In-App Purchase Vulnerability to Be Fixed in iOS 6; Apple Offers Best Practices to Developers

As noticed by 9to5Mac, Apple has offered developers a series of best practices to prevent the In-App Purchase vulnerability, as well as promising a full fix in iOS 6. The advisement was sent to developers in an email today.

NewImage
CNET was issued this statement by Apple:

"We recommend developers follow best practices at developer.apple.com to help ensure they are not vulnerable to fraudulent In-App purchases," Apple spokesperson Tom Neumayr told CNET. "This will also be addressed with iOS 6."

Apple issued this note to developers on the iOS Developer webpage, along with a series of suggestions to help verify that in-app purchases are legitimate:

A vulnerability has been discovered in iOS 5.1 and earlier related to validating in-app purchase receipts by connecting to the App Store server directly from an iOS device. An attacker can alter the DNS table to redirect these requests to a server controlled by the attacker. Using a certificate authority controlled by the attacker and installed on the device by the user, the attacker can issue a SSL certificate that fraudulently identifies the attacker’s server as an App Store server. When this fraudulent server is asked to validate an invalid receipt, it responds as if the receipt were valid.

News of the in-app purchase hack broke a week ago, and Apple has made several attempts to prevent users using the hack. It allows users to avoid paying for in-app purchases by using a third-party server as a "man-in-the-middle" attack. Apple now includes the UDID identifier in in-app purchase receipts in an attempt to increase the security of purchases.

Popular Stories

m1 chip slide

Five Years of Apple Silicon: M1 to M5 Performance Comparison

Monday November 10, 2025 1:08 pm PST by
Today marks the fifth anniversary of the Apple silicon chip that replaced Intel chips in Apple's Mac lineup. The first Apple silicon chip, the M1, was unveiled on November 10, 2020. The M1 debuted in the MacBook Air, Mac mini, and 13-inch MacBook Pro. The M1 chip was impressive when it launched, featuring the "world's fastest CPU core" and industry-leading performance per watt, and it's only ...
iOS 26

iOS 26.2 Available Next Month With These 8 New Features

Tuesday November 11, 2025 9:48 am PST by
Apple released the first iOS 26.2 beta last week. The upcoming update includes a handful of new features and changes on the iPhone, including a new Liquid Glass slider for the Lock Screen's clock, offline lyrics in Apple Music, and more. In a recent press release, Apple confirmed that iOS 26.2 will be released to all users in December, but it did not provide a specific release date....
All Screen iPhone 2027 Feature 1

Apple to Hide Selfie Camera Under Display of 20th Anniversary iPhone

Monday November 10, 2025 1:55 am PST by
Apple will conceal the front-facing camera under the screen of its 2027 iPhone, a Chinese leaker said today, corroborating reports that Apple's 20th anniversary iPhone will have no visible cutouts in the display. Weibo-based account Digital Chat Station said Apple's development of under-screen camera technology was progressing as planned for adoption in 2027, one year after it will...
iphone pocket%402x

Apple Debuts iPhone Pocket, a Limited Edition iPod Sock-Style Accessory

Tuesday November 11, 2025 1:23 am PST by
Apple has teamed up with Japanese fashion house ISSEY MIYAKE to launch iPhone Pocket, a 3D-knitted limited edition accessory designed to carry an iPhone, AirPods, and other everyday items. The accessory is like a stretchy pocket, not unlike an iPod Sock, but elongated to form a strap made of a ribbed, elastic textile that fully encloses an iPhone yet allows you to glimpse the display...
iphone air thinness

iPhone Air Sales Are So Bad That Apple's Delaying the Next-Generation Version

Monday November 10, 2025 11:41 am PST by
The thin, light iPhone Air sold so poorly that Apple has decided to delay the launch of the next-generation iPhone Air that was scheduled to come out alongside the iPhone 18 Pro, reports The Information. Apple initially planned to release a new iPhone Air in fall 2026, but now that's not going to happen. Since the iPhone Air launched in September, there have been reports of poor sales...
homepod mini colors

New HomePod Mini Coming Soon With These Features

Tuesday November 11, 2025 7:30 am PST by
Apple is expected to announce a new HomePod mini imminently, headlining with new chips. Here are all of the new features we're expecting. The second-generation HomePod mini is highly likely to contain a more up-to-date chip for more advanced computational audio and improved responsiveness. The current HomePod mini is equipped with the Apple Watch Series 5's S5 chip from 2019. Apple is likely ...
ios 26 digital id passport wallet

Apple Announces Launch of U.S. Passport Feature in iPhone's Wallet App

Wednesday November 12, 2025 9:15 am PST by
Apple today announced that iPhone users can now create a Digital ID in the Apple Wallet app based on information from their U.S. passport. To create and present a Digital ID based on a U.S. passport, you need: An iPhone 11 or later running iOS 26.1 or later, or an Apple Watch Series 6 or later running watchOS 26.1 or later Face ID or Touch ID and Bluetooth turned on An Apple Account ...
iphone black friday gold

The Best Early Black Friday iPhone Deals

Monday November 10, 2025 10:18 am PST by
Cellular carriers have always offered big savings on the newest iPhone models during the holidays, and Black Friday 2025 sales have kicked off at AT&T, Verizon, T-Mobile, and more. Right now we're tracking notable offers on the iPhone 17, iPhone 17 Pro, iPhone 17 Pro Max, and iPhone Air. For even more savings, keep an eye on older models during the holiday shopping season. Note: MacRumors is...
Early Black Friday Deals 1

The Best Early Black Friday Apple Deals on AirPods, Apple Watch, iPad, and More

Saturday November 8, 2025 6:16 am PST by
We're officially in the month of Black Friday, which will take place on Friday, November 28 in 2025. As always, this will be the best time of the year to shop for great deals, including popular Apple products like AirPods, iPad, Apple Watch, and more. In this article, the majority of the discounts will be found on Amazon. Note: MacRumors is an affiliate partner with some of these vendors. When ...
homepod mini thumb feature

New HomePod Mini, Apple TV, and AirTag Were Expected This Year — Where Are They?

Wednesday November 12, 2025 11:42 am PST by
While it was rumored that Apple planned to release new versions of the HomePod mini, Apple TV, and AirTag this year, it is no longer clear if that will still happen. Back in January, Bloomberg's Mark Gurman said Apple planned to release new HomePod mini and Apple TV models "toward the end of the year," while he at one point expected a new AirTag to launch "around the middle of 2025." Yet,...

Top Rated Comments

ideal.dreams Avatar
174 months ago
I'm so-so on this. I can understand paying in-app for an application you initially downloaded for free, but if you've already paid for an app, why should you have to pay MORE to gain enhancements? I'm all for supporting the developers, believe me, I know that they work hard and it's a steady income for most, but I'm not going to find myself paying additional money for something in an app that I've already paid for to get more from the app.
Score: 6 Votes (Like | Disagree)
WardC Avatar
174 months ago
Apple needs to step in and make in-app purchases illegal altogether...all that stuff is just a ploy and gimmick to make developer's more money. If I am paying for an application, I don't want "half-ass" functionality which requires 10-100x what I paid for the app to get to use all the features. That is just ridiculous!

The way I basically see it, is the in-app purchases (especially games) feed on a user's craving for "more" out of the game. When a user realizes they cannot advance in a game or achieve a goal in the game without the in-app purchase, they will tap a button and charge a fee to their Apple Store account. A few of these "taps" and the user feels comfortable using this feature....and before you know it, they have tacked on $200 in fees for a $2.99 or FREE game download originally. The whole thing feeds on an addictive-nature to get you "hooked" on using the in-app purchases with the game....and it's making developer's bookoos of money. Now that a hacker has circumvented this, devs are crying about it, but the truth of the matter is in-app purchases are an evil, luring, deceptive, scheming beast altogether to sucker the public into forking over their wallets!!!

And that, my friends, is the reason I refuse to download and use apps and games with the in-app purchase feature. It's a gimmick made by *greedy greedy* developer types, and I am not buying into any of that junk, at all. Just not worth it.
Score: 5 Votes (Like | Disagree)
jeckels Avatar
174 months ago
Some of the in-app purchases are just ridiculous but still doesn't mean you should cheat a developer out of money. They need to make a living too.
Score: 5 Votes (Like | Disagree)
charlituna Avatar
174 months ago
Apple needs to step in and make in-app purchases illegal altogether...all that stuff is just a ploy and gimmick to make developer's more money.

It's a free market. I have the power to choose how I develop and sell my IP. If you don't like it, don't buy it. Simple.

And not all IAP use is of this sort, some of it is for removing ads etc. And in some cases the games (which are what commonly use this ploy) are still playable although at a slower rate without playing. Or like Temple Run let you earn in game coins to buy the enhancements
Score: 4 Votes (Like | Disagree)
MrClam Avatar
174 months ago
What i find interesting is that when pirates normally try to justify their actions - they usually use the high price of software as an excuse, and that if prices were cheaper.. They'd stop doing it.

If you're enjoying a developers hard work and not paying for it - then you are stealing that developers time. It'd be akin to going to a barbers - getting a haircut and not paying for it... You've not stolen anything physical from him, but you have stolen his time from him - he gave you a service, you didn't pay.

You can try to justify that however you like, but that barber gave you a service you didnt pay for, and as such you have just stolen from him. Same goes for software development - people spend their time to make something for you to enjoy - if you benefit from it and havent paid for it, that is theft. Pure and simple.

If you worked for your boss for a month, only for him to refuse to pay you at the end of that.. And just laughed it off as "piracy" - how would that make you feel? He's got the benefit of your work but refused to pay you for it.

I put a LOT of time and effort into my software - if i cant put food on the table because people are ripping my work off... then i'll stop doing it.. If everyone did that - then you'd have nothing left to pirate.

I guess that's just the way the self-entitled nature of todays kids are...
Score: 4 Votes (Like | Disagree)
nagromme Avatar
174 months ago
I'm so-so on this. I can understand paying in-app for an application you initially downloaded for free, but if you've already paid for an app, why should you have to pay MORE to gain enhancements? I'm all for supporting the developers, believe me, I know that they work hard and it's a steady income for most, but I'm not going to find myself paying additional money for something in an app that I've already paid for to get more from the app.
How will I pay for making new levels for my game (no, I don’t really have one—right now) if you think all additions should be made free?

Never buy a game that isn’t worth the price you paid, “right out of the box"; reviews will help, and if you get ripped off I fee your pain.

And if the game IS worth what you paid, then there’s no need to get any more value, for free, out of the programmer’s sweat and dreams.

Therefore, buy the add-ons if they’re worth it, skip them if they’re not, but don’t steal them.

Some companies charge absurd prices for their games. Some do that for their IAP. Skip those companies, rather than spreading hacks that hurt everyone.


Apple needs to step in and make in-app purchases illegal altogether...all that stuff is just a ploy and gimmick to make developer's more money. If I am paying for an application, I don't want "half-ass" functionality which requires 10-100x what I paid for the app to get to use all the features. That is just ridiculous!

The way I basically see it, is the in-app purchases (especially games) feed on a user's craving for "more" out of the game. When a user realizes they cannot advance in a game or achieve a goal in the game without the in-app purchase, they will tap a button and charge a fee to their Apple Store account. A few of these "taps" and the user feels comfortable using this feature....and before you know it, they have tacked on $200 in fees for a $2.99 or FREE game download originally. The whole thing feeds on an addictive-nature to get you "hooked" on using the in-app purchases with the game....and it's making developer's bookoos of money. Now that a hacker has circumvented this, devs are crying about it, but the truth of the matter is in-app purchases are an evil, luring, deceptive, scheming beast altogether to sucker the public into forking over their wallets!!!

And that, my friends, is the reason I refuse to download and use apps and games with the in-app purchase feature. It's a gimmick made by *greedy greedy* developer types, and I am not buying into any of that junk, at all. Just not worth it.
You’re making the mistake of assuming that ALL IAP works the same and is a rip-off. It’s not.

And how do you know whether a developer is greedy or not? Maybe they should include all 500 levels in the original $1 game, say, and not just 200. But do we know what it cost him to develop that app and those levels? Do we know what his rent, food and health care cost? Are we asking him to give us more for free than we’d be willing to in his shoes?

I think it’s fair for a developer to set any kind of business model they want, as long as they’re honest about what it is. You can then skip those games that aren’t worth it to you.
Score: 4 Votes (Like | Disagree)