BaseFortify

Executive Summary

This vulnerability is a heap-based buffer overflow in the Affinity by Canva macOS application before version 3.3.1. It occurs when the app incorrectly calculates image buffer sizes for QuickLook thumbnails and previews of Affinity document files, leading to an integer overflow and subsequent memory corruption.

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Detection Guidance

This vulnerability involves an integer overflow and heap-based buffer overflow in the Affinity by Canva macOS application before version 3.3.1 when processing Affinity document files for QuickLook thumbnails or previews. Detection requires checking the installed version of the Affinity application and monitoring for crashes in the QuickLook extension when handling Affinity files.

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Impact Analysis

A threat actor could exploit this by creating a malicious Affinity document. When a user views or previews the file in Finder, the vulnerability could crash the thumbnail or preview extension, potentially allowing arbitrary code execution or denial of service on the affected system.

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Compliance Impact

This vulnerability could potentially impact compliance with GDPR and HIPAA by exposing systems to memory corruption attacks that may lead to unauthorized data access or processing. A heap-based buffer overflow might allow attackers to manipulate memory, potentially bypassing security controls or accessing sensitive data during thumbnail or preview generation.

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Mitigation Strategies

Update the Affinity by Canva application for macOS to version 3.3.1 or later to address the integer overflow and buffer overflow issues in QuickLook thumbnail generation.

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