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Security Researcher Kaminsky Pushes DNS Patching
BobB-nw writes "Dan Kaminsky, who for years was ambivalent about securing DNS, has become an ardent supporter of DNS Security Extensions.
Speaking at the Black Hat DC 2009 conference Thursday, the prominent security researcher told the audience that the lack of DNS security not only makes the Internet vulnerable, but is also crippling the scalability of important security technologies. 'DNS is pretty much our only way to scale systems across organizational boundaries, and because it is insecure it's infecting everything else that uses' DNS, the fundamental Internet protocol that provides an IP address for a given domain name, said Kaminsky, director of penetration testing at IOActive. 'The only group that has actually avoided DNS because it's insecure are security technologies, and therefore those technologies aren't scaling.'"
In case anyone was wondering who Dan Kaminsky is, besides being the one who discovered the recent DNS vulnerability, he also did research regarding the Sony rootkit. His picture is available online, and he looks like a regular decent guy, for whatever that's worth. He's written some sort of port scanner called scanrand, and started a company called Doxpara Research.
Qxe4
Why think when you can actually check?
http://tinyurl.com/dg5h7z
See link 1, click once. Read the last two paragraphs. To me that seems like a published position.
Click the "back" button. Read the next few links.
Enjoy.
E
djb thought potential exploits would appear without port randomization, but he didnt discover this particular flaw. Kaminsky did. As a car analogy, its like saying putting chips in keys keeps cars from being stolen, but coming up with a non-obvious hack that always starts the car without a key is its own work. Even Schneier says so:
Kaminsky's vulnerability is a perfect example of this. Years ago, cryptographer Daniel J. Bernstein looked at DNS security and decided that Source Port Randomization was a smart design choice. That's exactly the work-around being rolled out now following Kaminsky's discovery. Bernstein didn't discover Kaminsky's attack; instead, he saw a general class of attacks and realized that this enhancement could protect against them. Consequently, the DNS program he wrote in 2000, djbdns, doesn't need to be patched; it's already immune to Kaminsky's attack.
AUTH=Make sure you get your data from the right sources.
Okay.
ENCR=make sure the data are correct.
Huh?
Encryption makes the information secure from snooping, which is pointless in the case of DNS as it is public information by definition.
Signing makes sure the data has not been tampered with. Which is more or less the same as authentication.
Sorry to disappoint you, but you can't "verify" DNS by "querying" if the original data are unprotected.
That is the general idea of how SSL and the CA's work, only with DNS we don't really care if other people know what you are looking for, we just care that we are getting the correct response from the correct server, which requires signing of the responses, which is authentication. That is, with DNS we only really need signing of the data for transfers and queries, not encryption.