Important
VMSA-2023-0019
7.5
2023-08-31
2023-08-31 (Initial Advisory)
CVE-2023-20900
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 in the virtual machine network 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
[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 | important
| None | None | ||
VMware Tools | 10.3.x | Linux | CVE-2023-20900 | important
| None | None | ||
[2] VMware Tools (open-vm-tools) | 12.x.x, 11.x.x, 10.3.x | Linux | CVE-2023-20900 | 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&productId=1259
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&productId=742
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
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