Security restrictions bypass in macOS - CVE-2021-30906

Vulnerability identifier: #VU57717

CSH Severity: Low

CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-30906

CWE-ID: CWE-264

Exploitation vector: Local access

Exploit availability: No public exploit available

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

The vulnerability exists due improper permissions checks in iCloud. A local user can bypass security restrictions bypass and escalate privileges on the system.

macOS
watchOS
tvOS
Apple iOS
iPadOS

Install updates from vendor's website.

macOS - addressed in versions 11.6.1 20G224, 10.15.7 19H1519, 12.0.1 21A559
watchOS - update to 8.1 19R570
tvOS - update to 15.1 19J572
Apple iOS - update to 15.1 19B74
iPadOS - addressed in versions 15.1 19B74, 15.1 19B75

• https://support.apple.com/en-us/HT212872

• Multiple vulnerabilities in macOS Big Sur
• Multiple vulnerabilities in macOS Monterey
• Multiple vulnerabilities in Apple iOS 15 and iPadOS 15
• Multiple vulnerabilities in Apple watchOS
• Multiple vulnerabilities in Apple tvOS
• Multiple vulnerabilities in macOS Catalina