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AUSCERT External Security Bulletin Redistribution
ESB-2020.2041
VMware Horizon Client for Windows update addresses privilege
escalation vulnerability
11 June 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: VMware Horizon Client for Windows
Publisher: VMWare
Operating System: Windows
Impact/Access: Increased Privileges -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-3961
Original Bulletin:
https://www.vmware.com/security/advisories/VMSA-2020-0013.html
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Advisory ID: VMSA-2020-0013
CVSSv3 Range: 8.4
Issue Date: 2020-06-09
Updated On: 2020-06-09 (Initial Advisory)
CVE(s): CVE-2020-3961
Synopsis: VMware Horizon Client for Windows update addresses privilege
escalation vulnerability (CVE-2020-3961)
1. Impacted Products
o VMware Horizon Client for Windows
2. Introduction
A privilege escalation vulnerability affecting VMware Horizon Client for
Windows was privately reported to VMware. Updates are available to address this
vulnerability in affected VMware products.
3. VMware Horizon Client for Windows privilege escalation vulnerability
Description
VMware Horizon Client for Windows contains a privilege escalation vulnerability
due to folder permission configuration and unsafe loading of libraries. VMware
has evaluated the severity of this issue to be in the Important severity range
with a maximum CVSSv3 base score of 8.4.
Known Attack Vendors
A local user on the system where the software is installed may exploit this
issue to run commands as any user.
Resolution
To remediate CVE-2020-3961 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 Nuttakorn Tungpoonsup and Ammarit Thongthua of
Secure D Center Research Team, Secure D Center Co.,Ltd. and Cybersecurity
Researcher, Sittikorn Sangrattanapitak for reporting this issue to us.
Response Matrix
Product Version Running CVE CVSSv3 Severity Fixed Workarounds Additional
On Identifier Version Documentation
Horizon
Client 5.x and Windows CVE-2020-3961 8.4 important 5.4.3 None None
for prior
Windows
4. References
Fixed Version(s) and Release Notes:
VMware Horizon Client 5.4.3
Downloads and Documentation:
https://my.vmware.com/web/vmware/info/slug/desktop_end_user_computing/
vmware_horizon_clients/5_0
https://docs.vmware.com/en/VMware-Horizon-Client/index.html
Mitre CVE Dictionary Links:
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-3961
FIRST CVSSv3 Calculator:
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/
I:H/A:N
5. Change Log
2020-06-09 VMSA-2020-0013
Initial security advisory.
6. Contact
E-mail list for product security notifications and announcements:
https://lists.vmware.com/cgi-bin/mailman/listinfo/security-announce
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