Critical

VMSA-2021-0002
5.3-9.8
2021-02-23
2021-02-23 (Initial Advisory)
CVE-2021-21972, CVE-2021-21973, CVE-2021-21974
VMware ESXi and vCenter Server updates address multiple security vulnerabilities (CVE-2021-21972, CVE-2021-21973, CVE-2021-21974)

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1. Impacted Products
  • VMware ESXi
  • VMware vCenter Server (vCenter Server)
  • VMware Cloud Foundation (Cloud Foundation)
2. Introduction

Multiple vulnerabilities in VMware ESXi and vSphere Client (HTML5) were privately reported to VMware. Updates are available to remediate these vulnerabilities in affected VMware products.

3a. VMware vCenter Server updates address remote code execution vulnerability in the vSphere Client (CVE-2021-21972)

Description

The vSphere Client (HTML5) contains a remote code execution vulnerability in a vCenter Server plugin. VMware has evaluated the severity of this issue to be in the Critical severity range with a maximum CVSSv3 base score of 9.8.

Known Attack Vectors

A malicious actor with network access to port 443 may exploit this issue to execute commands with unrestricted privileges on the underlying operating system that hosts vCenter Server. 

Resolution

To remediate CVE-2021-21972 apply the updates listed in the 'Fixed Version' column of the 'Response Matrix' below to affected deployments.

Workarounds

Workarounds for CVE-2021-21972 have been listed in the 'Workarounds' column of the 'Response Matrix' below.

Additional Documentation

None.

Notes

The affected vCenter Server plugin for vROPs is available in all default installations. vROPs does not need be present to have this endpoint available. Follow the workarounds KB to disable it.

Acknowledgements

VMware would like to thank Mikhail Klyuchnikov of Positive Technologies for reporting this issue to us.

Response Matrix:

Product Version Running On CVE Identifier CVSSv3 Severity Fixed Version Workarounds Additional Documentation
vCenter Server
7.0
Any
CVE-2021-21972
9.8
critical
None
vCenter Server
6.7
Any
CVE-2021-21972
9.8
critical
None
vCenter Server
6.5
Any
CVE-2021-21972
9.8
critical
None

Impacted Product Suites that Deploy Response Matrix 3a Components:

Product Version Running On CVE Identifier CVSSv3 Severity Fixed Version Workarounds Additional Documentation
Cloud Foundation (vCenter Server)
4.x
Any
CVE-2021-21972
9.8
critical
4.2
None
Cloud Foundation (vCenter Server)
3.x
Any
CVE-2021-21972
9.8
critical
3.10.1.2
None
3b. ESXi OpenSLP heap-overflow vulnerability (CVE-2021-21974)

Description

OpenSLP as used in ESXi has a heap-overflow vulnerability. VMware has evaluated the severity of this issue to be in the Important severity range with a maximum CVSSv3 base score of 8.8.

Known Attack Vectors

A malicious actor residing within the same network segment as ESXi who has access to port 427 may be able to trigger the heap-overflow issue in OpenSLP service resulting in remote code execution.

Resolution

To remediate CVE-2021-21974 apply the updates listed in the 'Fixed Version' column of the 'Response Matrix' below to affected deployments.

Workarounds

Workarounds for CVE-2021-21974 have been listed in the 'Workarounds' column of the 'Response Matrix' below.

Additional Documentation

None.

Notes

[1] Per the Security Configuration Guides for VMware vSphere, VMware now recommends disabling the OpenSLP service in ESXi if it is not used. For more information, see our blog posting: https://blogs.vmware.com/vsphere/2021/02/evolving-the-vmware-vsphere-security-configuration-guides.html

[2] KB82705 documents steps to consume ESXi hot patch asynchronously on top of latest VMware Cloud Foundation (VCF) supported ESXi build. 

Acknowledgements

VMware would like to thank Lucas Leong (@_wmliang_) of Trend Micro's Zero Day Initiative for reporting this issue to us.

Response Matrix:

Product Version Running On CVE Identifier CVSSv3 Severity Fixed Version Workarounds Additional Documentation
[1] ESXi
7.0
Any
CVE-2021-21974
8.8
important
ESXi70U1c-17325551
None
[1] ESXi
6.7
Any
CVE-2021-21974
8.8
important
ESXi670-202102401-SG
None
[1] ESXi
6.5
Any
CVE-2021-21974
8.8
important
ESXi650-202102101-SG
None

Impacted Product Suites that Deploy Response Matrix 3b Components:

Product Version Running On CVE Identifier CVSSv3 Severity Fixed Version Workarounds Additional Documentation
[1] Cloud Foundation (ESXi)
4.x
Any
CVE-2021-21974
8.8
important
4.2
None
[1] Cloud Foundation (ESXi)
3.x
Any
CVE-2021-21974
8.8
important
None
3c. VMware vCenter Server updates address SSRF vulnerability in the vSphere Client (CVE-2021-21973)

Description

The vSphere Client (HTML5) contains an SSRF (Server Side Request Forgery) vulnerability due to improper validation of URLs in a vCenter Server plugin. VMware has evaluated the severity of this issue to be in the Moderate severity range with a maximum CVSSv3 base score of 5.3.

Known Attack Vectors

A malicious actor with network access to port 443 may exploit this issue by sending a POST request to vCenter Server plugin leading to information disclosure.

Resolution

To remediate CVE-2021-21973 apply the updates listed in the 'Fixed Version' column of the 'Response Matrix' below to affected deployments.

Workarounds

Workarounds for CVE-2021-21973 have been listed in the 'Workarounds' column of the 'Response Matrix' below.

Additional Documentation

None.

Notes

The affected vCenter Server plugin for vROPs is available in all default installations. vROPs does not need be present to have this endpoint available. Follow the workarounds KB to disable it.

Acknowledgements

VMware would like to thank Mikhail Klyuchnikov of Positive Technologies for reporting this issue to us.

Response Matrix:

Product Version Running On CVE Identifier CVSSv3 Severity Fixed Version Workarounds Additional Documentation
vCenter Server
7.0
Any
CVE-2021-21973
5.3
moderate
None
vCenter Server
6.7
Any
CVE-2021-21973
5.3
moderate
None
vCenter Server
6.5
Any
CVE-2021-21973
5.3
moderate
None

Impacted Product Suites that Deploy Response Matrix 3c Components:

Product Version Running On CVE Identifier CVSSv3 Severity Fixed Version Workarounds Additional Documentation
Cloud Foundation (vCenter Server)
4.x
Any
CVE-2021-21973
5.3
moderate
4.2
None
Cloud Foundation (vCenter Server)
3.x
Any
CVE-2021-21973
5.3
moderate
3.10.1.2
None
4. References

VMware ESXi 7.0 ESXi70U1c-17325551
https://my.vmware.com/group/vmware/patch
https://docs.vmware.com/en/VMware-vSphere/7.0/rn/vsphere-esxi-70u1c.html

 

VMware ESXi 6.7 ESXi670-202102401-SG
https://my.vmware.com/group/vmware/patch
https://docs.vmware.com/en/VMware-vSphere/6.7/rn/esxi670-202102001.html

 

VMware ESXi 6.5 ESXi650-202102101-SG
https://my.vmware.com/group/vmware/patch
https://docs.vmware.com/en/VMware-vSphere/6.5/rn/esxi650-202102001.html

 

VMware vCloud Foundation 4.2
Downloads and Documentation:
https://docs.vmware.com/en/VMware-Cloud-Foundation/4.2/rn/VMware-Cloud-Foundation-42-Release-Notes.html


VMware vCloud Foundation 3.10.1.2
Downloads and Documentation:
https://docs.vmware.com/en/VMware-Cloud-Foundation/3.10.1/rn/VMware-Cloud-Foundation-3101-Release-Notes.html


vCenter Server 7.0.1 Update 1
Downloads and Documentation:
https://my.vmware.com/web/vmware/downloads/details?downloadGroup=VC70U1C&productId=974
https://docs.vmware.com/en/VMware-vSphere/7.0/rn/vsphere-vcenter-server-70u1c-release-notes.html

 

vCenter Server 6.7 U3l
Downloads and Documentation:
https://my.vmware.com/web/vmware/downloads/details?downloadGroup=VC67U3L&productId=742&rPId=57171
https://docs.vmware.com/en/VMware-vSphere/6.7/rn/vsphere-vcenter-server-67u3l-release-notes.html

 

vCenter Server 6.5 U3n
Downloads and Documentation:
https://my.vmware.com/web/vmware/downloads/details?downloadGroup=VC65U3N&productId=614&rPId=60942
https://docs.vmware.com/en/VMware-vSphere/6.5/rn/vsphere-vcenter-server-65u3n-release-notes.html

 

Mitre CVE Dictionary Links:
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21972
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21973
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21974

 

FIRST CVSSv3 Calculator:
CVE-2021-21972: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVE-2021-21973: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CVE-2021-21974: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

 

5. Change Log

2021-02-23 VMSA-2021-0002
Initial security advisory.

6. Contact

E-mail list for product security notifications and announcements:

https://lists.vmware.com/cgi-bin/mailman/listinfo/security-announce 

 

This Security Advisory is posted to the following lists:  

security-announce@lists.vmware.com  

bugtraq@securityfocus.com  

fulldisclosure@seclists.org 

 

E-mail: security@vmware.com

PGP key at:

https://kb.vmware.com/kb/1055 

 

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