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LAS VEGAS -- A powerful new type of Internet attack works like a telephone tap, but it operates between computers and Web sites they trust.
Hackers at the Black Hat and DefCon security conferences have revealed a serious flaw in the way Web browsers weed out untrustworthy sites and block anybody from seeing them. If a criminal infiltrates a network, he can set up a secret eavesdropping post and capture credit card numbers, passwords and other sensitive data flowing between computers on that net
Originally posted by HunkaHunka
In the following picture, I just scribbled out, you have Amazon.com (or any other web site) on the right.
Down on the left we have a starbucks (or other wifi enabled location). In this scenario, the bad guy is on the same wireless segment (He doesn't have to be). Also in the picture below, the bad guy has managed to become the victims gateway through a poisoned arp cache technique or some other mechanism. He then intercepts the communications between the victim and amazon.com
Now, using The Middler, a different tool being released this weekend, you could simply inject an iframe on the first non-ssl connection.
But using this new technique Kaminsky is talking about, you can also simply mod the server certificate of a WELL KNOWN SITE and present it to the client without it realizing the difference.