===================================================================                                CERT-Renater

                      Note d'Information No. 2023/VULN277

_____________________________________________________________________

DATE                : 31/08/2023

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S): Systems running VMware Tools versions prior to
                                 12.3.0, 10.3.26.

====================================================================https://www.vmware.com/security/advisories/VMSA-2023-0019.html
_____________________________________________________________________

Important
Advisory ID:      VMSA-2023-0019
CVSSv3 Range:     7.5
Issue Date:       2023-08-31
Updated On:       2023-08-31 (Initial Advisory)
CVE(s):           CVE-2023-20900
Synopsis:
VMware Tools updates address a SAML Token Signature Bypass
Vulnerability (CVE-2023-20900)


1. Impacted Products

     VMware Tools


2. Introduction

A SAML token signature bypass vulnerability in VMware Tools was
responsibly reported to VMware. Updates are available to remediate
this vulnerability in the affected VMware products.


3. SAML Token Signature Bypass vulnerability (CVE-2023-20900)

Description

VMware Tools contains a SAML token signature bypass vulnerability.
VMware has evaluated the severity of this issue to be in the
Important severity range with a maximum CVSSv3 base score of 7.5.

Known Attack Vectors

A malicious actor with man-in-the-middle (MITM) network positioning
between vCenter server and the virtual machine may be able to
bypass SAML token signature verification, to perform VMware Tools
Guest Operations.

Resolution

To remediate CVE-2023-20900 apply the patches listed in the 'Fixed
Version' column of the 'Response Matrix' found below.

Workarounds

None.

Additional Documentation

None.

Notes

[1] VMware Tools 10.3.26 only applies to the older Linux releases.
[2] A version of open-vm-tools that addresses CVE-2023-20900 will be
distributed by Linux vendors. [3] Fixed versions may differ based on the 
Linux distribution version
and the distribution vendor.

Acknowledgements

  VMware would like to thank Peter Stöckli of GitHub Security Lab for
reporting this issue to us.


Response Matrix

Product    Version    Running On    CVE Identifier   CVSSv3    Severity
Fixed Version     Workarounds     Additional Documentation

VMware Tools    12.x.x, 11.x.x, 10.3.x    Windows    CVE-2023-20900
7.5    important    12.3.0    None    None

VMware Tools    10.3.x    Linux    CVE-2023-20900    7.5   important
[1] 10.3.26    None    None

[2] VMware Tools (open-vm-tools)    12.x.x, 11.x.x, 10.3.x    Linux
CVE-2023-20900    7.5    important    [3] 12.3.0    None    None


4. References

Fixed Version(s) and Release Notes:

VMware Tools for Windows 12.3.0
Downloads and Documentation:
https://customerconnect.vmware.com/downloads/details?downloadGroup=VMTOOLS1230&productId59
https://docs.vmware.com/en/VMware-Tools/12.3/rn/vmware-tools-1230-release-notes/index.html

VMware Tools for Linux 10.3.26
Downloads and Documentation:
https://customerconnect.vmware.com/downloads/details?downloadGroup=VMTOOLS10326&productIdt2
https://docs.vmware.com/en/VMware-Tools/10.3/rn/vmware-tools-10326-release-notes/index.html

Mitre CVE Dictionary Links:
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-20900

FIRST CVSSv3 Calculator:
CVE-2023-20900: 
https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H


5. Change Log

2023-08-31 VMSA-2023-0019
Initial security advisory.

  6. Contact

E-mail: security@vmware.com

PGP key at:
https://kb.vmware.com/kb/1055
VMware Security Advisories
https://www.vmware.com/security/advisories
VMware Security Response Policy
https://www.vmware.com/support/policies/security_response.html
VMware Lifecycle Support Phases
https://www.vmware.com/support/policies/lifecycle.html
VMware Security & Compliance Blog  https://blogs.vmware.com/security
Twitter
https://twitter.com/VMwareSRC

Copyright 2023 VMware Inc. All rights reserved.


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