VMware Security Solutions Advisories VMSA-2021-0002 Appunti dalla rete

Advisory ID: VMSA-2021-0002
CVSSv3 Range: 5.3-9.8
Issue Date: 2021-02-23
Updated On: 2021-02-23 (Initial Advisory)
CVE(s): CVE-2021-21972, CVE-2021-21973, CVE-2021-21974
Synopsis: VMware ESXi and vCenter Server updates address multiple security vulnerabilities (CVE-2021-21972, CVE-2021-21973, CVE-2021-21974)

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	7.0 U1c	KB82374	None
vCenter Server	6.7	Any	CVE-2021-21972	9.8	Critical	6.7 U3l	KB82374	None
vCenter Server	6.5	Any	CVE-2021-21972	9.8	Critical	6.5 U3n	KB82374	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	KB82374	None
Cloud Foundation (vCenter Server)	3.x	Any	CVE-2021-21972	9.8	Critical	3.10.1.2	KB82374	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	KB76372	None
[1] ESXi	6.7	Any	CVE-2021-21974	8.8	Important	ESXi670-202102401-SG	KB76372	None
[1] ESXi	6.5	Any	CVE-2021-21974	8.8	Important	ESXi650-202102101-SG	KB76372	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	KB76372	None
[1] Cloud Foundation (ESXi)	3.x	Any	CVE-2021-21974	8.8	Important	[2] KB82705	KB76372	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	7.0 U1c	KB82374	None
vCenter Server	6.7	Any	CVE-2021-21973	5.3	Moderate	6.7 U3l	KB82374	None
vCenter Server	6.5	Any	CVE-2021-21973	5.3	Moderate	6.5 U3n	KB82374	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	KB82374	None
Cloud Foundation (vCenter Server)	3.x	Any	CVE-2021-21973	5.3	Moderate	3.10.1.2	KB82374	None