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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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You have received this e-mail bulletin as a result of your organisation's
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receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.
NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.
NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.
Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
https://www.auscert.org.au/bulletins/
===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
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