Time-of-check Time-of-use (TOCTOU) in VMware Fusion, VMRC for Mac and Horizon Client for Mac



Published: 2020-05-29
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-3957
CWE-ID N/A
Exploitation vector Local
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
Subscribe 		VMware Fusion
Client/Desktop applications / Virtualization software

VMRC
Client/Desktop applications / Software for system administration

VMware Horizon Client
Client/Desktop applications / Software for system administration

Vendor VMware, Inc

Security Bulletin

This security bulletin contains one low risk vulnerability.

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

EUVDB-ID: #VU28338

Risk: Low

CVSSv3.1:

CVE-ID: CVE-2020-3957

CWE-ID: N/A

Exploit availability: Yes

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 - 11.5.3

VMRC: 8.0.0 - 11.1.0

VMware Horizon Client: 3.0.0 - 5.4

CPE2.3 External links

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

Q & A

Can this vulnerability be exploited remotely?

How the attacker can exploit this vulnerability?

Is there known malware, which exploits this vulnerability?



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