CVE-2020-27924: 
macOS vulnerability analysis and mitigation

CVE-2020-27924 is an out-of-bounds read vulnerability discovered in Apple's ImageIO component that affects multiple Apple operating systems including macOS Big Sur, iOS, iPadOS, watchOS, and tvOS. The vulnerability was disclosed and patched in November 2020, with fixes released in macOS Big Sur 11.1, Security Update 2020-001 Catalina, Security Update 2020-007 Mojave, iOS 14.2 and iPadOS 14.2, watchOS 7.1, and tvOS 14.2. The vulnerability was discovered by Lei Sun (Apple Security).

The vulnerability is characterized as an out-of-bounds read issue in the ImageIO component that was addressed by Apple through improved input validation. When processing maliciously crafted images, this vulnerability could be exploited (Apple Security, Apple Security).

If successfully exploited, this vulnerability could lead to arbitrary code execution when processing a maliciously crafted image on affected systems (Apple Security, Apple Security).

Apple addressed this vulnerability by implementing improved input validation in the ImageIO component. Users should update to macOS Big Sur 11.1, Security Update 2020-001 Catalina, Security Update 2020-007 Mojave, iOS 14.2 and iPadOS 14.2, watchOS 7.1, or tvOS 14.2 depending on their device (Apple Security, Apple Security).