DNS are being attacked

Since a few hours, if you type a wrong URL, you might have the classical ERROR page...or you can be redirected to the website "RX Med" which is selling Viagra.
It seems that someone has misused a root server to redirect wrong URL to a specified web page. It does not work all the time (apparently it links to a series of IPs, among them only a few are linking to "RX Med" web page, probably to avoid saturating this web site I guess).
The bad part of this story is that all over the planet, DNS are sharing this info. In summary when a wrong URL ends up to "RX Med" web page, then DNS will now consider this as an info: all DNS are currently filling up databases of wrong URL which have been then "successfully" redirected to "RX Med" page.