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             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.3849
         VMSA-2021-2025 - VMware vCenter Server updates address a
            privilege escalation vulnerability (CVE-2021-22048)
                             11 November 2021

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           VMware vCenter Server
                   VMware Cloud Foundation
Publisher:         VMWare
Operating System:  Windows
                   Virtualisation
                   VMware ESX Server
Impact/Access:     Increased Privileges -- Existing Account
Resolution:        Mitigation
CVE Names:         CVE-2021-22048  

Original Bulletin: 
   https://www.vmware.com/security/advisories/VMSA-2021-0025.html

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Advisory ID: VMSA-2021-0025
CVSSv3 Range: 7.1
Issue Date: 2021-11-10
Updated On: 2021-11-10 (Initial Advisory)
CVE(s): CVE-2021-22048
Synopsis: VMware vCenter Server updates address a privilege escalation
vulnerability (CVE-2021-22048)


1. Impacted Products

  o VMware vCenter Server (vCenter Server)
  o VMware Cloud Foundation (Cloud Foundation)

2. Introduction

A privilege escalation vulnerability in VMware Center Server was privately
reported to VMware. Workarounds are available to remediate this vulnerability
in the affected VMware products.

3. VMware vCenter Server IWA privilege escalation vulnerability
(CVE-2021-22048)

Description

The vCenter Server contains a privilege escalation vulnerability in the IWA
(Integrated Windows Authentication) authentication mechanism. VMware has
evaluated the severity of this issue to be in the Important severity range with
a maximum CVSSv3 base score of 7.1.

Known Attack Vectors

A malicious actor with non-administrative access to vCenter Server may exploit
this issue to elevate privileges to a higher privileged group. 

Resolution

None.

Workarounds

Workaround for CVE-2021-22048 is to switch to AD over LDAPS authentication/
Identity Provider Federation for AD FS (vSphere 7.0 only) from Integrated
Windows Authentication (IWA) as documented in the KB listed in the
'Workarounds' column of the 'Response Matrix' below.

Additional Documentation

None.

Notes

None.

Acknowledgements

VMware would like to thank Yaron Zinar and Sagi Sheinfeld of Crowdstrike 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-2021-22048 7.1    important Patch   KB86292     None
Server                                                  pending
vCenter 6.7     Any     CVE-2021-22048 7.1    important Patch   KB86292     None
Server                                                  Pending

Impacted Product Suites that Deploy Response Matrix Components:

Product    Version Running CVE Identifier CVSSv3 Severity  Fixed   Workarounds Additional
                   On                                      Version             Documentation
Cloud
Foundation 4.x     Any     CVE-2021-22048 7.1    important Patch   KB86292     None
(vCenter                                                   pending
Server)
Cloud
Foundation 3.x     Any     CVE-2021-22048 7.1    important Patch   KB86292     None
(vCenter                                                   Pending
Server)

4. References

KB86292
https://kb.vmware.com/s/article/86292

Mitre CVE Dictionary Links:
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-22048

FIRST CVSSv3 Calculator:
CVE-2021-22048: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:A/AC:H/
PR:L/UI:N/S:U/C:H/I:H/A:H

5. Change Log

2021-11-10 VMSA-2021-0025
Initial security advisory.

6. Contact

E-mail list for product security notifications and announcements:

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

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