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

Risk: Low

CVSSv3: 6.4 [CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2020-3957

CWE-ID: -

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a Time-of-check Time-of-use (TOCTOU) issue in the service opener. An local user can gain elevated privileges on the target system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

VMware Fusion: 11.0.0, 11.0.1, 11.0.2, 11.0.3, 11.1.0, 11.1.1, 11.5.0, 11.5.1, 11.5.2, 11.5.3

VMRC: 8.0.0, 8.0.1, 8.1.0, 9.0.0, 10.0.0, 10.0.1, 10.0.2, 10.0.3, 10.0.4, 10.0.5, 10.0.6, 11.0.0, 11.0.1, 11.1.0

VMware Horizon Client: 3.0.0, 4.0.0, 4.1, 4.1.0, 4.2, 4.2.0, 4.3, 4.3.0, 4.4, 4.4.0, 4.5, 4.5.0, 4.6, 4.6.0, 4.7, 4.7.0, 4.8, 4.8.0, 4.9, 4.9.0, 4.10, 4.10.0, 5.0, 5.0.0, 5.1, 5.1.0, 5.2, 5.2.0, 5.3, 5.4

CPE

• cpe:/a:vmware:vmware_fusion:11.5.3:
• cpe:/a:vmware:vmware_fusion:11.5.2:
• cpe:/a:vmware:vmware_fusion:11.5.1:
• cpe:/a:vmware:vmware_fusion:11.5.0:
• cpe:/a:vmware:vmware_fusion:11.1.1:
• cpe:/a:vmware:vmware_fusion:11.1.0:
• cpe:/a:vmware:vmware_fusion:11.0.3:
• cpe:/a:vmware:vmware_fusion:11.0.2:
• cpe:/a:vmware:vmware_fusion:11.0.1:
• cpe:/a:vmware:vmware_fusion:11.0.0:
• cpe:/a:vmware:vmrc:11.1.0:
• cpe:/a:vmware:vmrc:11.0.1:
• cpe:/a:vmware:vmrc:11.0.0:
• cpe:/a:vmware:vmrc:8.0.0:
• cpe:/a:vmware:vmrc:8.0.1:
• cpe:/a:vmware:vmrc:8.1.0:
• cpe:/a:vmware:vmrc:9.0.0:
• cpe:/a:vmware:vmrc:10.0.0:
• cpe:/a:vmware:vmrc:10.0.1:
• cpe:/a:vmware:vmrc:10.0.2:
• cpe:/a:vmware:vmrc:10.0.3:
• cpe:/a:vmware:vmrc:10.0.4:
• cpe:/a:vmware:vmrc:10.0.5:
• cpe:/a:vmware:vmrc:10.0.6:
• cpe:/a:vmware:vmware_horizon_client:5.4:
• cpe:/a:vmware:vmware_horizon_client:5.3:
• cpe:/a:vmware:vmware_horizon_client:5.2:
• cpe:/a:vmware:vmware_horizon_client:5.1:
• cpe:/a:vmware:vmware_horizon_client:5.0:
• cpe:/a:vmware:vmware_horizon_client:4.10:
• cpe:/a:vmware:vmware_horizon_client:4.9:
• cpe:/a:vmware:vmware_horizon_client:4.8:
• cpe:/a:vmware:vmware_horizon_client:4.7:
• cpe:/a:vmware:vmware_horizon_client:4.6:
• cpe:/a:vmware:vmware_horizon_client:4.5:
• cpe:/a:vmware:vmware_horizon_client:4.4:
• cpe:/a:vmware:vmware_horizon_client:4.3:
• cpe:/a:vmware:vmware_horizon_client:4.2:
• cpe:/a:vmware:vmware_horizon_client:4.1:
• cpe:/a:vmware:vmware_horizon_client:3.0.0:
• cpe:/a:vmware:vmware_horizon_client:4.0.0:
• cpe:/a:vmware:vmware_horizon_client:4.1.0:
• cpe:/a:vmware:vmware_horizon_client:4.2.0:
• cpe:/a:vmware:vmware_horizon_client:4.3.0:
• cpe:/a:vmware:vmware_horizon_client:4.4.0:
• cpe:/a:vmware:vmware_horizon_client:4.5.0:
• cpe:/a:vmware:vmware_horizon_client:4.6.0:
• cpe:/a:vmware:vmware_horizon_client:4.7.0:
• cpe:/a:vmware:vmware_horizon_client:4.8.0:
• cpe:/a:vmware:vmware_horizon_client:4.9.0:
• cpe:/a:vmware:vmware_horizon_client:4.10.0:
• cpe:/a:vmware:vmware_horizon_client:5.0.0:
• cpe:/a:vmware:vmware_horizon_client:5.1.0:
• cpe:/a:vmware:vmware_horizon_client:5.2.0:

External links

http://www.vmware.com/security/advisories/VMSA-2020-0011.html

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to open a a specially crafted file.

The attacker would have to login to the system and perform certain actions in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.