CVE-2024-27876: 
macOS vulnerability analysis and mitigation

A race condition vulnerability (CVE-2024-27876) was discovered in Apple's operating systems, affecting macOS Ventura, iOS, iPadOS, and visionOS. The vulnerability was disclosed on September 16, 2024, and was discovered by security researcher Snoolie Keffaber (@0xilis). The issue affects the Compression component across multiple Apple operating system versions including macOS Ventura 13.7, iOS 17.7, iPadOS 17.7, visionOS 2, iOS 18, iPadOS 18, macOS Sonoma 14.7, and macOS Sequoia 15 (Apple Support, NVD).

The vulnerability is classified as a race condition in the Compression component that was addressed with improved locking mechanisms. The issue has been assigned CWE-362 (Concurrent Execution using Shared Resource with Improper Synchronization). According to the CVSS 3.1 scoring, the vulnerability has received a base score of 5.5 (MEDIUM) from NIST with vector CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N, while CISA-ADP assessed it at 8.1 (HIGH) with vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N (NVD).

When exploited, the vulnerability allows an attacker to write arbitrary files to the system when unpacking a maliciously crafted archive. This could potentially lead to unauthorized file system modifications and compromise system integrity (NVD).

Apple has addressed this vulnerability by implementing improved locking mechanisms in the affected systems. The fix has been included in the following software updates: macOS Ventura 13.7, iOS 17.7, iPadOS 17.7, visionOS 2, iOS 18, iPadOS 18, macOS Sonoma 14.7, and macOS Sequoia 15. Users are advised to update their systems to these versions to mitigate the vulnerability (Apple Support).

The vulnerability was discovered and reported by security researcher Snoolie Keffaber (@0xilis), who was credited by Apple in their security advisory. The discovery highlights ongoing security research efforts in identifying and addressing potential threats in Apple's operating systems (Apple Support).