Embargo Info
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The information contained in this email is under embargo until the scheduled public disclosure on June 13th, 2023. The disclosure will be published at https://www.vmware.com/security/advisories/VMSA-2023-0013 at this time.

Description
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CVE-2023-20867: VMware Tools contains an Authentication Bypass vulnerability in the vgauth module. VMware has evaluated the severity of this issue to be in the Low severity range with a maximum CVSSv3.1 base score of 3.9 - CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N.

Known Attack Vectors
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A fully compromised ESXi host can force VMware Tools to fail to authenticate host-to-guest operations, impacting the confidentiality and integrity of the virtual machine.

Remediation
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CVE-2023-20867.zip PASSWORD: 6ljsyoo7l8qenbn4a03q

The following patches are provided for released versions of open-vm-tools:

For releases 12.2.0, 12.1.5, 12.1.0, 12.0.5, 12.0.0, 11.3.5, 11.3.0

2023-20867-Remove-some-dead-code.patch

For releases 11.1.0, 11.1.5, 11.2.0, 11.2.5

2023-20867-Remove-some-dead-code-1110-1125.patch

For releases 11.0.0, 11.0.5

2023-20867-Remove-some-dead-code-1100-1105.patch

For releases 10.3.0, 10.3.5, 10.3.10

2023-20867-Remove-some-dead-code-1030-10310.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.
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