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Zhuowei Zhang shared the project via Twitter. He calls it a "proof of concept app."
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Zhang claims that the app he created uses the CVE-20222-46689 exploit overwriting the default iOS font
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To allow users to customize the system's appearance using a font other than San Francisco.
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CVE-2022-46689 is an exploit that affects iOS 16.1.2 and earlier versions of the operating systems.
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It allows apps to execute arbitrary code with kernel privileges.
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iOS 16.2 fixed the exploit and many other security flaws in previous versions of iOS.
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The fonts iOS uses are limited, so the developer used only a few fonts for the experiment, such as DejaVu Sans Condensed and Serif.
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If you were wondering, Choco Cooky was the strange font that used to be pre-installed on Samsung smartphones.
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It's now possible to have it on your iPhone. Zhang explained that this process is safe as all changes can be reversed once the device has been rebooted.
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The developer suggests that users download the app and back up their devices before changing the default font.
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The change will only affect certain text in iOS, as other parts of iOS use different fonts.