A new bug facing the iOS Mail app was found recently by security specialist Jan Soucek (via The Register). The malicious bug is capable of delivering false iCloud log-in prompts by allowing remote HTML content to be loaded through an email message delivered to the intended victim. The bug then delivers a convincing iCloud log-in box for users to re-enter their Apple ID and password. Soucek says that Apple did not respond to his discovery of the bug when he stumbled across it back in January.


"Back in January 2015 I stumbled upon a bug in iOS's mail client, resulting in HTML tag in e-mail messages not being ignored. This bug allows remote HTML content to be loaded, replacing the content of the original e-mail message. JavaScript is disabled in this UIWebView, but it is still possible to build a functional password "collector" using simple HTML and CSS."

The bug isn't relegated to only iCloud phishing attacks, however, letting anyone with access to it customize the attack to ask for whichever username and password credentials they feel the need for. Soucek kept the details of the bug only between himself and Apple, letting the company have time to possibly fix the attack and inform him of its progress. Given the company's remaining quietness on the subject, he decided to publish the proof of concept - called the Mail.app inject kit - on GitHub in hopes of spreading its awareness.

"It was filed under Radar #19479280 back in January, but the fix was not delivered in any of the iOS updates following 8.1.2. Therefore I decided to publish the proof of concept code here."

While Soucek's actions bring the malicious bug to more people's attentions and can help stop it in due time, it also means there's a wider chance for phishers to deploy it on their own. Until Apple comments on the story and offers a fix for the bug, it'll be safest to take precaution when any password prompt emerges while browsing email in iOS.

Related Forum: iOS 8

Top Rated Comments

laurim Avatar
129 months ago
I've been having issues with repeated requests to log into iCloud for a while so if this happened while I was in Mail, I wouldn't know if it were simply more of the same or a malicious one via Mail itself. You people on here being so smug talking smack about your wives being so dumb need to stop before you embarrass yourself. well, too late but I mean after you also fall for it. This is different than falling for a regular phishing email .
Score: 11 Votes (Like | Disagree)
tigres Avatar
129 months ago
Splendid... My wife would fall for that.
Score: 6 Votes (Like | Disagree)
nagromme Avatar
129 months ago
Will the fake dialog swipe/scroll when you scroll the email? If so, that's a quick check as a defensive stopgap for those who want to watch out for this. A real dialog would be stuck to the screen and not move when you scroll.
Score: 6 Votes (Like | Disagree)
avanpelt Avatar
129 months ago
Turn two factor authentication or app-specific passwords on (or both) and this will not be a problem. Though obviously it is something that Apple needs to fix.
Score: 5 Votes (Like | Disagree)
C DM Avatar
129 months ago
That's not something Apple can control without removing features from Mail that exist in literally every modern e-mail client. Essentially what is happening here is Mail is rendering a website. It's a very small website and it's been designed to look like Apple's UI to trick you.

So here are Apple's options:


* They could disable HTML / CSS completely, and push Mail back into the dark ages.
* They could offer a toggle to disable HTML / CSS in Mail, which few people would use and would cause unexpected issues when a valid e-mail requires HTML / CSS to render.
* They could disable specific HTML like FORMS, which would prevent this particular scam but again, cause unexpected issues when a valid e-mail has a valid form.
* They could scan the email for specific html like FORMS and provide a notice/alert that the email might be attempting to steal passwords. This is probably the best scenario but even so it would scare users away from legitimate emails using forms (which granted, are very few)

But again... this e-mail would look the same and FUNCTION the same whether you viewed it on iOS, or OS X, or Windows, or via Safari or Chrome or Opera... whether you loaded the email from Mail.app or via iCloud or Gmail or Outlook or any other email client.

And any "fix" Apple takes on its end is really only a bandage. It wouldn't prevent this phishing email from functioning on other e-mail clients and any "fix" they offer has downsides as listed above.

It's not an exploit. It's not a bug. It's not something that can only affect iOS users outside that it vaguely looks like the iOS environment. It's not a "Meta tag issue" or the result of some faulty programming on the part of Apple's iOS development team.
Perhaps if Apple's own prompts to ask for iCloud passwords here and there weren't as common or secured in some way to clearly be unique to an actual valid system prompt then things of this nature wouldn't have as much potential of being abused.
You haven't checked the link, have you? https://github.com/jansoucek/iOS-Mail.app-inject-kit
It is a meta tag issue, and your four bullets above wouldn't do anything to stop it. The email doesn't have a form, the email redirects the user to a webpage (within the mail client) that has a form. Big difference. And as the person has described, it doesn't work the same way in all mail clients, as others wouldn't follow the meta refresh.
Go read up, then come back and change your mind.
And then there's that.
Score: 4 Votes (Like | Disagree)
mw360 Avatar
129 months ago
Perhaps if Apple's own prompts to ask for iCloud passwords here and there weren't as common or secured in some way to clearly be unique to an actual valid system prompt then things of this nature wouldn't have as much potential of being abused.
I posted a good while ago about exactly this problem. Of my four iCloud enabled devices I must get at least one spurious iCloud password prompt per day (although some periods are worse than others). It seems to be either iMessage and its eternal struggle to get a ****ing grip, or FaceTime, or some other cluster that's gone off behind the scenes. And these prompts are rarely related to me actually trying to so something iCloud related. Just turn on the iPhone, and 'enter your iCloud password'. Apple don't even say why, just training us, like good little dupes, to hand it over whenever some plain white box asks for it.
Score: 3 Votes (Like | Disagree)

Popular Stories

iphone 16 display

iPhone 17's Scratch Resistant Anti-Reflective Display Coating Canceled

Monday April 28, 2025 12:48 pm PDT by
Apple may have canceled the super scratch resistant anti-reflective display coating that it planned to use for the iPhone 17 Pro models, according to a source with reliable information that spoke to MacRumors. Last spring, Weibo leaker Instant Digital suggested Apple was working on a new anti-reflective display layer that was more scratch resistant than the Ceramic Shield. We haven't heard...
iPhone 17 Air Pastel Feature

iPhone 17 Reaches Key Milestone Ahead of Mass Production

Monday April 28, 2025 8:44 am PDT by
Apple has completed Engineering Validation Testing (EVT) for at least one iPhone 17 model, according to a paywalled preview of an upcoming DigiTimes report. iPhone 17 Air mockup based on rumored design The EVT stage involves Apple testing iPhone 17 prototypes to ensure the hardware works as expected. There are still DVT (Design Validation Test) and PVT (Production Validation Test) stages to...
Beyond iPhone 13 Better Blue

20th Anniversary iPhone Likely to Be Made in China Due to 'Extraordinarily Complex' Design

Monday April 28, 2025 4:29 am PDT by
Apple will likely manufacture its 20th anniversary iPhone models in China, despite broader efforts to shift production to India, according to Bloomberg's Mark Gurman. In 2027, Apple is planning a "major shake-up" for the iPhone lineup to mark two decades since the original model launched. Gurman's previous reporting indicates the company will introduce a foldable iPhone alongside a "bold"...
apple watch ultra yellow

What's Next for the Apple Watch Ultra 3 and Apple Watch SE 3

Friday April 25, 2025 2:44 pm PDT by
This week marks the 10th anniversary of the Apple Watch, which launched on April 24, 2015. Yesterday, we recapped features rumored for the Apple Watch Series 11, but since 2015, the Apple Watch has also branched out into the Apple Watch Ultra and the Apple Watch SE, so we thought we'd take a look at what's next for those product lines, too. 2025 Apple Watch Ultra 3 Apple didn't update the...
iphone 17 air iphone 16 pro

iPhone 17 Air USB-C Port May Have This Unusual Design Quirk

Wednesday April 30, 2025 3:59 am PDT by
Apple is preparing to launch a dramatically thinner iPhone this September, and if recent leaks are anything to go by, the so-called iPhone 17 Air could boast one of the most radical design shifts in recent years. iPhone 17 Air dummy model alongside iPhone 16 Pro (credit: AppleTrack) At just 5.5mm thick (excluding a slightly raised camera bump), the 6.6-inch iPhone 17 Air is expected to become ...
iPhone 17 Pro Blue Feature Tighter Crop

iPhone 17 Pro Launching Later This Year With These 13 New Features

Wednesday April 23, 2025 8:31 am PDT by
While the iPhone 17 Pro and iPhone 17 Pro Max are not expected to launch until September, there are already plenty of rumors about the devices. Below, we recap key changes rumored for the iPhone 17 Pro models as of April 2025: Aluminum frame: iPhone 17 Pro models are rumored to have an aluminum frame, whereas the iPhone 15 Pro and iPhone 16 Pro models have a titanium frame, and the iPhone ...
iPhone 17 Pro on Desk Feature

All iPhone 17 Models Again Rumored to Feature 12GB of RAM

Tuesday April 29, 2025 3:36 am PDT by
All upcoming iPhone 17 models will come equipped with 12GB of RAM to support Apple Intelligence, according to the Weibo-based leaker Digital Chat Station. The claim from the Chinese leaker, who has sources within Apple's supply chain, comes a few days after industry analyst Ming-Chi Kuo said that the iPhone 17 Air, iPhone 17 Pro, and iPhone 17 Pro Max will all be equipped with 12GB of RAM. ...
AirPods Pro 3 Mock Feature

AirPods Pro 3 Just Months Away – Here's What We Know

Tuesday April 29, 2025 1:30 am PDT by
Despite being more than two years old, Apple's AirPods Pro 2 still dominate the premium wireless‑earbud space, thanks to a potent mix of top‑tier audio, class‑leading noise cancellation, and Apple's habit of delivering major new features through software updates. With AirPods Pro 3 widely expected to arrive in 2025, prospective buyers now face a familiar dilemma: snap up the proven...