CVE Vulnerabilities

CVE-2021-22043

Time-of-check Time-of-use (TOCTOU) Race Condition

Published: Feb 16, 2022 | Modified: Feb 24, 2022
CVSS 3.x
7.5
HIGH
Source:
NVD
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 2.x
6 MEDIUM
AV:N/AC:M/Au:S/C:P/I:P/A:P
RedHat/V2
RedHat/V3
Ubuntu

VMware ESXi contains a TOCTOU (Time-of-check Time-of-use) vulnerability that exists in the way temporary files are handled. A malicious actor with access to settingsd, may exploit this issue to escalate their privileges by writing arbitrary files.

Weakness

The software checks the state of a resource before using that resource, but the resource’s state can change between the check and the use in a way that invalidates the results of the check. This can cause the software to perform invalid actions when the resource is in an unexpected state.

Affected Software

Name Vendor Start Version End Version
Fusion Vmware * *
Esxi Vmware 7.0 7.0
Esxi Vmware 7.0 7.0
Esxi Vmware 7.0 7.0

Potential Mitigations

References