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CVE-2024-27821 is a path handling vulnerability in Apple platforms that affects iOS, iPadOS, macOS, and watchOS. Apple states that the issue was caused by improper path validation and was corrected through improved validation logic. A maliciously crafted shortcut could cause the Shortcuts functionality to output sensitive user data without user consent. The vulnerability is consistent with improper limitation or validation of a pathname, allowing shortcut processing to access or expose data outside the intended scope.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository contains a proof-of-concept (PoC) exploit for CVE-2024-27821, a vulnerability in Apple's WorkflowKit (Shortcuts) on macOS. The exploit demonstrates a race condition that allows a malicious local application to intercept and replace a shortcut being signed or imported by the user. The attacker prepares a malicious unsigned shortcut file and, by manipulating symlinks and directory structures in the Shortcuts temporary directory, swaps the legitimate shortcut with the attacker's file at a critical moment during the signing or import process. The repository includes two main Objective-C files: 'main.m' (demonstrating the import interception) and 'SignedShortcutGenerationInterception-poc.m' (demonstrating the signing interception). Both files implement similar logic to exploit the race condition. The exploit requires local access and the ability to run code on the target system. No network endpoints are involved; the attack is purely local and targets file system operations. The Makefile provides build instructions for the PoC binaries. The README.md provides a brief description and a link to a detailed writeup.
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