Headline
CVE-2023-20900: VMSA-2023-0019
VMware Tools contains a SAML token signature bypass vulnerability. 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.
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)****
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.
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.
To remediate CVE-2023-20900 apply the patches listed in the ‘Fixed Version’ column of the ‘Response Matrix’ found below.
[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.
VMware would like to thank Peter Stöckli of GitHub Security Lab for reporting this issue to us.
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****
****5. Change Log****
**2023-08-31 VMSA-2023-0019
**Initial security advisory.
****6. Contact****
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