There are many interesting little bits of data your computer broadcasts to the network, especially when it first starts up. Putting some of these bits together can reveal information about what WiFi access points you’ve connected to in the past, the last IP address you had from DHCP, your default network shares that you connect to, and so on. This phenomenon is called data seepage, and is difficult to prevent – especially while taking advantage of public wireless hot spots. A new tool, called Ferret, is designed to listen for this broadcast information and correlate it together, to paint a picture of a particular system or user. In some cases it can even determine such details as who is on your buddy list. Ferret was recently presented at Black Hat by its creators (Errata Security), and it’s still in a proof of concept stage… but quite interesting.
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