CVE-2023-34058 - SAML Token Signature Bypass in open-vm-tools

[VMware Security Response Center <security () vmware com>]

Description

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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

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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.



Notes

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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.



Remediation

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



https://github.com/vmware/open-vm-tools/blob/CVE-2023-34058.patch/CVE-2023-34058.patch


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

security () vmware com<mailto:security () vmware com>