CVE-2020-9891: 
macOS vulnerability analysis and mitigation

CVE-2020-9891 is an out-of-bounds read vulnerability discovered in Apple's audio processing components. The vulnerability was disclosed and patched in July 2020, affecting multiple Apple operating systems including iOS 13.6, iPadOS 13.6, macOS Catalina 10.15.6, tvOS 13.4.8, and watchOS 6.2.8. The vulnerability was discovered by JunDong Xie and XingWei Lin of Ant-Financial Light-Year Security Lab (Apple Support).

The vulnerability is classified as an out-of-bounds read issue in the audio processing component that was addressed with improved bounds checking. The vulnerability has a CVSS v3.1 Base Score of 7.8 (HIGH) with the vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H (NVD).

When exploited, processing a maliciously crafted audio file may lead to arbitrary code execution on the affected system. This could potentially allow attackers to execute malicious code with elevated privileges (Apple Support).

The vulnerability requires user interaction, specifically processing a maliciously crafted audio file. The attack complexity is considered low, and no special privileges are required to execute the attack (NVD).

Apple has addressed this vulnerability by implementing improved bounds checking in the following software updates: iOS 13.6 and iPadOS 13.6, macOS Catalina 10.15.6, tvOS 13.4.8, and watchOS 6.2.8. Users are advised to update their devices to these versions or later to mitigate the vulnerability (Apple Support).