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AUSCERT External Security Bulletin Redistribution
ESB-2020.3253
VMSA-2020-0021 - Horizon DaaS update addresses a broken
authentication vulnerability (CVE-2020-3977)
23 September 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: VMWare Horizon DaaS
Publisher: VMWare
Operating System: Virtualisation
Impact/Access: Unauthorised Access -- Existing Account
Reduced Security -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-3977
Original Bulletin:
https://www.vmware.com/security/advisories/VMSA-2020-0021.html
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Advisory ID: VMSA-2020-0021
CVSSv3 Range: 6.3
Issue Date: 2020-09-22
Updated On: 2020-09-22 (Initial Advisory)
CVE(s): CVE-2020-3977
Synopsis: Horizon DaaS update addresses a broken authentication vulnerability
(CVE-2020-3977)
1. Impacted Products
o VMware Horizon DaaS (Horizon DaaS)
2. Introduction
A broken authentication vulnerability affecting VMware Horizon DaaS was
privately reported to VMware. Updates are available to address this
vulnerability in affected VMware product.
3. Advisory Details
Description
Horizon DaaS contains a broken authentication vulnerability due to a flaw in
the way it handled the first factor authentication. VMware has evaluated the
severity of this issue to be in the Moderate severity range with a maximum
CVSSv3 base score of 6.3.
Known Attack Vectors
Successful exploitation of this issue may allow an attacker to bypass
two-factor authentication process.
Note: In order to exploit this issue, an attacker must have a legitimate
account on Horizon DaaS.
Resolution
To remediate CVE-2020-3977 apply the patches listed in the 'Fixed Version'
column of the 'Response Matrix' below.
Workarounds
None.
Additional Documentation
None.
Notes
In order to exploit this issue, an attacker must have a legitimate account on
Horizon DaaS.
Acknowledgements
VMware would like to thank David Roccasalva of Privasec for reporting this
issue to us.
Response Matrix
Product Version Running CVE CVSSv3 Severity Fixed Workarounds Additional
On Identifier Version Documentation
Horizon 9.x Any CVE-2020-3977 N/A N/A not N/A N/A
DaaS affected
Horizon 7.x, 8.0.1
DaaS 8.x Any CVE-2020-3977 6.3 moderate Update None None
1**
**This update applies to 8.0.1 only. Please see the download link for more
information.
4. References
Fixed Version(s) and Release Notes:
Horizon DaaS 8.0.1 Update 1
Downloads and Documentation:
https://my.vmware.com/web/vmware/downloads/details?downloadGroup=
HORIZON_DAAS_801&productId=743&rPId=36148
https://docs.vmware.com/en/VMware-Horizon-DaaS/services/rn/
Horizon-DaaS-801-Release-Notes.html#rollup
Mitre CVE Dictionary Links:
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-3977
FIRST CVSSv3 Calculator:
https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/
I:L/A:L
5. Change Log
2020-09-22 VMSA-2020-0021
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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