CVE-2021-30827: About the security content of macOS Big Sur 11.6

A permissions issue was addressed with improved validation. This issue is fixed in macOS Big Sur 11.5. A malicious application may be able to access data about the accounts the user is using Family Sharing with.

A URI parsing issue was addressed with improved parsing. This issue is fixed in Security Update 2021-005 Catalina, macOS Big Sur 11.6. A local user may be able to execute arbitrary files.

This issue was addressed with improved checks. This issue is fixed in Security Update 2021-005 Catalina, macOS Big Sur 11.6. A local user may be able to read arbitrary files as root.

A logic issue was addressed with improved state management. This issue is fixed in Security Update 2021-005 Catalina, macOS Big Sur 11.6. A remote attacker may be able to leak memory.

A memory corruption issue was addressed with improved state management. This issue is fixed in Security Update 2021-005 Catalina, macOS Big Sur 11.6. A local attacker may be able to elevate their privileges.

A logic issue was addressed with improved state management. This issue is fixed in Security Update 2021-002 Catalina, Security Update 2021-003 Mojave, iOS 14.5 and iPadOS 14.5, watchOS 7.4, tvOS 14.5, macOS Big Sur 11.3. An application may be able to execute arbitrary code with kernel privileges.

An application may be able to execute arbitrary code with system privileges. This issue is fixed in macOS Big Sur 11.3, Security Update 2021-002 Catalina. The issue was addressed with improved permissions logic.

A use after free issue was addressed with improved memory management. This issue is fixed in macOS Big Sur 11.3, Security Update 2021-002 Catalina, Security Update 2021-003 Mojave. Processing maliciously crafted web content may lead to arbitrary code execution.

A validation issue existed in the handling of symlinks. This issue was addressed with improved validation of symlinks. This issue is fixed in Security Update 2021-004 Mojave, iOS 14.6 and iPadOS 14.6, Security Update 2021-003 Catalina, macOS Big Sur 11.4, watchOS 7.5. A malicious application may be able to gain root privileges.

This issue was addressed by removing the vulnerable code. This issue is fixed in macOS Big Sur 11.4, Security Update 2021-003 Catalina, Security Update 2021-004 Mojave. An application may be able to gain elevated privileges.

A race condition was addressed with additional validation. This issue is fixed in Security Update 2021-002 Catalina, Security Update 2021-003 Mojave, iOS 14.5 and iPadOS 14.5, watchOS 7.4, tvOS 14.5, macOS Big Sur 11.3. A malicious application may be able to gain root privileges.

This issue was addressed with improved handling of file metadata. This issue is fixed in macOS Big Sur 11.3. A malicious application may bypass Gatekeeper checks.

A logic issue was addressed with improved state management. This issue is fixed in Security Update 2021-002 Catalina, Security Update 2021-003 Mojave, iOS 14.5 and iPadOS 14.5, watchOS 7.4, tvOS 14.5, macOS Big Sur 11.3. A local attacker may be able to elevate their privileges.

A permissions issue was addressed with improved validation. This issue is fixed in macOS Big Sur 11.4. A malicious application may be able to bypass Privacy preferences. Apple is aware of a report that this issue may have been actively exploited..

A logic issue was addressed with improved state management. This issue is fixed in macOS Big Sur 11.3, Security Update 2021-002 Catalina. A malicious application may bypass Gatekeeper checks. Apple is aware of a report that this issue may have been actively exploited..

A use after free issue was addressed with improved memory management. This issue is fixed in macOS Big Sur 11.4, Security Update 2021-003 Catalina, Security Update 2021-004 Mojave. A malicious application could execute arbitrary code leading to compromise of user information.

A logic issue was addressed with improved state management. This issue is fixed in macOS Big Sur 11.3, Security Update 2021-002 Catalina. A malicious application may bypass Gatekeeper checks.

This issue was addressed with improved environment sanitization. This issue is fixed in tvOS 14.6, iOS 14.6 and iPadOS 14.6, Security Update 2021-004 Catalina, Security Update 2021-005 Mojave, macOS Big Sur 11.4, watchOS 7.5. A malicious application may be able to break out of its sandbox.

An out-of-bounds read was addressed with improved bounds checking. This issue is fixed in iOS 14.7, macOS Big Sur 11.5. Processing a maliciously crafted file may disclose user information.

This issue was addressed with improved entitlements. This issue is fixed in macOS Big Sur 11.5. A malicious application may be able to bypass Privacy preferences.

An out-of-bounds read was addressed with improved input validation. This issue is fixed in macOS Big Sur 11.6, Security Update 2021-005 Catalina. A malicious application may be able to execute arbitrary code with kernel privileges.

A type confusion issue was addressed with improved state handling. This issue is fixed in iOS 12.5.5, iOS 14.4 and iPadOS 14.4, macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, Security Update 2021-006 Catalina. A malicious application may be able to execute arbitrary code with kernel privileges. Apple is aware of reports that an exploit for this issue exists in the wild.

This issue was addressed with improved checks. This issue is fixed in macOS Big Sur 11.6. A malicious application may bypass Gatekeeper checks.

An input validation issue was addressed with improved memory handling. This issue is fixed in macOS Big Sur 11.1, Security Update 2020-001 Catalina, Security Update 2020-007 Mojave. A malicious application may be able to read restricted memory.