Users of Chrome and Firefox browser extensions have had their personal data scooped up and sold, a security researcher has discovered. The privacy fiasco, dubbed DataSpii, affects more than 4 million users and 50 companies worldwide.
Ars Technica reports:
When we use browsers to make medical appointments, share tax returns with accountants, or access corporate intranets, we usually trust that the pages we access will remain private. DataSpii, a newly documented privacy issue in which millions of people's browsing histories have been collected and exposed, shows just how much about us is revealed when that assumption is turned on its head.
DataSpii begins with browser extensions—available mostly for Chrome but in more limited cases for Firefox as well—that, by Google's account, had as many as 4.1 million users. These extensions collected the URLs, webpage titles, and in some cases the embedded hyperlinks of every page that the browser user visited. Most of these collected Web histories were then published by a fee-based service called Nacho Analytics, which markets itself as "God mode for the Internet" and uses the tag line "See Anyone’s Analytics Account."
Web histories may not sound especially sensitive, but a subset of the published links led to pages that are not protected by passwords—but only by a hard-to-guess sequence of characters (called tokens) included in the URL. Thus, the published links could allow viewers to access the content at these pages. (Security practitioners have long discouraged the publishing of sensitive information on pages that aren't password protected, but the practice remains widespread.)
According to the researcher who discovered and extensively documented the problem, this non-stop flow of sensitive data over the past seven months has resulted in the publication of links to: