Moderate
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
|
moderate
|
5.5.0
|
None
|
None
|
4. References
Fixed Version(s) and Release Notes:
Horizon Client for Windows 5.5.0
Downloads and Documentation:
https://my.vmware.com/en/web/vmware/downloads/details?downloadGroup=CART21FQ3_WIN_550&productId=863&rPId=53321
https://docs.vmware.com/en/VMware-Horizon-Client/index.html
Mitre CVE Dictionary Links:
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-3991
FIRST CVSSv3 Calculator:
https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:N/A:H
5. Change Log
2020-10-15 VMSA-2020-0022
Initial security advisory.
6. Contact
E-mail list for product security notifications and announcements:
https://lists.vmware.com/cgi-bin/mailman/listinfo/security-announce
This Security Advisory is posted to the following lists:
security-announce@lists.vmware.com
E-mail: security@vmware.com
PGP key at:
VMware Security Advisories
https://www.vmware.com/security/advisories
VMware Security Response Policy
https://www.vmware.com/support/policies/security_response.html
VMware Lifecycle Support Phases
https://www.vmware.com/support/policies/lifecycle.html
VMware Security & Compliance Blog
https://blogs.vmware.com/security
Copyright 2020 VMware Inc. All rights reserved.