Operating System:

[Win]

Published:

16 January 2020

Protect yourself against future threats.

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2020.0173
                  VMWare Tools for Windows vulnerability
                              16 January 2020

===========================================================================

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

Product:           VMWare Tools for Windows
Publisher:         VMWare
Operating System:  Windows
Impact/Access:     Increased Privileges -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-3941  

Original Bulletin: 
   https://www.vmware.com/security/advisories/VMSA-2020-0002.html

- --------------------------BEGIN INCLUDED TEXT--------------------

+------------+----------------------------------------------------------------+
|Advisory ID |VMSA-2020-0002                                                  |
+------------+----------------------------------------------------------------+
|Advisory    |Important                                                       |
|Severity    |                                                                |
+------------+----------------------------------------------------------------+
|CVSSv3 Range|7.8                                                             |
+------------+----------------------------------------------------------------+
|Synopsis    |VMware Tools workaround addresses a local privilege escalation  |
|            |vulnerability (CVE-2020-3941)                                   |
+------------+----------------------------------------------------------------+
|Issue Date  |2020-01-14                                                      |
+------------+----------------------------------------------------------------+
|Updated On  |2020-01-14 (Initial Advisory)                                   |
+------------+----------------------------------------------------------------+
|CVE(s)      |CVE-2020-3941                                                   |
+------------+----------------------------------------------------------------+

1. Impacted Products

  o VMware Tools for Windows (VMware Tools)

2. Introduction

A vulnerability in VMware Tools in functionality that was removed from VMware
Tools 11.0.0 has been determined to affect VMware Tools for Windows version
10.x.y. Workarounds are available to address this vulnerability in affected
VMware Tools versions.

3. VMware Tools workaround addresses a local privilege escalation vulnerability
(CVE-2020-3941)

Description:
The repair operation of VMware Tools for Windows has a race condition. 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:
A malicious actor on the guest VM might exploit the race condition and escalate
their privileges on a Windows VM. This issue affects VMware Tools for Windows
version 10.x.y as the affected functionality is not present in VMware Tools 11.


Resolution:
To remediate CVE-2020-3941, update to VMware Tools version 11.0 or later.
 

Workarounds:
A workaround for CVE-2020-3941 has been documented in the VMware Knowledge Base
article listed in the "Workarounds" column of the "Response Matrix" below.


Additional Documentations:
None.

 
Acknowledgements:
None.

Response Matrix:
+-------+-------+-------+-------------+------+---------+--------+-----------+-------------+
|Product|Version|Running|CVE          |CVSSV3|Severity |Fixed   |Workarounds|Additional   |
|       |       |On     |Identifier   |      |         |Version |           |Documentation|
+-------+-------+-------+-------------+------+---------+--------+-----------+-------------+
|VMware |11.x.y |Any    |CVE-2020-3941|N/A   |N/A      |Not     |N/A        |N/A          |
|Tools  |       |       |             |      |         |affected|           |             |
+-------+-------+-------+-------------+------+---------+--------+-----------+-------------+
|       |       |       |             |      |         |11.0.0 *|           |             |
|VMware |       |       |             |      |         |or      |           |             |
|Tools  |10.x.y |Windows|CVE-2020-3941|7.8   |Important|11.0.1  |KB76654    |None         |
|       |       |       |             |      |         |or      |           |             |
|       |       |       |             |      |         |11.0.5  |           |             |
+-------+-------+-------+-------------+------+---------+--------+-----------+-------------+
|VMware |10.x.y |Linux  |CVE-2020-3941|N/A   |N/A      |Not     |N/A        |N/A          |
|Tools  |       |       |             |      |         |affected|           |             |
+-------+-------+-------+-------------+------+---------+--------+-----------+-------------+

* In case you are using the native service discovery feature in vRealize
Operations Manager 8.0, or using the vRealize Operations Service Discovery
Management Pack with previous releases of vRealize Operations Manager (7.x or
before) we recommend upgrading to VMware Tools 11.0.1 or 11.0.5.

4. References
Fixed Version(s) and Release Notes:
https://docs.vmware.com/en/VMware-Tools/11.0/rn/
VMware-Tools-1105-Release-Notes.html

Workarounds:
https://kb.vmware.com/s/article/76654

FIRST CVSSv3 Calculator:
CVE-2020-3941 - https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:L/AC:L/
PR:L/UI:N/S:U/C:H/I:H/A:H

Mitre CVE Dictionary Links:
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-3941

5. Change log
2020-01-14 : VMSA-2020-0002

Initial security advisory in conjunction with the release of VMware Tools
11.0.5 on 2020-01-14

6. Contact

E-mail list for product security notifications and announcements:
https://lists.vmware.com/cgi-bin/mailman/listinfo/security-announce

This Security Advisory is posted to the following lists:

  security-announce@lists.vmware.com

E-mail: security@vmware.com

PGP key at:
https://kb.vmware.com/kb/1055

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