INFOSEC - 'Evil twin' Wi-Fi access points proliferate

Wi-Fi users should beware of free hot spots, which might have been set up by hackers in public areas to snoop on Internet surfing, a security expert warns.

The next time you splurge on a double latte and sip it while browsing the Internet via the cafe's Wi-Fi, beware of the "evil twin."

That's the term for a Wi-Fi access point that appears to be a legitimate one offered on the premises, but actually has been set up by a hacker to eavesdrop on wireless communications among Internet surfers. Unfortunately, experts say there is little consumers can do to protect themselves, but enterprises may be in better shape.

With the growth in wireless networks, the "evil twin" type of attack is on the rise, said Phil Cracknell, president of the U.K. branch of the Information Systems Security Association. Such attacks are much easier than others seeking logins or passwords, such as phishing, which involves setting up a fraudulent Web site and luring people there, Cracknell said.

A rogue Wi-Fi connection can be set up on a laptop with a bit of simple programming and a special USB (Universal Serial Bus) thumb drive that acts as an access point. The access points are hard to trace, since they can suddenly be shut off, and are easy to build, Cracknell said.

The growth in the number of Wi-Fi networks poses increasing opportunities for hackers, who can make their networks appear to be legitimate by simply giving their access point a similar name to the Wi-Fi network on the premises. Since the hacker may be physically closer to the victim than the real access point, their signal will be stronger, potentially drawing more victims.

The hacker's computer can be configured to pass the person through to the legitimate access point while monitoring the traffic of the victim. Several free programs available on the Internet can decode packets to reveal clear-text logins and passwords.

"You are going to harvest some incredible information in a short span of time with a rogue hot spot," Cracknell said.

Corporate users can protect themselves by using VPN (virtual private network) when logging into company servers, Cracknell said. But consumers are at a particular disadvantage, since they are likely not using VPN and will access free Web e-mail applications that could send passwords in clear text.

Wi-Fi hot spot owners tend to be "absolutely ignorant" of the attack, although they should regularly monitor their network for rogue access points, Cracknell said. Another problem is reporting: victims may not even know how their information was pinched, and those who run the hot spot may be reluctant to reveal that hackers exploited their network.

Consumers can protect themselves at least one way: be wary of free hotspots. Many airports and cafes charge for access, so a free hot spot could be designed to ensnare potential victims. Also, the attack has been used in hotels, with the "evil twin" actually coming from a nearby hacker guest.

The risk is still great. "This [attack] is foolproof to a degree," Cracknell said.

Join the newsletter!

Or

Sign up to gain exclusive access to email subscriptions, event invitations, competitions, giveaways, and much more.

Membership is free, and your security and privacy remain protected. View our privacy policy before signing up.

Error: Please check your email address.
Keep up with the latest tech news, reviews and previews by subscribing to the Good Gear Guide newsletter.

Jeremy Kirk

IDG News Service
Show Comments

Brand Post

Shining a light on creativity

MSI has long pushed the boundaries of invention with its ever-evolving range of laptops but it has now pulled off a world first with the new MSI Creative 17.

Most Popular Reviews

Latest Articles

Resources

PCW Evaluation Team

Tom Pope

Dynabook Portégé X30L-G

Ultimately this laptop has achieved everything I would hope for in a laptop for work, while fitting that into a form factor and weight that is remarkable.

Tom Sellers

MSI P65

This smart laptop was enjoyable to use and great to work on – creating content was super simple.

Lolita Wang

MSI GT76

It really doesn’t get more “gaming laptop” than this.

Jack Jeffries

MSI GS75

As the Maserati or BMW of laptops, it would fit perfectly in the hands of a professional needing firepower under the hood, sophistication and class on the surface, and gaming prowess (sports mode if you will) in between.

Taylor Carr

MSI PS63

The MSI PS63 is an amazing laptop and I would definitely consider buying one in the future.

Christopher Low

Brother RJ-4230B

This small mobile printer is exactly what I need for invoicing and other jobs such as sending fellow tradesman details or step-by-step instructions that I can easily print off from my phone or the Web.

Featured Content

Product Launch Showcase

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?