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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.1805 VMSA-2021-0010 - VMware vCenter Server - Critical RCE and Authentication Vulnerabilities 26 May 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: VMware vCenter Server (vCenter Server) VMware Cloud Foundation (Cloud Foundation) Publisher: VMWare Operating System: VMware ESX Server Virtualisation Windows Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated Unauthorised Access -- Remote/Unauthenticated Reduced Security -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2021-21986 CVE-2021-21985 Original Bulletin: https://www.vmware.com/security/advisories/VMSA-2021-0010.html - --------------------------BEGIN INCLUDED TEXT-------------------- VMSA-2021-0010 - VMware vCenter Server updates address remote code execution and authentication vulnerabilities (CVE-2021-21985, CVE-2021-21986) Advisory ID: VMSA-2021-0010 CVSSv3 Range: 6.5-9.8 Issue Date: 2021-05-25 Updated On: 2021-05-25 (Initial Advisory) CVE(s): CVE-2021-21985, CVE-2021-21986 Synopsis: VMware vCenter Server updates address remote code execution and authentication vulnerabilities (CVE-2021-21985, CVE-2021-21986) 1. Impacted Products VMware vCenter Server (vCenter Server) VMware Cloud Foundation (Cloud Foundation) 2. Introduction Multiple vulnerabilities in the vSphere Client (HTML5) were privately reported to VMware. Updates and workarounds are available to address these vulnerabilities in affected VMware products. 3a. VMware vCenter Server updates address remote code execution vulnerability in the vSphere Client (CVE-2021-21985) Description The vSphere Client (HTML5) contains a remote code execution vulnerability due to lack of input validation in the Virtual SAN Health Check plug-in which is enabled by default in vCenter Server. 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-2021-21985 apply the updates listed in the 'Fixed Version' column of the 'Response Matrix' below to affected deployments. Workarounds Workarounds for CVE-2021-21985 have been listed in the 'Workarounds' column of the 'Response Matrix' below. Additional Documentation None. Notes - The affected Virtual SAN Health Check plug-in is enabled by default in all vCenter Server deployments, whether or not vSAN is being used. - A supplemental blog post was created for additional clarification. Please see: https://via.vmw.com/vmsa-2021-0010-blog Acknowledgements VMware would like to thank Ricter Z of 360 Noah Lab 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-2021-21985, 9.8, critical, 7.0 U2b, KB83829 vCenter Server, 6.7, Any, CVE-2021-21985, 9.8, critical, 6.7 U3n, KB83829 vCenter Server, 6.5, Any, CVE-2021-21985, 9.8, critical, 6.5 U3p, KB83829 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-2021-21985, 9.8, critical, 4.2.1, KB83829 Cloud Foundation (vCenter Server), 3.x, Any, CVE-2021-21985, 9.8, critical, 3.10.2.1, KB83829 3b. Authentication mechanism issue in vCenter Server Plug-ins (CVE-2021-21986) Description The vSphere Client (HTML5) contains a vulnerability in a vSphere authentication mechanism for the Virtual SAN Health Check, Site Recovery, vSphere Lifecycle Manager, and VMware Cloud Director Availability plug-ins. VMware has evaluated the severity of this issue to be in the Moderate severity range with a maximum CVSSv3 base score of 6.5. Known Attack Vectors A malicious actor with network access to port 443 on vCenter Server may perform actions allowed by the impacted plug-ins without authentication. Resolution To remediate CVE-2021-21986 apply the updates listed in the 'Fixed Version' column of the 'Response Matrix' below to affected deployments. Workarounds Workarounds for CVE-2021-21986 have been listed in the 'Workarounds' column of the 'Response Matrix' below. Additional Documentation None. Notes A supplemental blog post was created for additional clarification. Please see: https://via.vmw.com/vmsa-2021-0010-blog Acknowledgements None. Response Matrix: Product Version Running On CVE Identifier CVSSv3 Severity Fixed Version Workarounds Additional Documentation vCenter Server, 7.0, Any, CVE-2021-21985, 9.8, critical, 7.0 U2b, KB83829 vCenter Server, 6.7, Any, CVE-2021-21985, 9.8, critical, 6.7 U3n, KB83829 vCenter Server, 6.5, Any, CVE-2021-21985, 9.8, critical, 6.5 U3p, KB83829 Impacted Product Suites that Deploy Response Matrix 3b Components: Product Version Running On CVE Identifier CVSSv3 Severity Fixed Version Workarounds Additional Documentation Cloud Foundation (vCenter Server), 4.x, Any, CVE-2021-21985, 9.8, critical, 4.2.1, KB83829 Cloud Foundation (vCenter Server), 3.x, Any, CVE-2021-21985, 9.8, critical, 3.10.2.1, KB83829 4. References Fixed Version(s) and Release Notes: vCenter Server 7.0 U2b Downloads and Documentation: https://my.vmware.com/en/web/vmware/downloads/info/slug/datacenter_cloud_infrastructure/vmware_vsphere/7_0 https://docs.vmware.com/en/VMware-vSphere/7.0/rn/vsphere-vcenter-server-70u2b-release-notes.html vCenter Server 6.7 U3n Downloads and Documentation: https://my.vmware.com/en/web/vmware/downloads/info/slug/datacenter_cloud_infrastructure/vmware_vsphere/6_7 https://docs.vmware.com/en/VMware-vSphere/6.7/rn/vsphere-vcenter-server-67u3n-release-notes.html vCenter Server 6.5 U3p Downloads and Documentation: https://my.vmware.com/en/web/vmware/downloads/info/slug/datacenter_cloud_infrastructure/vmware_vsphere/6_5 https://docs.vmware.com/en/VMware-vSphere/6.5/rn/vsphere-vcenter-server-65u3p-release-notes.html VMware vCloud Foundation 4.2.1 Downloads and Documentation: https://my.vmware.com/en/web/vmware/downloads/details?downloadGroup=VCF421&productId=1121&rPId=67576 https://docs.vmware.com/en/VMware-Cloud-Foundation/4.2.1/rn/VMware-Cloud-Foundation-421-Release-Notes.html VMware vCloud Foundation 3.10.2.1 Downloads and Documentation: https://docs.vmware.com/en/VMware-Cloud-Foundation/3.10.2/rn/VMware-Cloud-Foundation-3102-Release-Notes.html#3.10.2.1 Mitre CVE Dictionary Links: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21985 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21986 FIRST CVSSv3 Calculator: CVE-2021-21985: 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-2021-21986: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N 5. Change Log 2021-05-25 VMSA-2021-0010 Initial security advisory. - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is 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. 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