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AUSCERT External Security Bulletin Redistribution
ESB-2021.1315
VMware NSX-T updates address a privilege escalation
vulnerability (CVE-2021-21981)
20 April 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: NSX-T
Publisher: VMWare
Operating System: Virtualisation
UNIX variants (UNIX, Linux, OSX)
Windows
Impact/Access: Increased Privileges -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-21981
Original Bulletin:
https://www.vmware.com/security/advisories/VMSA-2021-0006.html
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Advisory ID: VMSA-2021-0006
CVSSv3 Range: 7.5
Issue Date: 2021-04-19
Updated On: 2021-04-19 (Initial Advisory)
CVE(s): CVE-2021-21981
Synopsis: VMware NSX-T updates address a privilege escalation vulnerability
(CVE-2021-21981)
1. Impacted Products
o VMware NSX-T
2. Introduction
A privilege escalation vulnerability in VMware NSX-T was privately reported to
VMware. Updates are available to remediate this vulnerability in affected
VMware product.
3. Privilege escalation vulnerability (CVE-2021-21981)
Description
VMware NSX-T contains a privilege escalation vulnerability due to an issue with
RBAC (Role based access control) role assignment. VMware has evaluated this
issue to be 'Important' severity with a maximum CVSSv3 base score of 7.5.
Known Attack Vectors
Successful exploitation of this issue may allow attackers with local guest user
account to assign privileges higher than their own permission level.
Resolution
To remediate CVE-2021-21981 apply the patches listed in the 'Fixed Version'
column of the 'Response Matrix' found below.
Workarounds
Workarounds for CVE-2021-21981 have been listed in the 'Workarounds' column of
the 'Response Matrix' below.
Additional Documentation
None.
Notes
[1] To exploit this issue, NSX Enterprise administrator must activate the local
guest user account. It is not activated by default.
[2] This issue affects only version 3.1.1. Other versions are not affected.
Acknowledgements
None.
Response Matrix
Product Version Running CVE Identifier CVSSv3 Severity Fixed Workarounds Additional
On Version Documentation
NSX-T 3.1.1 Any CVE-2021-21981 7.5 important 3.1.2 KB83047 None
[1] [2]
4. References
VMware NSX-T 3.1.2
Downloads and Documentation:
https://my.vmware.com/en/web/vmware/downloads/details?downloadGroup=NSX-T-312&
productId=982&rPId=64728
https://docs.vmware.com/en/VMware-NSX-T-Data-Center/index.html
Mitre CVE Dictionary Links:
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21981
FIRST CVSSv3 Calculator:
CVE-2021-21981: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:H/
PR:L/UI:N/S:U/C:H/I:H/A:H
5. Change Log
2021-04-19 VMSA-2021-0006
Initial security advisory.
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You have received this e-mail bulletin as a result of your organisation's
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maintained within your organisation, so if you do not wish to continue
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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