Full Disclosure mailing list archives
RE: Re: recursive DNS servers DDoS as a growing DDoSproblem
From: "Geo." <geoincidents () nls net>
Date: Wed, 8 Mar 2006 13:27:18 -0500
In the scenario you describe, I cannot see any actual amplification...
I'll give you a senario where you can see. lets say you have 2 name servers that are local to you. I setup a domain, example.com. In this domain I create a text record which is 100K in length, I don't know, perhaps I paste the source code to decss in it, whatever it's a big text record. Now I simply spoof a UDP packet using your IP address as the source address and send it to both of your dns servers. This packet is a query for the example.com text record. I have now sent two very small packets and you have received 200K of traffic. That's the amplification, one small udp packet, one large text record in return. Note, I don't have to use your local servers, but this way it makes it more fun to troubleshoot because it looks like you are the cause of your own flooding.. Geo. _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/
Current thread:
- Re: recursive DNS servers DDoS as a growing DDoS problem Ventsislav Genchev (Mar 08)
- RE: Re: recursive DNS servers DDoS as a growing DDoSproblem Geo. (Mar 08)
- Re: Re: recursive DNS servers DDoS as a growing DDoSproblem Security Lists (Mar 08)
- Re: Re: recursive DNS servers DDoS as a growing DDoSproblem gboyce (Mar 08)
- Re: Re: recursive DNS servers DDoS as a growing DDoSproblem Mark Senior (Mar 08)
- Re: Re: recursive DNS servers DDoS as a growing DDoSproblem Måns Nilsson (Mar 13)
- Re: Re: recursive DNS servers DDoS as a growing DDoSproblem Security Lists (Mar 08)
- RE: Re: recursive DNS servers DDoS as a growing DDoSproblem Geo. (Mar 08)