New Mac Exploit Easily Bypasses Gatekeeper Security, Could Allow Installation of Malicious Apps

Apple introduced Gatekeeper in 2012, creating it as a method of protection for users against malicious threats by adding various layers of security during installation of Mac apps. The feature is intended to ensure that apps users try to install on their Macs are legitimate and signed by a registered developer, minimizing the threat of malware. But now, a security researcher has discovered a simple method of bypassing Gatekeeper using a binary file already trusted by Apple to attack a user's computer (via Ars Technica).

macbook_pro_15_imac_27
Gatekeeper is meant solely to check the initial digital certificate when an app is downloaded on a Mac, ensuring that the program has been signed by an Apple-approved developer or at least comes from the Mac App Store itself before allowing the installation to proceed.

"If the application is valid—so it was signed by a developer ID or was (downloaded) from the Mac App Store—Gatekeeper basically says 'OK, I'm going to let this run,' and then Gatekeeper essentially exits," Patrick Wardle, director of research of security firm Synack, told Ars. "It doesn't monitor what that application is doing. If that application turns around and either loads or executes other content from the same directory... Gatekeeper does not examine those files."

Even if Gatekeeper is enhanced to its highest level of security settings, the new exploit can take advantage of a computer. Once the trusted file makes its way past the security program, it can then execute a handful of other malicious programs attached with the rest of the installation and gains the ability to install malicious software such as password-stealing programs, apps that can capture audio and video from a Mac's camera, and botnet software.

The researcher who discovered the exploit sent news of it to Apple about 60 days ago and "believes they are working on a way to fix the underlying cause or at least lessen the damage it can do to end users." Since then, an Apple spokesperson has confirmed the company is working on a patch for the issue and has asked that the identities of the specific files used in the exploit not be disclosed. Wardle plans to showcase his research on the Gatekeeper exploit at the Virus Bulletin Conference on Thursday in Prague.

Popular Stories

iPhone 17 Pro in Hand Feature Lowgo

iPhone 17 Pro to Reverse iPhone X Design Decision

Monday July 7, 2025 9:46 am PDT by
Since the iPhone X in 2017, all of Apple's highest-end iPhone models have featured either stainless steel or titanium frames, but it has now been rumored that this design decision will be coming to an end with the iPhone 17 Pro models later this year. In a post on Chinese social media platform Weibo today, the account Instant Digital said that the iPhone 17 Pro models will have an aluminum...
iphone 16 pro models 1

Here's How the iPhone 17 Pro Max Will Compare to the iPhone 17 Pro

Saturday July 5, 2025 1:00 pm PDT by
Apple should unveil the iPhone 17 series in September, and there might be one bigger difference between the Pro and Pro Max models this year. As always, the Pro Max model will be larger than the Pro model:iPhone 17 Pro: 6.3-inch display iPhone 17 Pro Max: 6.9-inch displayGiven the Pro Max is physically larger than the Pro, it has more internal space, allowing for a larger battery and...
iOS 26 Feature

Everything New in iOS 26 Beta 3

Monday July 7, 2025 1:20 pm PDT by
Apple is continuing to refine and update iOS 26, and beta three features smaller changes than we saw in beta 2, plus further tweaks to the Liquid Glass design. Apple is gearing up for the next phase of beta testing, and the company has promised that a public beta is set to come out in July. Transparency In some apps like Apple Music, Podcasts, and the App Store, Apple has toned down the...
imac video apple feature

Apple Launching These 15+ Products Later This Year

Sunday July 6, 2025 8:05 am PDT by
The calendar has turned to July, meaning that 2025 is now more than half over. And while the summer months are often quiet for Apple, the company still has more than a dozen products coming later this year, according to rumors. Below, we have outlined at least 15 new Apple products that are expected to launch later this year, along with key rumored features for each. iPhone 17 Series iPho...
iPhone Car Key Kia

Here's Which Vehicles Offer iPhone Car Keys

Sunday July 6, 2025 3:03 pm PDT by
In 2020, Apple added a digital car key feature to its Wallet app, allowing users to lock, unlock, and start a compatible vehicle with an iPhone or Apple Watch. The feature is currently offered by select automakers, including Audi, BMW, Hyundai, Kia, Genesis, Mercedes-Benz, Volvo, and a handful of others, and it is set to expand further. Apple has a web page with a list of vehicle models that ...
iPhone 17 Pro in Hand Feature Lowgo

iPhone 17 Pro Coming Soon With These 14 New Features

Friday July 4, 2025 1:05 pm PDT by
Apple's next-generation iPhone 17 Pro and iPhone 17 Pro Max are just over two months away, and there are plenty of rumors about the devices. Below, we recap key changes rumored for the iPhone 17 Pro models. Latest Rumors These rumors surfaced in June and July:Apple logo repositioned: Apple's logo may have a lower position on the back of the iPhone 17 Pro models, compared to previous...
iphone 17 pro render majin bu

New iPhone 17 Pro Renders Highlight Apple Logo and MagSafe Design Changes

Sunday July 6, 2025 8:43 pm PDT by
New renders today provide the best look yet relocated Apple logo and redesigned MagSafe magnet array of the iPhone 17 Pro and iPhone 17 Pro Max. Image via Majin Bu. Several of the design changes coming to the iPhone 17 Pro model have been rumored for some time, such as the elongated camera bump that spans the full width of the device, with the LiDAR Scanner and flash moving to the right side. ...
iPhone 14 Pro Dynamic Island

iPhone 17 Models Rumored to Feature Redesigned Dynamic Island

Monday July 7, 2025 7:38 am PDT by
iPhone 17 models will feature a redesigned Dynamic Island user interface, according to a post today from Digital Chat Station, an account with more than three million followers on Chinese social media platform Weibo. The account has accurately leaked some information regarding future Apple products in the past. The account did not share any specific details about the alleged changes that are ...

Top Rated Comments

Codyak Avatar
128 months ago
-Gategate
Score: 20 Votes (Like | Disagree)
cariacou Avatar
128 months ago
Your Mac has either a 14nm Samsung CPU or a 16nm TSMC CPU.

To check which one you have, please click on this link...
Score: 13 Votes (Like | Disagree)
DavidTheExpert Avatar
128 months ago
There's a very simple way to avoid malware on any computer: Don't install anything you don't trust.
Score: 6 Votes (Like | Disagree)
garylapointe Avatar
128 months ago
I tend to assume that there are ways around all forms of security protection.
But the app store has always made me feel a little safer...

Gary
Score: 4 Votes (Like | Disagree)
Lord Hamsa Avatar
128 months ago
I'm not particularly concerned about this "exploit". Anyone seeking to make use of it could just as easily put the malware directly in the developer-signed application in the first place. Why go through the extra steps of invoking additional applications when you can do it in the initial one?

The only thing that keeps the self-signed applications on the up-and-up is that the developer ID can be revoked for bad behavior - whether it's in the signed application or a bundled application called by it makes little difference if the developer is doing this intentionally.

The only real attack vector here is if an application is known to invoke "helper" executables, and someone executes a man-in-the-middle attack to create a modified distribution with the legit signed main application but with one or malware-infected helper executables, and then pass that off as a legit bundle. Possible, but limiting downloads to trusted/official sites will prevent that.
Score: 4 Votes (Like | Disagree)
JimmyHook Avatar
128 months ago
This is an old one. The "fix" is to download software from trusted sources only. Which is what you should do anyway. The guy even said it isn't a bug, it's a limitation in gatekeeper.
Score: 3 Votes (Like | Disagree)