Browsers leak sensitive info to hackers

Posted on Friday January 27, 2017

The Autofill feature fills a void in the web browsing habits of many. It eliminates the need to enter all your details when logging on your social media accounts or when checking out your basket after e-shopping. On Chrome and Safari browsers, however, danger lurks when you rely too much on autofill. Without knowing it, you may be exposing personal information to hackers who have found a way to steal your credit card info and shop at your expense.

How do they do it?

By concealing other fields in a sign-up form, users are tricked into thinking they only have to fill out a few fields. The trickery at work is that upon auto-sign up, other fields, which could include your billing address, phone number, credit card number, cvv (the 3-digit code used to validate credit card transactions), and other sensitive information, are auto-filled with the user none the wiser.

This sinister trick is nothing new, but since there hasn’t been any countermeasure since it was first discovered, the threat it poses is worth emphasizing. Finnish whitehat hacker Viljami Kuosmanen recently brought to light how users of Chrome and Safari are particularly vulnerable, and he even came up with a demonstration of how this phishing technique is perpetrated. The technique is so sneaky, it’s enough to make one give up online shopping forever.

Using plugins and programs such as password managers is also fraught with the security risk, as having access to such a utility empowers cyberthieves to do more than just obtain your credit card info; it opens them up to a great amount of personal details.

Preventing an autofill-related theft

So what can you do to avoid falling prey?

Using Mozilla Firefox is one of the easiest available solutions. As of today, Mozilla hasn’t devised a mechanism that affords its users the same convenience that Chrome and Safari users enjoy with autofill. When filling web forms on Firefox, users still have to manually pre-fill each data field due to a lack of a multi-box autofill functionality – a blessing in disguise, given the potential for victimization in autofill-enabled browsers.

Another quick fix is disabling the autofill feature on your Chrome, Safari and Opera (for Apple mobile devices) browsers. This would mean that when filling out web forms, you'd have to manually type responses for every field again, but at least you'd be more secure.

It’s not exactly the most sophisticated form of online data and identity theft, but complacency can result in being victimized by cyber swindlers. Take the first step in ensuring your systems’ safety by getting in touch with our security experts today.