There are limits to 2FA and it can be near-crippling to your digital life

Even 2FA can run up against limitations—like this Find My iPhone attack.

As a graduate student studying cryptography, security and privacy (CrySP), software engineeringand human-computer interaction, I’ve learned a thing or two about security. Yet a couple of days back, I watched my entire digital life get violated and nearly wiped off the face of the Earth. That sounds like a bit of an exaggeration, but honestly it pretty much felt like that.

Here’s the timeline of a cyber-attack I recently faced on Sunday, July 24, 2016 (all times are in Eastern Standard):

That’s a pretty incidence matrix
That’s a pretty incidence matrix
Kapil Haresh

3:36pm—I was scribbling out an incidence matrix for a perfect hash family table on the whiteboard, explaining how the incidence matrix should be built to my friends. Ironically, this was a cryptography assignment for multicast encryption. Everything seemed fine until a rather odd sound started playing on my iPhone. I was pretty sure it was on silent, but I was quite surprised to see that it said “Find My iPhone Alert” on the lock screen. That was odd.

3:37pm—My iPhone’s lock screen changes. The screen dims, with the following message, “Hey why did you lock my iPhone haha. Call me at (123) 456–7890.”

This was when I realized what exactly was happening. My Apple ID had been compromised and the dimwit on the other end was probably trying to wipe all my Apple devices. Clearly he/she wasn’t very smart (to my benefit), and the adversary had decided to play the sound and kick the iPhone into Lost Mode before attempting to run the remote erase. When you throw a device into Lost Mode, it immediately attempts to get the physical location of the device and shows it to the adversary.

Sounds familiar? Of course, this was exactly what happened in August of 2012 with Mat Honan’s massive hack. In his case it happened through a slightly different way, but the end goal was the same—wipe the devices and destroy the data.

3:38pm—Naturally, I go into lockdown mode, and immediately take all my devices offline to stop whatever else the adversary was planning to do. When I knew I was being targeted in the same way as the Mat Honan attack, I expected would soon try to wipe my devices. True enough, I was able to confirm that they indeed attempted to wipe my iPhone and my Mac as well.

Because I managed to take all my devices offline, I was able to make sure all of them didn’t get their erase requests from the server. But this could have been worse, way worse.

After the Honan attack back in 2012, I decided to get two-factor authentication (2FA) turned on for my Apple ID to act as a safeguard. 2FA here was my friend to some extent, as in the case of iCloud. 2FA blocks any user attempting to login to your account, not allowing them to go any further than logging in and accessing Find My iPhone, Apple Pay, and Apple Watch settings — I don’t have Apple Pay and an Apple Watch for now, so I am not sure as to the extent of access for those two. But with Find My iPhone, this form of 2FA doesn’t protect it. This was kind of understood — if you lose your iPhone, you can’t get the second factor of authentication to get in to lock your iPhone.

One of the benefits of having 2FA was that things like my Mail, Contacts, Calendar and other documents were locked away. Without my 2FA code that comes either through my trusted device (via the Find My iPhone service) or via a text message, there wasn’t any way to get that unless the trusted device or the device that received the text message was compromised as well. Additionally, there was no way for the adversary to reset the password without getting the second authentication code.

2FA via iCloud
2FA via iCloud

I was able to lock my account with a new password and got all the erase requests cancelled. But herein lies the problems, which if addressed, could have prevented this attack or at least limit the potential damage. Put simply: the lack of 2FA for Find My iPhone and the lack of pattern monitoring on Apple’s servers were the two main reasons this attack took place.

Pattern monitoring

One of the things I did notice was that the login notification e-mails generally originate from the country you login from, especially in this day and age when Apple has a local division in most large, if not all, countries. I noticed this as I was able to check on my older login notification e-mails that I received when I lived in Australia . In that case all of my notifications were addressed from Apple Pty Ltd, while my logins from Canada were addressed from Apple Canada Inc.

In this case, the adversary’s login attempt resulted in a login e-mail from Ireland instead, which lead me to suspect they clearly were not in North America at least. Of course this could have beeen spoofed with the help of a VPN, but the location change could have been detected as it would be an outlier from my regular logins from Canada. The other, clearer differentiation of the pattern was the part where the login was done on a Windows computer, instead of a Mac . In my case, this would have been quite an outlier as I normally use a Mac and can probably count the number of times I have logged in using a Windows computer.

Ideally, at this point, it would have been reasonable for Apple to check if this was a legitimate login — for example, using one of the secondary accounts nominated in the Apple ID. Microsoft actually does this if you attempt to use your Microsoft account on a new device or a device that isn’t normally used, and the company locks the account and gets you to confirm the login through your secondary accounts.


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