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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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