CVE Vulnerabilities

CVE-2021-1764

Use After Free

Published: Apr 02, 2021 | Modified: Apr 09, 2021
CVSS 3.x
7.5
HIGH
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.x
5 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P
RedHat/V2
RedHat/V3
Ubuntu

A use after free issue was addressed with improved memory management. 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 remote attacker may be able to cause a denial of service.

Weakness

Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code.

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

The use of previously-freed memory can have any number of adverse consequences, ranging from the corruption of valid data to the execution of arbitrary code, depending on the instantiation and timing of the flaw. The simplest way data corruption may occur involves the system’s reuse of the freed memory. Use-after-free errors have two common and sometimes overlapping causes:

In this scenario, the memory in question is allocated to another pointer validly at some point after it has been freed. The original pointer to the freed memory is used again and points to somewhere within the new allocation. As the data is changed, it corrupts the validly used memory; this induces undefined behavior in the process. If the newly allocated data happens to hold a class, in C++ for example, various function pointers may be scattered within the heap data. If one of these function pointers is overwritten with an address to valid shellcode, execution of arbitrary code can be achieved.

Potential Mitigations

References