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Date: Fri, 27 Oct 2023 03:43:27 +0000
From: VMware Security Response Center <>
To: "" <>
Subject: CVE-2023-34058 - SAML Token Signature Bypass in open-vm-tools



CVE-2023-34058: open-vm-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 - CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Known Attack Vectors


A malicious actor that has been granted Guest Operation Privileges in a target virtual machine may be able to elevate their privileges if that target virtual machine has been assigned a more privileged Guest Alias.



Please note that while the description and known attack vectors are very similar to CVE-2023-20900, CVE-2023-34058 has a different root cause that must be addressed.



The following patch is provided for all open-vm-tools releases 11.0.0 through 12.3.0

The patches have been tested against the above open-vm-tools releases.  Each applies cleanly with:

git am for a git repository.

patch -p2 in the top directory of an open-vm-tools source tree.


Edward Hawkins

Staff-2 Technical Program Manager<>

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