A Chrome extension that AVG AntiVirus automatically installs on users’ systems exposes browsing history and other personal data to the Internet, Google Project Zero researcher Tavis Ormandy has discovered.
According to Ormandy’s report, the Chrome extension, dubbed AVG Web TuneUp and featuring extension id chfdnecihphmhljaaejmgoiahnihplgn, is force-installed on the end-user systems along with the AVG AntiVirus application. The extension adds a series of vulnerabilities to the browser, thus putting its more than 9 million installed users at risk.
Among the vulnerabilities that AVG Web TuneUp brings along, the researcher mentions a “trivial universal” XSS (Cross-Site Scripting) in the "navigate" API, which could allow websites to execute scripts in the context of any other domains. According to Ormandy, a website could read emails from mail.google.com and perform other actions as well because of this high-severity flaw.