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Date: Mon, 16 Oct 2023 10:03:13 -0400
From: Demi Marie Obenour <demi@...isiblethingslab.com>
To: oss-security@...ts.openwall.com
Cc: VMware Security Response Center <security@...are.com>
Subject: Re: CVE-2023-20867: open-vm-tools: Authentication
Bypass vulnerability in the vgauth module
On Mon, Oct 16, 2023 at 03:48:14AM +0200, Solar Designer wrote:
> Hi,
>
> This was brought to linux-distros on June 6 with "scheduled public
> disclosure on June 13th, 2023." There's a VMware security advisory that
> says it was published on that date:
>
> https://www.vmware.com/security/advisories/VMSA-2023-0013.html
>
> and patches are available at:
>
> https://github.com/vmware/open-vm-tools/tree/CVE-2023-20867.patch
>
> but the issue was wrongly never brought to oss-security (or at least I
> couldn't find it) - so I am correcting this now.
>
> Quoting from the linux-distros message:
>
> > Description
> > ==============================================================
> > 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
> > ==============================================================
> > 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.
>
> Quoting from the GitHub URL above:
>
> > The issue has been fixed in the open-vm-tools version 12.2.5 released on
> > June 13, 2023.
> >
> > The following patch provided to the open-vm-tools community can be used
> > to apply the security fix to previous open-vm-tools releases.
> >
> > 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.
>
> Alexander
How is this a vulnerability at all? A compromised ESXi host can
compromise the guest already, unless confidential computing technologies
are in use.
--
Sincerely,
Demi Marie Obenour (she/her/hers)
Invisible Things Lab
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