Web Surfing History Is Accessible (Without Your Permission) Via JavaScript

The Web surfing history saved in your Web browser can be accessed without your permission. JavaScript code deployed by real websites and online advertising providers use browser vulnerabilities to determine which sites you have and have not visited, according to new research from computer scientists at the University of California, San Diego.
“JavaScript is a great thing, it allows things like Gmail and Google Maps and a whole bunch of Web 2.0 applications; but it also opens up a lot of security vulnerabilities. We want to let the broad public know that history sniffing is possible, it actually happens out there, and that there are a lot of people vulnerable to this attack,” said UC San Diego computer science professor Sorin Lerner.

The researchers documented JavaScript code secretly collecting browsing histories of Web users through “history sniffing” and sending that information across the network. While history sniffing and its potential implications for privacy violation have been discussed and demonstrated, the new work provides the first empirical analysis of history sniffing on the real Web.

“Nobody knew if anyone on the Internet was using history sniffing to get at users’ private browsing history. What we were able to show is that the answer is yes,” said UC San Diego computer science professor Hovav Shacham.

The computer scientists from the UC San Diego Jacobs School of Engineering presented this work in October at the 2010 ACM Conference on Computer and Communications Security (CCS 2010) in a paper entitled, “An Empirical Study of Privacy-Violating Information Flows in JavaScript Web Applications.”
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