CVE Vulnerabilities

CVE-2021-22040

Use After Free

Published: Feb 16, 2022 | Modified: Feb 24, 2022
CVSS 3.x
6.7
MEDIUM
Source:
NVD
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
CVSS 2.x
4.6 MEDIUM
AV:L/AC:L/Au:N/C:P/I:P/A:P
RedHat/V2
RedHat/V3
Ubuntu

VMware ESXi, Workstation, and Fusion contain a use-after-free vulnerability in the XHCI USB controller. A malicious actor with local administrative privileges on a virtual machine may exploit this issue to execute code as the virtual machine’s VMX process running on the host.

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
Cloud_foundation Vmware 3.0 *
Cloud_foundation Vmware 4.0 *
Fusion Vmware 12.0.0 *
Workstation_player Vmware 16.0.0 *
Workstation_pro Vmware 16.0.0 *
Esxi Vmware 6.5 6.5
Esxi Vmware 6.5 6.5
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 6.7 6.7
Esxi Vmware 7.0 7.0
Esxi Vmware 7.0 7.0
Esxi Vmware 7.0 7.0
Esxi Vmware 7.0 7.0

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 chances 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