VMSA-2020-0022

Moderate

Advisory ID: VMSA-2020-0022

CVSSv3 Range: 5.9

Issue Date: 2020-10-15

Updated On: 2020-10-15 (Initial Advisory)

CVE(s): CVE-2020-3991

Synopsis: VMware Horizon Client update addresses a denial-of-service vulnerability (CVE-2020-3991)

1. Impacted Products

VMware Horizon Client for Windows

2. Introduction

A denial-of-service vulnerability affecting VMware Horizon Client for Windows was privately reported to VMware. Updates are available to address this vulnerability in affected VMware product.

3. File system access control denial-of-service vulnerability (CVE-2020-3991)

Description

VMware Horizon Client for Windows contains a denial-of-service vulnerability due to a file system access control issue during install time. VMware has evaluated the severity of this issue to be in the Moderate severity range with a maximum CVSSv3 base score of 5.9.

Known Attack Vectors

Successful exploitation of this issue may allow an attacker to overwrite certain admin privileged files through a symbolic link attack at install time. This will result into a denial-of-service condition on the machine where Horizon Client for Windows is installed.

Resolution

To remediate CVE-2020-3991 apply the patches listed in the 'Fixed Version' column of the 'Response Matrix' below.

Workarounds

None.

Additional Documentation

None.

Notes

None.

Acknowledgements

VMware would like to thank Eran Shimony of CyberArk for reporting this issue to us.

Response Matrix

Product	Version	Running On	CVE Identifier	CVSSv3	Severity	Fixed Version	Workarounds	Additional Documentation
Horizon Client for Windows	5.x and prior	Windows	CVE-2020-3991	5.9	moderate	5.5.0	None	None