #37580]
In addition, we have also corrected a potential security
vulnerability in the GeoIP feature in the 9.10.1 release only.
For more information on this issue, see the security advisory
at https://kb.isc.org/article/AA-01217.
[CVE-2014-8680]