oss-security - [Security Advisory] open-vm-tools: SAML token signature bypass vulnerability (CVE-2023-20900)

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Date: Thu, 31 Aug 2023 09:26:26 +0000
From: VMware Security Response Center <security@...are.com>
To: "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com>
Subject: [Security Advisory] open-vm-tools: SAML token signature bypass
 vulnerability (CVE-2023-20900)

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Please see the security advisory here: https://www.vmware.com/security/advisories/VMSA-2023-0019.html 

Description
==============================================================
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 CVSSv3.1 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 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.

Upstream fix for CVE-2023-20900
==============================================================
https://github.com/vmware/open-vm-tools/blob/CVE-2023-20900.patch/CVE-2023-20900.patch
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