Categories
Domain Name System Security Extensions (DNSSEC)

DNS Security Advisories Out Today For BIND, PowerDNS and Unbound – Time To Upgrade!

DNSWhile this has nothing to do specifically with the topic of DNSSEC that we cover here on Deploy360, there is important news in the broader world of “DNS security”.  The vendors of three of the major DNS recursive resolvers today released security advisories about a particularly nasty bug where the resolver can be tricked into trying to follow essentially an infinite loop and wind up exhausting all resources and potentially shutting down.  The advisories from BIND, PowerDNS and Unbound are found at these links:

The advisories from both PowerDNS and Unbound indicate that this bug would be difficult for an attacker to exploit unless they were within the user base of the recursive resolver.  The BIND advisory is more open-ended and indicates the bug could be executed remotely.

In all cases the easiest solution is to upgrade to the newest versions:

While there are apparently no known exploits of the bug in the wild yet, that will now only be a matter of time.  It would be best to upgrade your recursive resolvers as soon as possible.

P.S. While you are in there updating your DNS resolver, if you are using BIND or Unbound, why not enable DNSSEC validation?  It’s a simple change in the configuration file, as shown in this SURFnet white paper.

Categories
Deploy360 Domain Name System Security Extensions (DNSSEC)

Video: BIND and DNSSEC – What Is New?

How does BIND work with DNSSEC? How easy is it to configure? What new features does it have that makes DNSSEC signing simple? How does it work as a DNSSEC-validating resolver? To answer these questions, I interviewed Eddy Winstead about BIND and what it can do with DNSSEC. We discussed BIND’s features as well as new training programs and documentation. It was an enjoyable interview that we recorded while Eddy and I were both at ICANN 51 in Los Angeles.  You can read more and download BIND from http://www.isc.org/ and more information about DNSSEC can be found from our Start Here page.

Enjoy!