Facebook's iOS 'bug' secretly filmed users. IT, take note.
Credit to Author: Evan Schuman| Date: Wed, 20 Nov 2019 09:41:00 -0800
News reports last week — subsequently confirmed by a Facebook executive’s tweet — that the Facebook iOS app was videotaping users without notice should serve as a critical heads up to enterprise IT and security execs that mobile devices are every bit as risky as they feared. And a very different bug, planted by cyberthieves, presents even more frightening camera-spying issues with Android.
On the iOS issue, the confirmation tweet from Guy Rosen, who is Facebook’s vice president of Integrity (go ahead and insert whatever joke you want about Facebook having a vice president of integrity; for me, it’s way too easy a shot), said, “We recently discovered our iOS app incorrectly launched in landscape. In fixing that last week in v246, we inadvertently introduced a bug where the app partially navigates to the camera screen when a photo is tapped. We have no evidence of photos/videos uploaded due to this.”
Please forgive me if I don’t immediately accept that this filming was an error, nor that Facebook has no evidence of any photos/videos being uploaded. When it comes to being candid about their privacy moves and the real intentions behind them, Facebook executives’ track record isn’t great. Consider this Reuters story from earlier this month that cited court documents establishing that “Facebook began cutting off access to user data for app developers from 2012 to squash potential rivals while presenting the move to the general public as a boon for user privacy.” And, of course, who can forget Cambridge Analytica?
In this case, though, intentions are irrelevant. This situation merely serves as a reminder of what apps can do if no one is paying enough attention.
This is what happened, according to a well-done summary of the incident in The Next Web (TNW): “The problem becomes evident due to a bug that shows the camera feed in a tiny sliver on the left side of your screen, when you open a photo in the app and swipe down. TNW has since been able to independently reproduce the issue.”
This all began when an iOS Facebaook user named Joshua Maddux tweeted about his scary discovery. “In footage he shared, you can see his camera actively working in the background as he scrolls through his feed.”
It seems as though the FB app for Android does not do the same video effort — or, if it does happen on Android, it’s better at hiding its stealthy behavior. If it is the case that this only happens on iOS, that would suggest that it might indeed be just an accident. Otherwise, why wouldn’t FB have done it for both versions of its app?
As for iOS vulnerability — note that Rosen didn’t say that the glitch was fixed or even promise when it would be fixed — it seems to depend on the specific iOS version. From the TNW report: “Maddux adds he found the same issue on five iPhone devices running iOS 13.2.2, but was unable to reproduce it on iOS 12. ‘I will note that iPhones running iOS 12 don’t show the camera, not to say that it’s not being used,’ he said. The findings are consistent with [TNW’s] attempts. [Although] iPhones running iOS 13.2.2 indeed show the camera actively working in the background, the issue doesn’t appear to affect iOS 13.1.3. We further noticed the issue only occurs if you have given the Facebook app access to your camera. If not, it appears the Facebook app tries to access it, but iOS blocks the attempt.”
How rare it is that iOS security actually comes through and helps, but it appears to be the case here.
Looking at this from a security and compliance perspective, though, is maddening. Regardless of Facebook’s intent here, the situation is allowing the videocamera on the phone or tablet to come alive at any point and start capturing what is on the screen and where the fingers are positioned. What if the employee is working on an ultra-sensitive acquisition memo at that moment? The obvious problem is what happens if Facebook is breached and that particular video segment winds up on the dark web for thieves to purchase? Want to try explaining that to your CISO, the CEO or the board?
Even worse, what if this isn’t an instance of a Facebook security breach? What if a thief sniffs the communication as it travels from your employee’s phone to Facebook? One can hope that Facebook security is fairly robust, but this situation permits the data to be intercepted enroute.
Another scenario: What if the mobile device is stolen? Let’s say that the employee properly created the document on a corporate server accessed via a good VPN. By video-capturing the data while typing, it bypasses all security mechanisms. The thief can now potentially access that video, which offers images of the memo.
What if that employee downloaded a virus that shares all phone content with the thief? Again, the data is out.
There needs to be a way for the phone to always flash an alert whenever an app attempts access and a way to shut it down before it happens. Until then, CISOs are unlikely to sleep well.
On the Android bug, other than accessing the phone in a highly naughty way, the problem is very different. Security researchers at CheckMarx published a report that made it clear how attackers could sidestep all security mechanisms and take over the camera at will.
“After a detailed analysis of the Google Camera app, our team found that by manipulating specific actions and intents, an attacker can control the app to take photos and/or record videos through a rogue application that has no permissions to do so. Additionally, we found that certain attack scenarios enable malicious actors to circumvent various storage permission policies, giving them access to stored videos and photos, as well as GPS metadata embedded in photos, to locate the user by taking a photo or video and parsing the proper EXIF data.This same technique also applied to Samsung’s Camera app,” the report said. “In doing so, our researchers determined a way to enable a rogue application to force the camera apps to take photos and record video, even if the phone is locked or the screen is turned off. Our researchers could do the same even when a user was is in the middle of a voice call.”
The report drills into the specifics of the attack approach.
“It is known that Android camera applications usually store their photos and videos on the SD card. Since photos and videos are sensitive user information, in order for an application to access them, it needs special permissions: storage permissions. Unfortunately, storage permissions are very broad and these permissions give access to the entire SD card. There are a large number of applications, with legitimate use-cases, that request access to this storage, yet have no special interest in photos or videos. In fact, it’s one of the most common requested permissions observed. This means that a rogue application can take photos and/or videos without specific camera permissions, and it only needs storage permissions to take things a step further and fetch photos and videos after being taken. Additionally, if the location is enabled in the camera app, the rogue application also has a way to access the current GPS position of the phone and user,” the report noted. “Of course, a video also contains sound. It was interesting to prove that a video could be initiated during a voice call. We could easily record the receiver’s voice during the call and we could record the caller’s voice as well.”
And yes, more details make this even more frightening: “When the client starts the app, it essentially creates a persistent connection back to the C&C server and waits for commands and instructions from the attacker, who is operating the C&C server’s console from anywhere in the world. Even closing the app does not terminate the persistent connection.”
In short, these two incidents illustrate stunning security and privacy holes within a huge percentage of smartphones today. Whether IT owns these phones or the devices are BYOD (owned by the employee) makes little difference here. Anything created on that device can be easily stolen. And given that a rapidly increasing percentage of all enterprise data is moving to mobile devices, this needs to be fixed and fixed yesterday.
If Google and Apple won’t fix this — given that it’s unlikely to impact sales, since both iOS and Android have these holes, neither Google nor Apple has much financial incentive to act quickly — CISOs must consider direct action. Creating a homegrown app (or convincing a major ISV to do it for everyone) that will impose its own restrictions might be the only viable route.