An attacker would need to have your password as well as your phone or device in order to access your account. To log in, you supply both your password and the current authenticator code.
The app generates a code that is good for about 30 seconds. TeamViewer's implementation of two-factor authentication uses a mobile "authenticator app" on your phone or mobile device.
Enable two-factor authentication for your TeamViewer account. Regardless, a few precautions can limit the potential for harm. If My LinkedIn password were stolen in 2012, and I changed it, but I used the same password for TeamViewer and never changed it, it is entirely possible a crook could discover my old LinkedIn password and use it to break into my TeamViewer account. Many of these passwords are years old, from incidents long ago discovered and reported on - but password reuse remains common. The latter is entirely plausible: over the past few weeks, somewhere close to a half BILLION email and password combinations have turned up for sale on underground markets. It is not clear whether the TeamViewer service itself has been compromised, or if the crooks are simply taking passwords from the many recently-discovered breaches (LinkedIn, Tumblr, MySpace, etc.) and finding that the same password works for a person's TeamViewer account. Any computer that can be controlled over the Internet by me though, could potentially also be controlled over the Internet by a malicious hacker that knew the right access information. I personally have used it and services like it to provide technical support for distant family from the comfort of my living room. TeamViewer is a handy way to log into and control multiple computers from one location. I've seen a lot of noise over the past 24 hours suggesting that TeamViewer - a popular remote control product for computers - is being used by crooks to break into PCs, then use logged-in sessions on those computers to make purchases, transfer money, etc.
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