Zero-day vulnerability in macOS

Type Confusion
CVE-2021-30869

Vulnerability details

Advisory: SB2021092316 - Privilege escalation in Apple macOS Catalina

Vulnerable component: macOS

CVE-ID: CVE-2021-30869

CVSSv3 score: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:H/RL:O/RC:C

CWE-ID: CWE-843 - Access of Resource Using Incompatible Type ('Type Confusion')

Description:

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a type confusion error within the XNU subsystem. A local user can run a specially crafted program to trigger a type confusion error and execute arbitrary code with elevated privileges.

Note, the vulnerability is being actively exploited in the wild.

External links:

https://support.apple.com/en-us/HT212825