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             AUSCERT External Security Bulletin Redistribution

                               ESB-2020.2367
 VMware Fusion, VMware Remote Console and Horizon Client updates address a
            privilege escalation vulnerability (CVE-2020-3974)
                               13 July 2020

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

Product:           VMware Fusion
                   Horizon Client
                   VMware Remote Console
Publisher:         vmware
Operating System:  Mac OS
Impact/Access:     Root Compromise -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-3974  

Original Bulletin: 
   https://www.vmware.com/security/advisories/VMSA-2020-0017.html

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Advisory ID: VMSA-2020-0017
CVSSv3 Range: 7.8
Issue Date: 2020-07-09
Updated On: 2020-07-09 (Initial Advisory)
CVE(s): CVE-2020-3974
Synopsis: VMware Fusion, VMware Remote Console and Horizon Client updates
address a privilege escalation vulnerability (CVE-2020-3974)
                         
1. Impacted Products

  o VMware Fusion Pro / Fusion (Fusion)
  o VMware Remote Console for Mac (VMRC for Mac)
  o VMware Horizon Client for Mac

2. Introduction

A privilege escalation vulnerability in VMware Fusion, VMRC for Mac and Horizon
Client for Mac was privately reported to VMware. Updates are available to
address this vulnerability.

3. XPC Client validation privilege escalation vulnerability (CVE-2020-3974)

Description

VMware Fusion, VMRC for Mac and Horizon Client for Mac contain a privilege
escalation vulnerability due to improper XPC Client validation. VMware has
evaluated the severity of this issue to be in the Important severity range with
a maximum CVSSv3 base score of 7.8.

Known Attack Vectors

Successful exploitation of this issue may allow attackers with normal user
privileges to escalate their privileges to root on the system where Fusion,
VMRC for Mac or Horizon Client for Mac is installed.

Resolution

To remediate CVE-2020-3974, apply the patches listed in the 'Fixed Version'
column of the 'Resolution Matrix' found below.

Workarounds

None.

Additional Documentation

None.

Notes

None.

Acknowledgements

VMware would like to thank Cees Elzinga of Danish Cyber Defence and Csaba
Fitzl (@theevilbit) for independently reporting this issue to us.

Response Matrix

Product Version Running CVE           CVSSv3 Severity  Fixed   Workarounds Additional
                On      Identifier                     Version             Documentation
Fusion  11.x    OS X    CVE-2020-3974 7.8    important 11.5.5  None        None
VMRC    11.x
for Mac and     OS X    CVE-2020-3974 7.8    important 11.2.0  None        None
        prior
Horizon 5.x and
Client  prior   OS X    CVE-2020-3974 7.8    important 5.4.3   None        None
for Mac

4. References

Fixed Version(s) and Release Notes:
  
VMware Fusion 11.5.5

Downloads and Documentation:

https://www.vmware.com/go/downloadfusion

https://docs.vmware.com/en/VMware-Fusion/index.html
 
VMware Horizon Client for Mac 5.4.3

Downloads and Documentation:

https://my.vmware.com/en/web/vmware/downloads/info/slug/
desktop_end_user_computing/vmware_horizon_clients/5_0

https://docs.vmware.com/en/VMware-Horizon-Client/index.html
 
VMware Remote Console for Mac 11.2.0

Downloads and Documentation:

https://my.vmware.com/en/web/vmware/downloads/details?downloadGroup=VMRC1120&
productId=974

https://docs.vmware.com/en/VMware-Remote-Console/index.html
 
Mitre CVE Dictionary Links:

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-3974

 
FIRST CVSSv3 Calculator:

https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/
I:H/A:H

5. Change Log

2020-07-09: VMSA-2020-0017 Initial security advisory.

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