The default browser in Android versions older than 4.4 has a vulnerability that allows malicious websites to bypass a critical security mechanism and take control of a user’s authenticated sessions on other sites.

The issue is a universal cross-site scripting flaw that stems from how the browser handles javascript: strings preceded by a null byte character. When encountering such a string, the browser fails to enforce the same-origin policy, a security control that prevents scripts running in the context of one site from interacting with the content of other websites.

“What this means is, any arbitrary website (say, one controlled by a spammer or a spy) can peek into the contents of any other web page,” said Tod Beardsley, technical lead for the Metasploit Framework project, in a blog post Monday. “Imagine you went to an attacker’s site while you had your webmail open in another window — the attacker could scrape your e-mail data and see what your browser sees. Worse, he could snag a copy of your session cookie and hijack your session completely, and read and write webmail on your behalf.”

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