CVE Vulnerabilities

CVE-2021-1782

Improper Locking

Published: Apr 02, 2021 | Modified: Aug 08, 2023
CVSS 3.x
7
HIGH
Source:
NVD
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 2.x
6.9 MEDIUM
AV:L/AC:M/Au:N/C:C/I:C/A:C
RedHat/V2
RedHat/V3
Ubuntu

A race condition was addressed with improved locking. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, watchOS 7.3, tvOS 14.4, iOS 14.4 and iPadOS 14.4. A malicious application may be able to elevate privileges. Apple is aware of a report that this issue may have been actively exploited..

Weakness

The product does not properly acquire or release a lock on a resource, leading to unexpected resource state changes and behaviors.

Affected Software

Name Vendor Start Version End Version
Mac_os_x Apple 10.15 *
Mac_os_x Apple 10.14 *
Mac_os_x Apple 10.14.6 10.14.6
Mac_os_x Apple 10.14.6 10.14.6
Mac_os_x Apple 10.14.6 10.14.6
Mac_os_x Apple 10.14.6 10.14.6
Mac_os_x Apple 10.14.6 10.14.6
Mac_os_x Apple 10.14.6 10.14.6
Mac_os_x Apple 10.14.6 10.14.6
Mac_os_x Apple 10.14.6 10.14.6
Mac_os_x Apple 10.14.6 10.14.6
Mac_os_x Apple 10.14.6 10.14.6
Mac_os_x Apple 10.14.6 10.14.6
Mac_os_x Apple 10.14.6 10.14.6
Mac_os_x Apple 10.14.6 10.14.6
Mac_os_x Apple 10.15.7 10.15.7
Mac_os_x Apple 10.15.7 10.15.7
Mac_os_x Apple 10.14.6 10.14.6
Ipados Apple * *
Iphone_os Apple * *
Tvos Apple * *
Watchos Apple * *
Macos Apple 11.0 *

Extended Description

Locking is a type of synchronization behavior that ensures that multiple independently-operating processes or threads do not interfere with each other when accessing the same resource. All processes/threads are expected to follow the same steps for locking. If these steps are not followed precisely - or if no locking is done at all - then another process/thread could modify the shared resource in a way that is not visible or predictable to the original process. This can lead to data or memory corruption, denial of service, etc.

Potential Mitigations

References