No boundaries for user identities: Web trackers exploit browser login managers

Link articolo originaleArchivio di tutti i clip: clips.quintarelli.it (Notebook di Evernote).No boundaries for user identities: Web trackers exploit browser login managers In this second installment of the No Boundaries series, we show how a long-known vulnerability in browsers’ built-in password managers is abused by third-party scripts for tracking on more than a thousand sites. by Gunes Acar, Steven Englehardt, and Arvind Narayanan We show how third-party scripts exploit browsers’ built-in login managers (also called password managers) to retrieve and exfiltrate user identifiers without user awareness. To the best of our knowledge, our research is the first to show that login managers are being abused by third-party scripts for the purposes of web tracking. The underlying vulnerability of login managers to credential theft has been known for years. Much of the past discussion has focused on password exfiltration by malicious scripts through cross-site scripting (XSS) attacks. Fortunately, we haven’t found password theft on the 50,000 sites that we analyzed. Instead, we found tracking scripts embedded by the first party abusing the same technique to extract emails addresses for building tracking identifiers. The image above shows the process. First, a user fills out a login form on the page and asks the browser to save the login. The tracking script is not present on the login page . Then, the user visits another page on the same w[...]

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