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                             CERT-Renater

                 Note d'Information No. 2020/VULN572
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DATE                : 16/10/2020

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S): Systems running VMware Horizon Client versions
                                        prior to 5.5.0.

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https://www.vmware.com/security/advisories/VMSA-2020-0022.html
_____________________________________________________________________

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


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:
https://kb.vmware.com/kb/1055


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


Twitter
https://twitter.com/VMwareSRC



Copyright 2020 VMware Inc. All rights reserved.

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+ CERT-RENATER       |    tel : 01-53-94-20-44          +
+ 23/25 Rue Daviel   |    fax : 01-53-94-20-41          +
+ 75013 Paris        |    email:cert@support.renater.fr +
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