iOS 10.3 Fixes Exploit That Caused iPhones to Repeatedly Dial 911

iOS 10.3, released earlier this week, fixes a major vulnerability that could cause iPhones to repeatedly dial 911, reports The Wall Street Journal. In the United States, 911 is an emergency telephone number that summons police, fire, and EMS services.

The 911 security flaw surfaced in October after an 18-year-old iOS developer in Arizona discovered and published code that would cause an iPhone to dial 911 over and over again. The teenager was arrested after the 911 system in Surprise, Arizona was overwhelmed with more than 100 hang-up calls in just minutes.

iphonelinkcall
Because the code was published online, thousands of accidental 911 calls were placed across the United States, demonstrating an effective cyberattack method that could severely disrupt emergency services.

The code exploited an iPhone feature that allows users to click on a phone number in a text message or on a webpage and immediately dial that number. With the iOS 10.3 update, iPhones always require secondary confirmation before automatically calling a number using that method.

Apple says the update supersedes that capability and now requires users to always press a second confirmation before initiating a call.

Apple says it initially worked with app developers to fix the vulnerability, and this update will now prevent it from happening even on apps that hadn't already fixed the issue.

iOS 10.3, which introduces features like Find My AirPods and a new Apple Filesystem, also includes dozens of major security fixes. Another major iOS 10.3 bug fix, which could result in endless Safari pop-ups that "locked" the Safari app, was outlined earlier this week.

Related Forum: iOS 10

Popular Stories

ios 18 4 carplay

Apple Upgrades CarPlay in Two Ways

Wednesday March 12, 2025 6:05 am PDT by
The upcoming iOS 18.4 update for the iPhone includes a smaller but meaningful improvement for Apple's in-car iPhone mirroring system CarPlay. Specifically, CarPlay now shows a third row of icons, up from two rows previously. However, this change is only visible in vehicles with a larger center display. For example, a MacRumors Forums member noticed the change in a Toyota Tundra with a...
Apple More Personal Siri Ad

John Gruber Says 'Something is Rotten' at Apple

Wednesday March 12, 2025 7:39 pm PDT by
Daring Fireball's John Gruber today shared some strongly-worded comments about Apple's delayed personalized Siri features. Gruber is a well-known Apple pundit who has been writing about the company for more than two decades. In a blog post titled "Something Is Rotten in the State of Cupertino," Gruber said Apple's credibility has been "damaged" by the delay:Keynote by keynote, product by...
Apple Maps vs Google Maps Feature

iOS 18.4 Adds a Highly-Requested Setting to iPhones — But Not in U.S.

Wednesday March 12, 2025 1:05 pm PDT by
iPhones are finally getting a much-requested setting, but availability is limited. The upcoming iOS 18.4 update introduces an option to set a default navigation app, other than Apple Maps, but unfortunately this new setting is limited to users in the EU. There, you can now set an app like Google Maps or Waze as your default navigation app on the iPhone by opening the Settings app and tapping ...
airpods pro 2 gradient

AirPods Pro 3 Launch Now Just Months Away: Here's What We Know

Tuesday March 11, 2025 3:26 am PDT by
Despite being released over two years ago, Apple's AirPods Pro 2 continue to dominate the wireless earbud market. However, with the AirPods Pro 3 expected to launch in 2025, anyone thinking of buying Apple's premium earbuds may be wondering if the next generation is worth holding out for. Apart from their audio and noise-canceling performance, which are generally regarded as excellent for...
Generic iOS 19 Feature Mock Light

iOS 19 Will Bring Biggest Design Overhaul Since iOS 7

Monday March 10, 2025 12:17 pm PDT by
Apple is planning for a major design overhaul of the iPhone, iPad, and Mac interfaces with the introduction of iOS 19, iPadOS 19, and macOS 16 later this year, reports Bloomberg. The update will "fundamentally change" the look of Apple's operating system, introducing a more consistent cross-platform experience. Apple plans to update the style of icons, menus, apps, windows, and system...
iPhone 17 Pro Render Front Page Tech

iPhone 17 Pro Machined Parts Leak Reflects Camera Redesign Rumors

Thursday March 13, 2025 3:07 am PDT by
Apple's upcoming iPhone 17 Pro models are expected to feature a significant design overhaul, and a new image apparently taken on an assembly line for the unreleased devices appears to confirm the biggest rumored change. Render of an iPhone 17 Pro model shared by Jon Prosser The iPhone 17 Pro and iPhone 17 Pro Max are rumored to adopt a horizontal camera bar reminiscent of Google's Pixel...
Sad Siri Feature

Kuo: Apple Knows Apple Intelligence is 'Underwhelming' and Won't Drive iPhone Upgrades

Thursday March 13, 2025 9:32 am PDT by
The Apple Intelligence features that Apple introduced with iOS 18 are not pushing people to upgrade their iPhones, Apple analyst Ming-Chi Kuo reiterated today. Apple's recent Siri failures are also going to have an impact on 2025 iPhone shipments, which the market is beginning to realize. As early as last July, Kuo said expectations that Apple Intelligence could drive iPhone upgrades were...
iOS 18

12 New Things Your iPhone Can Do in iOS 18.4

Monday March 10, 2025 9:28 am PDT by
Apple is set to release iOS 18.4 in early April, bringing further refinements to Apple Intelligence features, a neat new capability to iPhone 15 Pro devices, new emoji, and more. While not quite as packed with new features as Apple's preceding iOS 18 point releases, iOS 18.4 still introduces enhancements that aim to make your iPhone smarter and more intuitive. Below, we've listed 12 new...
macOS 16 visionOS Inspired

Major macOS 16 Redesign to Bring Biggest Changes Since Big Sur

Wednesday March 12, 2025 2:28 am PDT by
Apple is planning a radical redesign of macOS with version 16, and it could be the most significant visual refresh since macOS Big Sur was introduced in 2020, according to Bloomberg. MacRumors concept render The upcoming Mac operating system will reportedly be part of Apple's sweeping effort to create a more consistent interface across all of its platforms, including iPhone, iPad, and Apple...

Top Rated Comments

cicalinarrot Avatar
104 months ago
I'd feel much more comfortable with a phone that explodes.
Well, if you have both an iPhone and a Galaxy Note 7, the iPhone can call the police for you when the Note explodes.
Score: 9 Votes (Like | Disagree)
l00pback Avatar
104 months ago
It would be really nice if these articles could offer more accurate regional details.

Enhanced 911 is currently deployed in most metropolitan areas in the United States, Canada, and Mexico as well as all of the Cayman Islands. Also, Davao City in the Philippines.
This site is for news and rumors about Apple-related products and services. It's not Wikipedia.
Score: 5 Votes (Like | Disagree)
sudo1996 Avatar
104 months ago
There was a very unfortunate case recently in the Dallas area where a child died when 911 couldn't be reached due to massive #'s of calls being made in to the system and it couldn't keep up. Hold times for 911 response were at times as much as 45 mim... Related?
There's a vulnerability in Android systems that allows unprivileged apps to spoof the cellular ID that the phone uses to identify itself on the LTE network, plus Android lets those apps make phone calls. And there's a vulnerability in LTE systems where someone can spoof a bunch of random cell IDs with fake security keys that the carrier won't check IFF they're requesting a 911 call; in fact, that phone doesn't even need to be a subscriber to that carrier. And the 911 systems have no way of telling which calls are legitimate. So it could be that.

The worst part? Even if they fix this in Android,
1. Attackers can still get away with using their own devices, and any kind of fix for this on the LTE network would require phones to be updated so they can make legit 911 calls...
2. Nobody updates their Android phones.
[doublepost=1490914369][/doublepost]
It would be really nice if these articles could offer more accurate regional details. There seems to be a huge focus on the US, maybe because the publication is based out of the US? Remember that you are reaching a global audience.

Enhanced 911 is currently deployed in most metropolitan areas in the United States, Canada, and Mexico as well as all of the Cayman Islands. Also, Davao City in the Philippines.

Knowing that this 911 bug happened elsewhere, not just the US, broadens how many people and countries that it may have impacted.
The article should really say that this bug has nothing to do with 911 and is just an exploit to force the iPhone to call any number, regardless of your service provider.
Score: 4 Votes (Like | Disagree)
thisisnotmyname Avatar
104 months ago
The article is unclear, was he arrested for publishing the vulnerability or did he exploit it himself to DoS the 911 system?
Score: 4 Votes (Like | Disagree)
6foot5foot Avatar
104 months ago
That's what I want to know too, my iPhone 6 is running fine on iOS 9.3.5, I doubt jumping to 10 will do anything but slow it down and create bugs, of course, I will be happy to be told otherwise.
I think it's a superb idea to stay with an outdated OS, leaving yourself wide open to security exploits and vulnerable... I'd advise ANYONE to do this, and whilst you're about it, go and open your front door, leave it wide open when you go to bed, and then I would post ALL your personal and financial details, website & app logins to pastebin and put them on Twitter - may as well go all out. Next, install "TeamViewer" and call any "Indian Microsoft agents" you can find by Googling that phrase, and give them your TeamViewer ID, then naively hope they're honest and won't ruin your computer.

Yes, security updates and stability patches are for mugs - be scared and cautious and stay out of date, that's the spirit, and I am sure Steve Gibson of GRC.com will advise you of the same.

I won't add the redundant "sarcasm" tag, I think you got the point.


PS: Would you like some FREE flash drives? Let me know what OS you and your friends are running, and I'll send you as many as you like :p

PS!

Please accept my gift of a free gold mercedes, shipped direct to your door for a small £100 admin fee, by clicking here:

http://adf.ly/genuinefreegoldmercedescars ('http://http://adf.ly/genuinefreegoldmercedescars')

Score: 4 Votes (Like | Disagree)
Analog Kid Avatar
104 months ago
I read about this a while ago. To be clear, this vulnerability didn't just affect 911 calls. You could force the iPhone to make a call to any number.
Nice. So he didn't have to attack critical emergency services, he just chose to do so?

"To show the seriousness" he aimed at 911. Basically, "let me hurt innocent people so you understand this could seriously hurt innocent people".

Thinking about the connection between actions and consequence is what jail is for, after all...
Score: 3 Votes (Like | Disagree)