Last week, KrebsOnSecurity received an email from eBay. The company wanted me to switch from using a hardware key fob when logging into eBay to receiving a one-time code sent via text message. I found it remarkable that eBay, which at one time was well ahead of most e-commerce companies in providing more robust online authentication options, is now essentially trying to downgrade my login experience to a less-secure option.
In early 2007, PayPal (then part of the same company as eBay) began offering its hardware token for a one-time $5 fee, and at the time the company was among very few that were pushing this second-factor (something you have) in addition to passwords for user authentication. In fact, I wrote about this development back when I was a reporter at The Washington Post:
“Armed with one of these keys, if you were to log on to your account from an unfamiliar computer and some invisible password stealing program were resident on the machine, the bad guys would still be required to know the numbers displayed on your token, which of course changes every 30 seconds. Likewise, if someone were to guess or otherwise finagle your PayPal password.”
I’ve still got the same hardware token I ordered when writing about that offering, and it’s been working well for the past decade. Now, eBay is asking me to switch from the key fob to text messages, the latter being a form of authentication that security experts say is less secure than other forms of two-factor authentication (2FA).
The move by eBay comes just months after the National Institute for Standards and Technology (NIST) released a draft of new authentication guidelines that appear to be phasing out the use of SMS-based two-factor authentication. NIST said one-time codes that are texted to users over a mobile phone are vulnerable to interception, noting that thieves can divert the target’s SMS messages and calls to another device (either by social engineering a customer service person at the phone company, or via more advanced attacks like SS7 hacks). Continue reading →