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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.0677 VMSA-2021-0002 VMware ESXi and vCenter Server updates address multiple security vulnerabilities 24 February 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: VMware ESXi VMware vCenter Server (vCenter Server) VMware Cloud Foundation (Cloud Foundation) vSphere Client (HTML5) Publisher: VMware Operating System: Virtualisation VMware ESX Server Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated Access Confidential Data -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2021-21974 CVE-2021-21973 CVE-2021-21972 Original Bulletin: https://www.vmware.com/security/advisories/VMSA-2021-0002.html - --------------------------BEGIN INCLUDED TEXT-------------------- 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 o VMware ESXi o VMware vCenter Server (vCenter Server) o 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 CVE Identifier CVSSv3 Severity Fixed Workarounds Additional On Version Documentation vCenter 7.0 Any CVE-2021-21972 9.8 critical 7.0 U1c KB82374 None Server vCenter 6.7 Any CVE-2021-21972 9.8 critical 6.7 U3l KB82374 None Server vCenter 6.5 Any CVE-2021-21972 9.8 critical 6.5 U3n KB82374 None Server Impacted Product Suites that Deploy Response Matrix 3a Components: Product Version Running CVE Identifier CVSSv3 Severity Fixed Workarounds Additional On Version Documentation Cloud Foundation 4.x Any CVE-2021-21972 9.8 critical 4.2 KB82374 None (vCenter Server) Cloud Foundation 3.x Any CVE-2021-21972 9.8 critical 3.10.1.2 KB82374 None (vCenter Server) 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 CVE Identifier CVSSv3 Severity Fixed Version Workarounds Additional On Documentation [1] 7.0 Any CVE-2021-21974 8.8 important ESXi70U1c-17325551 KB76372 None ESXi [1] 6.7 Any CVE-2021-21974 8.8 important ESXi670-202102401-SG KB76372 None ESXi [1] 6.5 Any CVE-2021-21974 8.8 important ESXi650-202102101-SG KB76372 None ESXi Impacted Product Suites that Deploy Response Matrix 3b Components: Product Version Running CVE Identifier CVSSv3 Severity Fixed Workarounds Additional On Version Documentation [1] Cloud Foundation 4.x Any CVE-2021-21974 8.8 important 4.2 KB76372 None (ESXi) [1] Cloud [2] Foundation 3.x Any CVE-2021-21974 8.8 important KB82705 KB76372 None (ESXi) 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 CVE Identifier CVSSv3 Severity Fixed Workarounds Additional On Version Documentation vCenter 7.0 Any CVE-2021-21973 5.3 moderate 7.0 U1c KB82374 None Server vCenter 6.7 Any CVE-2021-21973 5.3 moderate 6.7 U3l KB82374 None Server vCenter 6.5 Any CVE-2021-21973 5.3 moderate 6.5 U3n KB82374 None Server Impacted Product Suites that Deploy Response Matrix 3c Components: Product Version Running CVE Identifier CVSSv3 Severity Fixed Workarounds Additional On Version Documentation Cloud Foundation 4.x Any CVE-2021-21973 5.3 moderate 4.2 KB82374 None (vCenter Server) Cloud Foundation 3.x Any CVE-2021-21973 5.3 moderate 3.10.1.2 KB82374 None (vCenter Server) 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. - --------------------------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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