📗 Date: 23 Feb, 2024
Source: Security Week

A high-severity vulnerability in the Apple Shortcuts application could allow attackers to access sensitive information without prompting the user.

The issue, tracked as CVE-2024-23204 and impacting both iOS and macOS users, could only be triggered with certain actions, but allows attackers to bypass Apple’s framework governing access to sensitive user information and system resources, cybersecurity firm Bitdefender explains.

The issue, the company says, is related to the Shortcuts background process and can bypass Transparency, Consent, and Control (TCC), which ensures that applications cannot access certain sensitive information unless the user explicitly grants permissions.

Providing hundreds of built-in actions, Apple Shortcuts is an automation app that enables users to streamline tasks on both iOS and macOS, through personalized workflows for file management, education, smart home integration, and more.

According to Bitdefender, the vulnerability made it possible for the Shortcuts background process to access some sensitive data even if in a sandbox.

By using an ‘Expand URL’ function in a shortcut, the cybersecurity firm was able to bypass the TCC and transmit the base64-encoded data of a photo to a remote website.

“The method involves selecting any sensitive data (Photos, Contacts, Files and Clipboard Data) within Shortcuts, importing it, converting it using the base64 encode option, and ultimately forwarding it to the malicious server,” Bitdefender notes.

An attacker could then use a Flask program to capture the transmitted data to collect the sensitive information for future exploitation.

Apple allows users to export and share Shortcuts, and attackers could abuse this feature to disseminate shortcuts that are vulnerable to CVE-2024-23204 and target users that install them.

The vulnerability was addressed in January with the release of iOS 17.3 and iPadOS 17.3, and macOS Sonoma 14.3.

“A shortcut may be able to use sensitive data with certain actions without prompting the user,” Apple noted.

Apple said it resolved the issue with additional permission checks. Users are advised to install the latest iOS and macOS patches as soon as possible.

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